BRAIN AND LANGUAGE 39, 107-133 (1990) Hemispheric Involvement in Shadowing vs. Interpretation: A Time-Sharing Study of Simultaneous Interpreters with Matched Bilingual and Monolingual Controls ADELE GREEN Youngstown State University NANCY SCHWEDA NICHOLSON University of Delaware JYOTSNA VAID Texas A & M NANCY WHITE Youngstown State University AND RICHARD STEINER University of Akron A time-sharing study used shadowing and interpretation/paraphrasing tasks to evaluate lateralization in professional interpreters individually matched to bi- lingual and monolingual controls. A two-step multivariate general linear model procedure was used to determine lateralized effects and extent of disruption The present research was supported by a grant to Nancy Schweda Nicholson by the University of Delaware Research Foundation. The authors express appreciation to Dr. Maria Achkar who served as bilingual coexaminer and Tom Caisango who served as student coexaminer in Youngstown test sites. In addition, George Michaels in Washington, D.C. and Bill Stapleton in Youngstown, Ohio are to be credited for consultation on maintenance of equipment. We also thank the following who provided us with test sites outside the Youngstown area: Dr. Loraine Obler, CUNY Graduate School; Stephanie R. van Reig- 107 0093-934x/90 $3.00 Copyright 0 1990 by Academic Press, Inc. All rights of reproduction in any form reserved.