Abnormality of mismatch negativity in response to tone omission in dyslexic adults
| Autor: | Ian E. Holliday, Gareth R. Barnes, Caroline Witton, Alison E. Fisher, Ian L. Richards, Arjan Hillebrand |
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| Rok vydání: | 2005 |
| Předmět: |
Auditory perception
Adult Male medicine.medical_specialty media_common.quotation_subject Matched-Pair Analysis Population Mismatch negativity Stimulus (physiology) Audiology behavioral disciplines and activities Developmental psychology Dyslexia Discrimination Psychological Mental Processes Reference Values Perception medicine Humans education Molecular Biology media_common education.field_of_study medicine.diagnostic_test General Neuroscience Magnetoencephalography Stimulus onset asynchrony medicine.disease Pattern Recognition Physiological Auditory Perception Evoked Potentials Auditory Female Neurology (clinical) Psychology Developmental Biology |
| Zdroj: | Brain research. 1077(1) |
| ISSN: | 0006-8993 |
| Popis: | Evidence of abnormalities in the perception of rapidly presented sounds in dyslexia has been interpreted as evidence of a prolonged time window within which sounds can influence the perception of temporally surrounding sounds. We recorded the magnetic mismatch negativity (MMNm) to infrequent tone omissions in a group of six dyslexic adults and six IQ and age-matched controls. An MMNm is only elicited in response to a complete stimulus omission when successive inputs fall within the temporal window of integration (stimulus onset asynchrony (SOA) approximately 160 ms). No MMNm responses were recorded in either experimental group when stimuli were presented at SOAs falling just outside the temporal window of integration (SOA = 175 ms). However, while presentation rates of 100 ms resulted in MMNm responses for all control participants, the same stimulus omissions elicited an MMNm response in only one of the six dyslexic participants. These results cannot support the hypothesis of a prolonged time window of integration, but rather indicate auditory grouping deficits in the dyslexic population. |
| Databáze: | OpenAIRE |
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