Zeitliche integration im auditiven system bei Erwachsenen mit konstitutioneller dyslexie

We studied differences in temporal integration in preattentive auditory processing in a group of 12 adult developmental dyslexics and 12 normal readers by use of the mismatch negativity component of the auditory event-related brain potential (MMN). The MMN reflects the automatic detection of sound change. MMN to occasionally omitted sounds in a tone series can be used to investigate the time course of temporal integration in the auditory system. In experiment 1, occasionally omitted sounds in an otherwise regular tone series were presented in blocks with different inter-stimulus-intervals (120ms, 150ms, 180ms, 200ms, 220ms). Experiment 2 addressed the precision of the temporal integration mechanism. No group differences emerged for amplitude, latency or topography of the MMN evoked by tone omissions or tone deviations. These results are discussed with respect to current theories of temporal processing deficits in developmental dyslexia.