Abstract
Zusammenfassung: Unterschiede in der zeitlichen Integration bei präattentiver auditiver Reizverarbeitung wurden bei 12 erwachsenen dyslektischen Lesern und einer Kontrollgruppe untersucht. Dazu wurde die Mismatch-Negativität (MMN), eine Komponente des auditiven ereigniskorrelierten Hirnpotenzials, die die automatische Entdeckung von Veränderungen der akustischen Umgebung reflektiert, verwendet. Die von gelegentlich auftretenden Tonauslassungen in einer ansonsten regelmäßigen Tonfolge evozierte MMN wurde genutzt, um zeitliche Integrationsmechanismen im auditiven System zu untersuchen. In Experiment 1 wurden in einer ansonsten regelmäßigen Tonfolge gelegentlich Töne ausgelassen, wobei sich die präsentierten Blöcke in ihrem Interstimulus-Intervall unterschieden (120ms, 150ms, 180ms, 200ms, 220ms). In Experiment 2 wurde die Genauigkeit des auditiven Integrationsmechanismus untersucht. Es ergaben sich keine Gruppenunterschiede in Amplitude, Latenz oder Topographie für die durch Tonauslassungen oder Tonabweichungen evozierte MMN. Diese Ergebnisse werden im Hinblick auf theoretische Vorstellungen, die von einem zeitlichen Verarbeitungsdefizit bei konstitutioneller Dyslexie ausgehen, diskutiert.
Abstract: 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.
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