Frontmatter -- PREFACE -- TABLE OF CONTENTS -- PART I. AN OVERVIEW -- THEORETICAL CONSIDERATIONS -- EXPERIMENTAL EVIDENCE -- LINGUISTIC ASPECTS -- CLINICAL CONSIDERATIONS -- PART II. AN INVESTIGATION -- PROBLEM AND PROCEDURE -- RESULTS -- DISCUSSION -- SUMMARY -- PART III -- THEORETICAL IMPLICATIONS -- APPENDICES -- APPENDIX A. THE PILOT INVESTIGATIONS -- APPENDIX B. DESCRIPTION OF MAJOR INSTRUMENTATION -- BIBLIOGRAPHY -- Backmatter