Task-dependent laterality for cue decoding during spoken language processing.
The task-dependent laterality of the auditory cortices was investigated by measuring the magnetic fields elicited by three forms of a Japanese verb, which differed in terms of prosodic and phonetic cues. Significant task-dependent magnetic fields were found in both hemispheres during a prosody-related task, but only in the left during a phoneme-related task. The latency was similar to the mismatch negatively which reflects the neural activity of automatic cue decoding. These results suggest that task-dependent schemata are activated at least partially in parallel with automatic cue-decoding processes such that those in the left hemisphere process linguistic information irrespective of acoustic cues whereas those in the right hemisphere process prosodic information.
Imaizumi
S
S
Department of Speech and Cognitive Sciences, Graduate School of Medicine, University of Tokyo, Bunkyo, Japan.
Mori
K
K
Kiritani
S
S
Hosoi
H
H
Tonoike
M
M
D000328:Adult; D003463:Cues; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D008606:Mental Processes / Q000502:physiology*; D008875:Middle Aged; D008959:Models, Neurological; D013067:Speech Perception / Q000502:physiology*