BRAIN IMAGINGUnified inflectional processing of regular and irregular verbs: a PET studySach, M.1 CA; Seitz, R. J.; Indefrey, P.2Author Information University Hospital Düsseldorf, Department of Neurology, Moorenstr. 5, 40225 Düsseldorf, Germany 2Max Planck Institute for Psycholinguistics, Postbus 310, 6500 AH Nijmegen; F.C. Donders Centre for Cognitive Neuroimaging, Postbus 9101, 6500 HB Nijmegen, Netherlands 1Present Address: University Hospital Hamburg Eppendorf, Department of Neurology, Martinistr. 52, 20246 Hamburg, Germany CACorresponding Author: [email protected] Received 19 November 2003; accepted 3 December 2003 NeuroReport: March 1st, 2004 - Volume 15 - Issue 3 - p 533-537 Buy SDC Abstract Psycholinguistic theories propose different models of inflectional processing of regular and irregular verbs: dual mechanism models assume separate modules with lexical frequency sensitivity for irregular verbs. In contradistinction, connectionist models propose a unified process in a single module. We conducted a PET study using a 2 × 2 design with verb regularity and frequency. We found significantly shorter voice onset times for regular verbs and high frequency verbs irrespective of regularity. The PET data showed activations in inferior frontal gyrus (BA 45), nucleus lentiformis, thalamus, and superior medial cerebellum for both regular and irregular verbs but no dissociation for verb regularity. Our results support common processing components for regular and irregular verb inflection. © 2004 Lippincott Williams & Wilkins, Inc.