| Oculomotor prediction of accelerative target motion during occlusion: long-term and short-term effects. | |
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MedLine Citation:
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PMID: 20556369 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The present study examined the influence of long-term (i.e., between-trial) and short-term (i.e., within-trial) predictive mechanisms on ocular pursuit during transient occlusion. To this end, we compared ocular pursuit of accelerative and decelerative target motion in trials that were presented in random or blocked-order. Catch trials in which target acceleration was unexpectedly modified were randomly interleaved in blocked-order trials. Irrespective of trial order, eye velocity decayed following target occlusion and then recovered towards the different levels of target velocity at reappearance. However, the recovery was better scaled in blocked-order trials than random-order trials. In blocked-order trials only, the reduced gain of smooth pursuit during occlusion was compensated by a change in saccade amplitude and resulted in total eye displacement (TED) that was well matched to target displacement. Subsidiary analysis indicated that three repeats of blocked-order trials was sufficient for participants to modify eye displacement compared to that exhibited in random-order trials, although more trials were required before end-occlusion eye velocity was better scaled. Finally, we found that participants exhibited evidence of a scaled response to an unexpected change in target acceleration (i.e., catch trials), although there were also transfer effects from the preceding blocked-order trials. These findings are consistent with the suggestion that on-the-fly prediction (short-term effect) is combined with memorized information from previous trials (long-term effect) to generate a persistent and veridical prediction of occluded target motion. |
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Authors:
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Simon J Bennett; Jean-Jacques Orban de Xivry; Philippe Lefèvre; Graham R Barnes |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-06-17 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale Volume: 204 ISSN: 1432-1106 ISO Abbreviation: Exp Brain Res Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-07-14 Completed Date: 2010-12-10 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: Germany |
Other Details:
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Languages: eng Pagination: 493-504 Citation Subset: IM |
Affiliation:
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Research Institute for Exercise and Sport Sciences, Liverpool John Moores University, Liverpool L3 3AF, UK. s.j.bennett@ljmu.ac.uk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acceleration* Adaptation, Physiological / physiology Adult Feedback Humans Motion Perception / physiology* Photic Stimulation / methods Psychomotor Performance / physiology Pursuit, Smooth / physiology Reaction Time / physiology* Saccades / physiology Time Factors Volition / physiology |
| Grant Support | |
ID/Acronym/Agency:
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//Medical Research Council |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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