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Auditory Temporal Processing and its Disorders$
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Jos J. Eggermont

Print publication date: 2015

Print ISBN-13: 9780198719090

Published to Oxford Scholarship Online: May 2015

DOI: 10.1093/acprof:oso/9780198719090.001.0001

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Multimodal interactions and auditory temporal processing

Multimodal interactions and auditory temporal processing

(p.284) Chapter 16 Multimodal interactions and auditory temporal processing
Auditory Temporal Processing and its Disorders

Jos Eggerrmont

Oxford University Press

There is increasing evidence that auditory temporal processing deficits are not restricted to the auditory domain, but are multimodal. Multi-modal temporal processing requires a multimodal internal clock in the brain to synchronize activity from various senses. Network oscillations may serve as a highly effective, biologically plausible and purely internal reference frame that can create informative spike patterns without requiring an external timing signal. Simultaneity judgments and temporal order judgments employ different perceptual processes, which has to be considered when used as a test of temporal processing in disorders. Multimodal interaction dominantly takes place in the caudal belt areas of auditory cortex in non-human primates, but can also occur in primary auditory cortex particularly by the presence of visual stimuli. Auditory-tactile interaction is found dominantly in the caudal belt and just as for audio-visual interaction is a bottom-up process as it occurrs in anesthetized animals. Non-cortical areas are also implicated in auditory temporal processing, particularly the cerebellum in sub-seconds-range interval measurement, and the basal ganglia for the longer seconds-range intervals. Both regions are thought to play a role in phonological processing. Audio-visual interaction shows a 10 + years maturational time course, however does not appear to be degrading in older adults. Audio-visual temporal processing deficits are found in dyslexia, in specific language impairment and in auditory processing disorder. In autism, the temporal integration window for audio-visual tasks is lengthened and this relates to speech processing deficits. In autism, schizophrenia and epilepsy all temporal processing disorders were multi-modal.

Keywords:   internal clock, network oscillations, cerebellum, basal ganglia, audio-visual interaction, audio-tactile interaction, simultaneity judgment, temporal order judgment, multi-modal deficits

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