| Temporal processing of active and passive head movement. | |
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MedLine Citation:
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PMID: 21805199 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The brain can know about an active head movement even in advance of its execution by means of an efference copy signal. In fact, sensory correlates of active movements appear to be suppressed. Passive disturbances of the head, however, can be detected only by sensory feedback. Might the perceived timing of an active head movement be speeded relative to the perception of a passive movement due to the efferent copy (anticipation hypothesis) or delayed because of sensory suppression (suppression hypothesis)? We compared the perceived timing of active and passive head movement using other sensory events as temporal reference points. Participants made unspeeded temporal order and synchronicity judgments comparing the perceived onset of active and passive head movement with the onset of tactile, auditory and visual stimuli. The comparison stimuli had to be delayed by about 45 ms to appear coincident with passive head movement or by about 80 ms to appear aligned with an active head movement. The slow perceptual reaction to vestibular activation is compatible with our earlier study using galvanic stimulation (Barnett-Cowan and Harris 2009). The unexpected additional delay in processing the timing of an active head movement is compatible with the suppression hypothesis and is discussed in relation to suppression of vestibular signals during self-generated head movement. |
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Authors:
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Michael Barnett-Cowan; Laurence R Harris |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-30 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Experimentation cerebrale Volume: - ISSN: 1432-1106 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-8-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Multisensory Integration Laboratory, Centre for Vision Research, Department of Psychology, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada, mbarnettcowan@gmail.com. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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