Anu Kujala|Kimmo Alho|Elisabet Service|Risto J. Ilmoniemi|John F. Connolly
Activation in the anterior left auditory cortex associated with phonological analysis of speech input: localization of the phonological mismatch negativity response with MEG
University of Helsinki|University of Helsinki|Dalhousie University|University of Helsinki|University of Helsinki|Helsinki University Hospital|Dalhousie University
spatiotemporal dynamics cortical activation underlying auditory word recognition particularly phonological stage studied wholehead magnetoencephalography meg subjects performed visuoauditory priming task known evoke phonological mismatch negativity pmn response elicited violations phonological expectancies words nonwords presented separate conditions 318 trials subjects first saw wordnonword eg cat soon followed prime letter eg h task replace mentally sound first letter wordnonword prime letter thus resulting new wordnonword eg hat finally auditory wordnonword either matching mismatching anticipated item presented subjects pmnm followed later n400mlike negativity obtained left hemisphere mismatching auditory stimuli similar response pattern obtained right hemisphere subjects source localization n1m index acoustic analysis pmnm n400mlike responses performed using l1 minimumnorm estimation left hemisphere pmnm source words significantly anterior source n400mlike response nonwords pmnm source significantly anterior sources n1m n400mlike response results suggest lefthemisphere neuronal networks involved sublexical phonological analysis least partly different responsible earlier acoustic later whole item processing speech input