Research Methods in Clinical Linguistics and Phonetics E-Book

• Herausgeber: John Wiley & Sons
• Kategorie: Geisteswissenschaft
• Serie: GMLZ - Guides to Research Methods in Language and Linguistics
• Sprache: Englisch

Seitenzahl: 647

Veröffentlichungsjahr: 2013

Beschreibung

Research Methods in Clinical Linguistics and Phonetics

GUIDES TO RESEARCH METHODS IN LANGUAGE AND LINGUISTICS

“Up to date and covering a refreshingly wide range of approaches, this is a first-rate guide and resource for both practitioners and consumers of research in clinical linguistics and phonetics.”
Mick Perkins, University of Sheffield

“This truly outstanding collection of readings, treating a number of critical issues with great clarity, is certain to be quickly recognized as a valuable resource by the community of researchers.”
Martin R. Gitterman, The City University of New York

Research Methods in Clinical Linguistics and Phonetics introduces a wide range of research philosophies, methods, and tools used across linguistics, phonetics, and speech science, as applied to disordered speech and language. Comprised of sixteen chapters, each authored by specialists representing a variety of approaches, the volume addresses core topics for students `undertaking their own research, including:

• experimental and quasi-experimental methods
• qualitative methods, including ethnography and conversation analysis
• sociolinguistics
• corpus construction and analysis
• data recording, transcription, and digital analysis of speech

In addition to exploring these and other topics, the volume considers the research ethics associated with working with those who have speech or other communication difficulties. There is a detailed discussion of the dissemination of research results in the form of theses, dissertations, and journal articles, and of the peer review process. Chapters include summary boxes to highlight salient information, and resources for researchers such as relevant web archives and tools. It offers students and researchers from a variety of entry points – such as linguistics, education, psychology, and speech pathology – an introduction to the scope of research in clinical linguistics and phonetics, and a practical guide to this interdisciplinary field.

Leseprobe

Contents

Notes on Contributors

1 Linguistics, Phonetics, and Speech-Language Pathology: Clinical Linguistics and Phonetics

1.1 A Brief Historical Overview of Clinical Linguistics and Phonetics

1.2 The Role of Clinical Linguistics and Phonetics in Speech-Language Pathology

1.3 Research Philosophies, and the Rest of this Book

2 Research Ethics

2.1 Introduction

2.2 Basic Concepts

2.3 Planning for Ethical Research

2.4 Conducting Research Ethically

2.5 Disseminating Results Ethically

2.6 Emerging Trends

2.7 Conclusion

2.8 Resources

3 Experimental and Quasi-experimental Research in Clinical Linguistics and Phonetics

3.1 Introduction

3.2 Research Design

3.3 General Discussion

3.4 Resources

4 The Investigation of Speech Production: Experimental and Quasi-experimental Approaches

4.1 Overview of Speech Difficulties: Theoretical Underpinnings

4.2 Data Collection Considerations

4.3 Perceptual Evaluation Methods

4.4 Technology and Speech Production Studies

4.5 Beyond Speech

4.6 Conclusion

4.7 Resources

5 Investigating Disordered Language: Experimental and Quasi-experimental Approaches

5.1 Overview of Territory

5.2 Focusing the Research Question

5.3 Overview of Language Disorders: Theoretical Underpinnings and the Nature of Data

5.4 Experimental (and Quasi-experimental) Methods: Examples of Contributions to Nosology

5.5 Experimental Research and Language Intervention

5.6 Data Collection Considerations

5.7 Microgenetic Research: An Underused Research Tool

5.8 Conclusion

5.9 Resources

6 Qualitative Research in Clinical Linguistics and Phonetics

6.1 Definitions

6.2 Traditions of Inquiry

6.3 Case-Based Research and Qualitative Case Studies

6.4 Preparing the Ground: Finding a Question, Preparing a Study, and Finding Participants

6.5 Data Types and Data Sources: A Brief Selection

6.6 Working with Data: Analysis and Interpretation

6.7 Conclusion and Outlook

6.8 Resources

7 An Ethnographic Approach to Assessing Communication Success in Interactions Involving Adults with Developmental Delay

7.1 Introduction

7.2 Culture and Context: Situating Interactions

7.3 The Role of Ethnography in Investigating Speech and Language Disorders

7.4 Ethnography of Communication

7.5 Applying the Typology

7.6 Summary and Conclusion

7.7 Recommended Reading and Resources

8 Conversation Analysis Applied to Disordered Speech and Language

8.1 Introduction

8.2 Development and Principles

8.3 Organizing Talk-in-Interaction

8.4 Communication Disorders and CA

8.5 Motivations and Future Research

8.6 Resources

Appendix 8.A Transcription Conventions

Appendix 8.B

9 Clinical Sociolinguistics

9.1 Introduction

9.2 Basic Concepts

9.3 Collecting Data

9.4 Data Analysis

9.5 Clinical Sociolinguistics

9.6 Resources

10 The Recording of Audio and Video Data

10.1 Introduction

10.2 Audio and Video Data: Purpose and Method

10.3 Audio Recording

10.4 Video Recording

10.5 Data Storage and Protection

10.6 Conclusion

11 Data Processing: Transcriptional and Impressionistic Methods

11.1 Introduction

11.2 Transcribing Speech

11.3 Transcribing Linguistic Interaction

11.4 Conclusion and Outlook: Why do We Transcribe, and What is a Transcript?

11.5 Resources

Appendices

12 Data Processing: Digital Analysis of Speech Audio Signals

12.1 Introduction

12.2 Representations

12.3 Analysis

12.4 Modeling

12.5 Resources

13 Data Processing: Imaging of Speech Data

13.1 The Background to Speech Imaging

13.2 What is Speech Imaging? Parameters for Analysis

13.3 Neuroimagery: Charting Brain Activity in Speech Production

13.4 Imaging the Lower Vocal Tract

13.5 Larynx Imaging

13.6 Imaging Nasal and Oral Airflow

13.7 Imaging the Tongue

13.8 Multipurpose Analysis: The Visi-Pitch

13.9 Conclusion

13.10 Resources

14 Data Analysis and Interpretation: Statistical Methods

14.1 Doing Statistics: Probability, Hypothesis Testing, Type I Error, Type II Error

14.2 Units of Statistical Analysis: Variables

14.3 Descriptive Statistics

14.4 Skewed Distributions, Outliers, and Data Trimming

14.5 Parametric and Non-parametric Statistics

14.6 “Doing Stats”: Available Software

14.7 Conclusion

15 AphasiaBank: Data and Methods

15.1 Introduction

15.2 AphasiaBank

15.3 Goals

15.4 Protocol Standardization

15.5 Transcribing

15.6 Error Coding

15.7 Analyses

15.8 Syndrome Classification

15.9 Content Analysis

15.10 Profiles of Recovery Processes

15.11 Conclusion

16 Disseminating Research: Reading, Writing, and Publishing

16.1 Introduction

16.2 Finding and Reading Literature

16.3 Writing Up Research

16.4 Publishing Research

Acknowledgments

Index

Guides to Research Methods in Language and Linguistics

Series Editor: Li Wei, Birkbeck College, University of LondonThe science of language encompasses a truly interdisciplinary field of research, with a wide range of focuses, approaches, and objectives. While linguistics has its own traditional approaches, a variety of other intellectual disciplines have contributed methodological perspectives that enrich the field as a whole. As a result, linguistics now draws on state-of-the-art work from such fields as psychology, computer science, biology, neuroscience and cognitive science, sociology, music, philosophy, and anthropology.

The interdisciplinary nature of the field presents both challenges and opportunities to students who must understand a variety of evolving research skills and methods. The Guides to Research Methods in Language and Linguistics addresses these skills in a systematic way for advanced students and beginning researchers in language science. The books in this series focus especially on the relationships between theory, methods and data – the understanding of which is fundamental to the successful completion of research projects and the advancement of knowledge.

Published

1. The Blackwell Guide to Research Methods in Bilingualism and Multilingualism    Edited by Li Wei and Melissa G. Moyer

2. Research Methods in Child Language: A Practical Guide    Edited by Erika Hoff

3. Research Methods in Second Language Acquisition: A Practical Guide    Edited by Susan M. Gass and Alison Mackey

4. Research Methods in Clinical Linguistics and Phonetics: A Practical Guide    Edited by Nicole Müller and Martin J. Ball

Forthcoming

Research Methods in Sociolinguistics: A Practical GuideEdited by Janet Holmes and Kirk HazenResearch Methods in Sign Language Studies: A Practical GuideEdited by Eleni Orfanidou, Bencie Woll, and Gary MorganResearch Methods in Language Policy and Planning: A Practical GuideEdited by Francis Hult and David Cassels Johnson

This edition first published 2013© 2013 Blackwell Publishing Ltd

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Library of Congress Cataloging-in-Publication Data

Research methods in clinical linguistics and phonetics: a practical guide / edited by Nicole Müller and Martin J. Ball. p. cm.Includes bibliographical references and index.

ISBN 978-1-4443-3583-5 (cloth) – ISBN 978-1-4443-3584-2 (pbk.)1. Speech disorders. 2. Communicative disorders. 3. Language disorders. 4. Phonetics. 5. Applied linguistics. I. Müller, Nicole, 1963– II. Ball, Martin J. (Martin John)RC423.R455 2013616.85′5–dc23

2012010361

A catalogue record for this book is available from the British Library.

Cover image: Goreme National Park, Turkey © Carson Ganci/Design Pics/CorbisCover design by www.cyandesign.co.uk

Notes on Contributors

Marcy Adler-Bock is a speech-language pathologist who works with preschool children with communication difficulties in Vancouver, British Columbia. She completed her BA at Simon Fraser University and her MS at the University of British Columbia. She has collaborated on various research projects within the School of Audiology and Speech Sciences at the University of British Columbia since 2004, in particular, with use of ultrasound. Her Master’s thesis was an ultrasound treatment study with two adolescents who had difficulty with /r/.Penelope Bacsfalvi is an instructor for Linguistics and Audiology and Speech Sciences at the University of British Columbia. She received her PhD in 2007 on the use of visual feedback in speech habilitation. She is a speech-language pathologist and researcher at the Provincial Resource Programme for Auditory Outreach (PRP-AO). Her clinical work focuses on hearing loss in children, cochlear implants, visual feedback technology, and a team approach to auditory verbal intervention. Her research continues on visual feedback in speech habilitation.Martin J. Ball is Hawthorne-BoRSF Endowed Professor at the University of Louisiana at Lafayette. He is co-editor of the journal Clinical Linguistics and Phonetics (Taylor & Francis), and the book series Communication Disorders across Languages (Multilingual Matters). His main research interests include sociolinguistics, clinical phonetics and phonology, and the linguistics of Welsh. He is an honorary Fellow of the Royal College of Speech and Language Therapists, and a Fellow of the Royal Society of Arts. Among his recent books are Handbook of Clinical Linguistics (co-edited with M. Perkins, N. Müller, and S. Howard, Wiley-Blackwell, 2008), and Phonology for Communication Disorders (co-authored with N. Müller and B. Rutter, Psychology Press, 2010).Scott Barnes is a speech-language pathologist and postdoctoral research fellow with the Centre for Clinical Research Excellence in Aphasia Rehabilitation, based at the University of Sydney. His doctoral dissertation examined topic talk during everyday interactions involving a person with aphasia, and was undertaken via Macquarie University, Sydney. He is currently using CA to investigate everyday interactions involving people with acquired communication disorders.B. May Bernhardt has been a speech-language pathologist since 1972 and on ­faculty at the School of Audiology and Speech Sciences, University of British Columbia, since 1990. Her main focus has been phonological and other language development, assessment and intervention, with application of nonlinear phonology and use of visual feedback in intervention. She was awarded Honours of the BCASLPA Association in 2006 for her collaborative research projects involving practitioners in ­British Columbia. Recently, her interest in collaboration has led to two final career projects: (1) speech, language and hearing support for First Nations, Métis and Inuit people in Canada and (2) crosslinguistic investigation of phonological development.Stuart Cunningham is a Lecturer in the Department of Human Communication Sciences at the University of Sheffield. He has a PhD in computer science and his primary research interests are in robust automatic speech recognition and the application of speech technology in the field of assistive technology. He has recently led work on the development of new approaches to the automatic recognition of dysarthric speech. Dr Cunningham has also conducted research into ways of producing personalized synthetic voices for people with speech disorders for use in voice output communication aids.Paula S. Currie is an Associate Professor and the Assistant Dean of the College of Nursing and Health Sciences at Southeastern Louisiana University. She received her BA from Louisiana State University; her Master of Communication ­Disorders from the Louisiana State University Medical Center in New Orleans; her PhD from the University of New Orleans. She has worked as a speech-language pathologist in a variety of settings including public schools, private practice, and ­universities. Her areas of interest include administration, assessment of communication disorders, and intervention for people with complex communication ­disorders.Alison Ferguson is Professor of Speech Pathology at the University of Newcastle, Australia. Her main research interests are in the application of linguistics to the assessment of people with aphasia and to understanding the processes of therapy for aphasia.Margaret Forbes studied English at Randolph College (BA) and Carnegie Mellon University (MA) and received her training in Communication Sciences and Disorders at the University of North Carolina at Chapel Hill and the University of Pittsburgh (MA). She treated adults with cognitive and communication disorders at the University of Pittsburgh Medical Center hospitals for 10 years. She has been involved in communication disorders research at the Alzheimer Disease Research Center of the University of Pittsburgh, Western Psychiatric Institute and Clinic, and Carnegie Mellon University, where she is currently a research faculty member working on the AphasiaBank project directed by Brian MacWhinney. Her research interest is neurogenic communication disorders in adults.Davida Fromm did her training in speech-language pathology at the University of Michigan (BA), the University of Wisconsin (MS), and the University of Pittsburgh (PhD). Between 1990 and 2007, she taught courses in Communication Science and Disorders at the University of Pittsburgh and Duquesne University. In 1999, Dr Fromm co-authored the revised Communicative Abilities in Daily Living (CADL-2) test with Audrey Holland and Carol Frattali. Currently, she is a Research Faculty member at Carnegie Mellon University in the Department of Psychology. Her research interests have focused on adults with acquired neurogenic communicative disorders.Angela Granese is a doctoral student in the Applied Language and Speech Sciences program at the University of Louisiana at Lafayette. She received a BA in Mass Communication from the University of South Florida in 2006. She is in the process of earning the Certificate of Clinical Competence in Speech-Language Pathology (CCC-SLP). Her research interests include clinical phonetics and phonology, bilingualism, and autism.Jacqueline Guendouzi is a clinical linguist who received her PhD from Cardiff University. Currently she is a Professor in the Communication Sciences and Disorders department at Southeastern Louisiana University. Her research interests include psycholinguistics and discourse analysis. Her publications include: J. Guendouzi and N. Müller (2006) Approaches to Discourse in Dementia, Lawrence Erlbaum Associates; J. Guendouzi, F. Loncke, and M. Williams (2011) Handbook of Psycholinguistics and Cognitive Processes: Perspectives in Communication Disorders, Psychology Press.Audrey Holland is Regents’ Professor Emerita of Speech and Hearing Sciences at the University of Arizona. Her areas of expertise include working with adults who have aphasia and other neurologic communication disorders, aspects of aging, and counseling individuals with disabilities. She has served on the Advisory Council for the US National Institute on Deafness and other Communication Disorders (NIH), the Secretary’s Advisory Committee on Prosthetics and Special Disabilities, US Department of Veterans Affairs, and was a member of the Advisory Committee of the National Center for Medical Rehabilitation Research. She is a recipient of the Honors of the American Speech-Language-Hearing Association. She also received the Clinical Achievement Award from the Academy of Neurologic Communication Disorders and Sciences, and the Professional Achievement Award from the Council of Graduate Programs in Communication Sciences and Disorders.Sara Howard is Professor in Clinical Phonetics in the Department of Human Communication Sciences at the University of Sheffield and an ESRC Research Fellow. As well as degrees in phonetics and linguistics, she has a professional qualification as a speech-language therapist. Her research interests span clinical phonetics and pho­nology (with a particular interest in phonetic transcription and electropalatography) and developmental speech disorders, including cleft palate. Her most recent books areCleft Palate Speech: Assessment and Intervention (Wiley-Blackwell, 2011), co-edited with Anette Lohmander, andThe Handbook of Clinical Linguistics (Wiley-Blackwell, 2008), co-edited with Martin Ball, Mick Perkins, and Nicole Müller. She is currently President of the International Clinical Phonetics and Linguistics Association.Mark Huckvale is Senior Lecturer in Speech Sciences in the Division of Psychology and Language Sciences at University College London. He has a degree in physics from Warwick University, and a PhD in human communication from the University of London. He has over 25 years of experience in research and teaching in speech and hearing sciences. His research activities have included speech recognition, speech synthesis, and speech signal processing. He is the main author of the Speech Filing System toolkit for speech analysis and is a recipient of the Provost’s Teaching Award for his contributions to phonetics teaching at UCL.Louise Keegan is Assistant Professor in Communication Sciences and Disorders at Appalachian State University, North Carolina. She is originally from Limerick, Ireland, and graduated as a speech and language therapist from University College Cork. She completed her PhD in applied language and speech sciences in the University of Louisiana at Lafayette in 2012. Her research interests lie in the social use of language especially in populations with acquired language disorders, and her PhD dissertation focused on the linguistic construction of identity in individuals with traumatic brain injury.Sharynne McLeod is Professor of Speech and Language Acquisition at Charles Sturt University in Australia. She is editor of the International Journal of Speech-Language Pathology, vice president of the International Clinical Linguistics and Phonetics Association, and a Fellow of both the American Speech-Language-Hearing Association and Speech Pathology Australia. She has been received national awards for her teaching and research. Recent co-authored and co-edited books include The International Guide to Speech Acquisition, Speech Sounds, Interventions for Speech Sound Disorders in Children, and Multilingual Aspects of Speech Sound Disorders in Children.Brian MacWhinney, Professor of Psychology, Computational Linguistics, and Modern Languages at Carnegie Mellon University, has developed a model of first and second language acquisition and processing called the Competition Model which he has also applied to aphasia and fMRI studies of children with focal lesions. He has also developed the CHILDES project for the computational study of child language transcript data, the TalkBank system for the study of conversational interactions, AphasiaBank for the study of aphasia, and the E-Prime and PsyScope programs.Vesna Mildner is a Professor and Chair of Applied Phonetics at the Faculty of Humanities and Social Sciences, University of Zagreb. Her research and teaching areas of interest are neurophonetics, bilingualism, speech perception, speech acquisition, and clinical phonetics. She is the author of two books and dozens of peer-reviewed articles and chapters and has edited a number of books, proceedings, and journal special issues; she is editor-in-chief of the journal Govor and on the editorial board of several journals. She has organized more than 20 conferences and presented invited talks and courses in Austria, Brazil, China, Croatia, France, Hungary, Italy, and Slovenia. Mildner is active on several research projects and is a member of IPA, IASCL and ICPLA.Geetanjalee Modha is a speech-language pathologist with the Acquired Brain Injury program at GF Strong Rehabilitation Centre in Vancouver. She has also worked with preschool children and at the Provincial Autism Resource Centre. She is a clinical educator and has instructed a course in phonology and labs at UBC. Her Master’s research was a case study of a teenager with /r/ challenges and providing treatment using ultrasound. She is currently involved in a study at GF Strong to explore communication strategies in stroke.Nicole Müller is a Professor of Communicative Disorders at the University of ­Louisiana at Lafayette, and holds a Hawthorne-BoRSF Endowed Professorship. Among her teaching and research interests are phonetics and speech output disorders, as well as Systemic Functional Linguistics and its applications to various data genres in the context of communicative disorders, such as conversation in dementia and traumatic brain injury. She also co-edits the journalClinical Linguistics and Phoneticsand the book series Communication Disorders across Languages.Judith D. Oxley is a speech-language pathologist and Assistant Professor at the University of Louisiana at Lafayette. Her current clinical and research interests include language and speech development in children who use augmentative and alternative communication, cognitive demands of using alternative communication modalities for adults following traumatic brain injury, and the emergence of metastrategic insight into clinical practice in preprofessional speech-language pathology students.Thomas W. Powell is Professor of Rehabilitation Sciences in the School of Allied Health Professions at the Louisiana State University Health Sciences Center – Shreveport, USA. His research interests include clinical phonetics and phonology, measurement, and ethics. Dr Powell is co-editor of Clinical Linguistics and Phonetics, the official journal of the International Clinical Phonetics and Linguistics Association. He edited, with Martin Ball, a four-volume compendium entitled Clinical Linguistics, part of the Critical Concepts in Linguistics series published by Routledge. He also co-authored Ethics for Speech-Language Pathologists: An Illustrative Casebook.Barbara Purves is an Assistant Professor in the School of Audiology and Speech Sciences at the University of British Columbia (UBC). She received a PhD in Interdisciplinary Studies in 2006 at UBC and has over 25 years’ clinical experience working as a speech-language pathologist with people with acquired communication disorders. Concerning speech communication, she has researched the area of comprehensibility in adult dyads. A recent Aphasia Mentoring Project involved people with aphasia providing information and learning opportunities for students from a variety of disciplines.Joan Rahilly is Senior Lecturer in Phonetics and Linguistics at Queen’s University, Belfast, Northern Ireland. Her research interests are wide ranging, and include segmental and suprasegmental aspects of speech variability in Irish English, speech acquisition, and clinical linguistics. Her publications in all of these areas are united by a particular focus on the interactive effects of speech and language variation and breakdown within and between speech communities.Eleonora Rossi received her Master’s and PhD from the Linguistic Department at the University of Groningen (the Netherlands). Her dissertation focused on investigating morpho-syntactic disorders in speakers with agrammatic aphasia and in bilingual aphasic speakers. She is currently working within the Center for Language Science – CLS – as a post-doctoral research associate at Pennsylvania State University, where she is investigating bilingual language processing in healthy populations utilizing behavioral and neuroimaging methods, such as eye-tracking, Event-Related Potentials (ERPs), and functional Magnetic Resonance Imaging (fMRI).Ben Rutter is a university teacher in the Department of Human Communication Sciences at the University of Sheffield. His research interests focus on the application of phonetics and phonology to the study of speech and language disorders. He has published research adapting methods in acoustic phonetics to the study of dysarthria, progressive speech degeneration, and phonological acquisition. He holds a PhD in clinical linguistics from the University of Louisiana at Lafayette.

1    Linguistics, Phonetics, and Speech-Language Pathology: Clinical Linguistics and Phonetics

Nicole Müller and Martin J. Ball

1.1 A Brief Historical Overview of Clinical Linguistics and Phonetics

The speech-language sciences and arts have, of course, informed speech-language pathology for a long time; for example, the knowledge of normal articulation was imported from phonetics, the use of terms for word classes (such as nouns and verbs) from traditional grammar. However, the more recent close interaction between ­linguistics and communication disorders started only in the 1970s. Kent (2011), in a review of the development of the journal Clinical Linguistics and Phonetics, points to Duchan’s online survey of the development of speech-language pathology, where she refers to the period from 1965 to 1975 as the “linguistic era” (see Duchan, 2011).

In the 1970s and 1980s David Crystal and his colleagues developed linguisti­cally based profiling techniques for the analysis of normal and disordered syntax and morphology (Crystal, 1979; Crystal, Fletcher, and Garman, 1976), and then phonology, prosody, and semantics (Crystal, 1982). At the same time an interest in the clinical application of modern phonological theory began to emerge, with publications by Grunwell (1982), Ingram (1976, 1981), Edwards and Shriberg (1983), and Elbert and Gierut (1986), among others. Interestingly, however, the appearance of the term “clinical linguistics” dates to the end of this period, with the publication of the book of that title by David Crystal (1981). Crystal defines clinical linguistics as “the ­application of linguistic science to the study of communication disability, as ­encountered in clinical situations” (Crystal, 1981: 1). He added to this definition: “clinical ­linguistics is the application of the theories, methods and findings of ­linguistics (­including phonetics) to the study of those situations where language handicaps are diagnosed and treated” (Crystal, 1984: 31). Limiting the direction of application from linguistics to language disorder is intentional: “the orientation … should be noted. It may be contrasted with the approach of neurolinguists, for example, who study clinical language data in order to gain insights into linguistic or neurological theory” (Crystal, 1984: 30–31). Nevertheless, despite Crystal’s wish for clinical linguistics to be a unidirectional hybrid discipline, many researchers working in the field have adopted a bidirectional approach. For example, Ball and Kent (1987: 2) wrote that they preferred a definition that allows “either applying linguistic/phonetic analytic techniques to clinical problems, or showing how clinical data contribute to theoretical issues in linguistics/phonetics.” The work of Grodzinsky and colleagues (e.g. Grodzinsky, 1986, 1990) illustrates the use of data from language disorder to inform syntactic theory.

Clinical linguistics developed through the publication of a number of important books (some noted above), the drawing up of analysis procedures and the development of instrumental techniques (to which we return below). An important milestone for this new field of study was the launching of a new academic journal, Clinical Linguistics and Phonetics. This took place in 1987, with an initial volume of just two issues (soon increased to four). Now in its twenty-fifth year, the journal publishes 12 issues a year, testimony to the increase in interest and work in clinical linguistics.

1.2 The Role of Clinical Linguistics and Phonetics in Speech-Language Pathology

In this section we will look at some of the contributions made from clinical ­linguistics and phonetics to clinical practice and research in speech-language pathology, ­starting with the investigation of speech output impairments as informed by clinical phonetics. The description of disordered speech has benefitted in several ways from the input of clinical phonetics, not least in phonetic transcription, which forms the ­foundation on which much of both clinical decision-making and clinical speech research builds. Phonetic transcription using the IPA (International Phonetic Alphabet) has long been the norm in data analysis in disordered speech. However, it became clear fairly early on that the range of sounds encountered in the clinic appeared to be larger than the range encountered in natural language. At first ad hoc symbolizations were devised by speech-language pathologists (SLPs) to deal with sounds that could not be denoted through the use of IPA symbols or diacritics because they did not occur in natural language (Grunwell, 1982). In 1983 the King’s Fund in the UK published a paper describing a proposed range of additional symbols for just these atypical sounds: the Phonetic Representation of Disordered Speech (PRDS; PRDS, 1983). While a step forward, these PRDS symbols had limited currency, being little known, for example, in North America. The 1989 meeting of the International Phonetic Association in Kiel instituted a committee to examine the symbolization of atypical sounds found in disordered speech. It considered the PRDS symbols and other suggestions and eventually recommended a set of Extensions to the International Phonetic Alphabet (extIPA) for clinical use. This was described in Duckworth et al. (1990), and has been updated since (see, e.g. Ball, Müller, and Rutter (2010) for the most recent (2008) revision).

The provision of the extIPA symbols set (and later on the VoQS voice quality ­symbols; see Ball, Esling, and Dickson, 2000; Ball and Müller, 2005) is a good ­example of how insights from phonetics have influenced developments in communication disorders. However, it is also arguable that the needs of speech pathology (in this case the description, through transcription, of atypical speech) have informed ­phonetics. While it is true that Pike (1943) contained descriptions of a wide range of sounds (both linguistic and nonlinguistic), it is only since the development of extIPA that phoneticians seem to have recognized this range of sounds not found in natural language (for example, through the inclusion of the extIPA symbols in publications of the International Phonetic Association).

Another example of a two-way interaction between speech science and speech pathology can be found with instrumental analyses of speech. A wide range of these exist (see, e.g. Awan, 2008; Ball and Code, 1997; Gibbon, 2008; Kent and Kim, 2008; Whitehill and Lee, 2008; and Chapters 4, 12, and 13 in this volume). Some of these techniques examine speech production processes, some the acoustic signal, and others the perception of speech. While these techniques were mainly developed for the investigation of normal speech, some of them were given a special impetus through their use in the speech clinic. We can point to two of these in particular: electropalatography (EPG) and electroglottography (EGG) (also known as electrolaryngography, ELG). The work by Gibbon and colleagues on “covert contrasts” using EPG is a good illustration of this clinic–research interaction. Gibbon investigated articulatory contrasts made by a speaker that are not perceptible by the listener. For example, in Gibbon (1990) the author reports that one of two sisters is transcribed as backing alveolars to velars, but the other is not. EPG patterns recorded for both sisters had tongue contacts at both alveolar and velar positions at the onset of target alveolars, but the EPG tongue–palate contact patterns at the point of release differed. One sister released her velar contacts before her alveolar ones (thereby ­producing a release burst that was acoustically similar to that of the control subject), whereas the other released her alveolar contacts first and velar ones last, thereby producing a release burst that sounded like that of [g].

As Fourcin (2000) has pointed out, ELG (or EGG) can help establish links between objective measurement using laryngograph-type signals and the use of subjective auditory dimensions of voice quality description. This is because ELG measurement techniques are able to provide a way of escaping from the current clinical bias towards the utilization of data that are convenient for the researchers, because they are easy to measure (sustained vowels for example), but that are rather less relevant to real-life voice use.

Clinical linguistic research has also informed development of the application of phonology to disordered speech. As Bowen (2009) notes, insights from early phonological theory began to be applied clinically in the 1960s. Many researchers working within clinical linguistic tradition helped spread later theoretical developments within phonology to clinical situations. For example, Grunwell used Stampe’s framework of natural phonology in clinical assessment (Grunwell, 1987, 1997; Stampe, 1979).

Bernhardt and Stemberger, and Gierut and Dinnsen applied nonlinear models of phonology, and more recently Optimality Theory, to disordered speech data (Bernhardt and Gilbert, 1992; Bernhardt and Stemberger, 2000; Dinnsen, 1997; Dinnsen and Gierut, 2008), and the current authors have used more functional and cognitive ­models of phonology for the analysis of clinical data (Ball, Rutter, and Code, 2008; Müller, Ball, and Rutter, 2008). Ball, Müller, and Rutter (2010) describe a range of phonological approaches and how these can be used to analyze ­disordered-speech data and also to help plan intervention.

Concrete outcomes from clinical phonology include a range of assessment instruments based on different models of phonology, or combining several such approaches. Arguably, the two such assessments most within the clinical phonology tradition are the PACS procedure (Grunwell, 1985) and PROPH, a profile developed by David Crystal (Crystal, 1982) (see Ball and Müller, 1997, for a comparison of the two ­profiles). Both these assessments rely on naturalistic speech data and provide profiles of the speaker’s phonological abilities, using a range of phonological analyses, rather than standardized scores derived from a limited set of tokens.

1.3 Research Philosophies, and the Rest of this Book

Clinical linguistics and phonetics is far from a homogenous field in terms of research traditions, philosophies, and methods adopted by its practitioners. In fact one might go so far as to say that the one thing all clinical linguists and phoneticians have in common is an interest in data related to language or speech disorder, which in turn represents a rather wide remit, and not one that is entirely straightforward in definition (for instance, do we describe the communicative sequelae of dementia as primarily cognitive or linguistic, and indeed, what difference does it make?). Some clinical linguists would describe their work as, essentially, a branch of applied linguistics, where the application is the (eventual) translation of linguistic and phonetic analyses into clinical assessment and intervention, while others take theorizing about the nature of human language, speech, and cognition as their inspiration, and wish to investigate how impairments of speech and language inform such theories.

In all branches of science that ultimately take human conditions as their object of investigation, there is a potential tension between different scientific orientations (and at times, priorities). Thus, confronted with any one person with aphasia, one may ask numerous questions, such as, but not limited to, “what can this person’s history of stroke and the effects on her language processing tell me about human language?”; “what characteristics of aphasia do I see in this person?”; “which specific language skills are impaired by a stroke such as the one experienced by this person?”; “how does aphasia affect this person’s life?”; “what tools do I need to effectively assess the language skills and deficits in this person?”; “what do I need to know in order to plan effective intervention for this person?”; “what does this person have to tell me about how aphasia affects her life?”, and so forth.

The starting point for research in clinical linguistics and phonetics is always going to be a person with impaired language or speech, whether he or she is a participant in a group study, or a single “case.” While ethical conduct is of course a prerequisite of all good research, working with vulnerable populations such as children or people with a variety of impairments of communication and cognition imposes particularly stringent requirements. In Chapter 2 of this book, Thomas W. Powell discusses research ethics in the clinical arena, from the planning stage to the eventual ­dissemination of research results.

In order to situate different approaches to research in clinical linguistics and phonetics, and the role of the individual in them, it is useful to make reference to Luria’s distinction between classical and romantic science (Luria, 1987a, 1987b; see Sabat, 2001, for discussion, with specific reference to dementia research). Classical science is reductionist in philosophy and approach, and aims to find general and generalizable insights. Phenomena are analyzed into component parts which are investigated using standardized procedures. A classical researcher aims at discovering the, ideally, context-free essence of the object investigated, a “truth” or general characteristic that transcends any one individual case. Classical reductionist science is typified by experimental group studies. Thus, research aiming for explanations of “the nature of,” for instance, language impairment in aphasia, or Specific Language Impairment, or phonological delay tends towards experimental or quasi-experimental studies. Given the difficulty in finding large groups of people exhibiting sufficiently similar constellations of symptoms of speech or language impairment (in the absence of confounding variables, and well enough matched for the purposes of an experiment), many quasi-experimental studies in this field are case studies intended to contribute, by a process of accumulation, to a generalizable body of knowledge. Such clinical case studies have a long and proud history in medicine, psychology, and indeed the clinical speech and language sciences (see, e.g. Code et al., 1996, 2003).

Chapter 3 in this volume, by Vesna Mildner, is something of a tour de force of principles of experimental and quasi-experimental research as relevant to clinical linguistics and phonetics. Mildner discusses steps in experimental research design, the concepts of reliability and validity, the choice of appropriate design variants (including pre- and non-experimental designs), and questions of subject selection, data collection, and interpretation. May Bernhardt and colleagues (Chapter 4) use the International Classification for Function (ICF; WHO, 2007) as a framework for their chapter on experimental and quasi-experimental research on speech production and (re)habilitation. A researcher’s beliefs and assumptions are what underlie that researcher’s constructs of what constitutes, for example, “disorder,” and how it can be investigated. Judith Oxley’s chapter on experimental and quasi-experimental research on disordered language (Chapter 5) includes a discussion of nosological constructs, and of theories accounting for language development and change that drive research. At the heart of data analysis and interpretation in experimental and quasi-experimental research is the application of appropriate statistical methods, since statistical significance serves as a determinant of whether the hypothesis ­investigated is to be accepted or rejected. Statistical methods as applicable to clinical linguistics and phonetics are the topic of Chapter 14, by Eleanora Rossi.

With classical reductionist science, Luria contrasts what he calls romantic science, which is holistic in approach and philosophy and attempts to not reduce phenomena to abstract component parts and generalizable characteristics, but rather to “preserve the wealth of living reality” (1987b: 6). Clinical linguists and phoneticians oriented towards this goal often tend towards qualitative approaches, which involve a flexible approach to research design and the avoidance of a priori hypothesis formation. Qualitative studies in clinical linguistics are also often based on single cases, and include the layering of multiple types of data in an attempt to capture complexities embedded in, and emergent from, the real-life and individual concerns and priorities of the participant(s) (see Chapter 6, on qualitative research). Chapters 7 and 8 are dedicated to two strands of qualitative research, namely the Ethnography of Communication (by Jacqueline A. Guendouzi), and Conversation Analysis (by Scott Barnes and Alison Ferguson). Clinical sociolinguistics, which in Chapter 9 (by Martin J. Ball and Louise Keegan) is operationalized as the application of sociolinguistic methods (specifically the investigation of sociolinguistic variation) to the clinical context, is another branch of clinical linguistics that aims at capturing the complexity of the living reality of human communicative encounters; in this case, interactions with and between persons with speech and language impairments.

The core of any linguistic or phonetic analysis is a solid body of high-quality data, and many studies involve the processing of audio or video data. Chapter 10, by Benjamin Rutter and Stuart Cunningham, deals with audio and video data, the analytical purposes for which they are useful, and their recording and storage. Data recording is a first step in analysis, since the data recorded will constrain, and thereby help to focus, an analysis. Impressionistic approaches have long been a mainstay in clinical phonetics and linguistics. For such analyses, researchers employ a variety of transcription methods to transform audio or video data into a graphic source for and record of analyses. Such methods, their applicability to different areas of research, and their role in data analysis are the topic of Chapter 11, by Martin J. Ball and colleagues. While transcription-based approaches essentially rely on the transcriber’s perceptual and transcription skills to filter the data into usable units, acoustic data processing methods remove this particular filter from the analysis and base interpretation on acoustic measurements. Mark Huckvale (Chapter 12) presents an introduction to acoustic measures of voice pitch, voice quality, segmental characteristics, and prosody relevant for use in clinical phonetics. A further avenue of analysis in clinical phonetics is speech imaging, that is, a variety of techniques that produce visual representations of movements of the vocal tract. Such methods, their applicability in clinical phonetics, and the technical requirements involved are the topic of Chapter 13, by Joan Rahilly. In Chapter 15, Brian MacWhinney and colleagues present a branch of research that is becoming increasingly prominent in linguistics in general, and clinical linguistics in particular, namely corpus-based approaches. Given the rapid advances in storage and processing capacity of mainstream computing in recent years, it is now feasible for researchers to access and investigate large corpora of language data without having to invest in expensive specialist computer hardware (the same is also true of acoustic analysis; see Chapter 12). MacWhinney and colleagues base their chapter on the AphasiaBank project, which to our knowledge is the largest and fastest-­growing corpus of language data relating to language impairment in the world.

Doing research in clinical linguistics and phonetics is, in our humble opinion, fun while it lasts. However, it would not warrant the label of “research,” nor would it warrant inconveniencing research participants, unless the ultimate goal of the research endeavor is dissemination, that is, the publication of our investigations for scrutiny by the research community, and for the purpose of contributing to the available body of knowledge in our field. Writing and disseminating research can follow many avenues, including theses and dissertations in fulfillment of degree requirements, edited books, journal articles, conference presentations, and more. The writing and dissemination of research is discussed in the final chapter of this book (Chapter 16, by Sharynne McLeod).

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2    Research Ethics

Thomas W. Powell