| Expansion of direction space around the cardinal axes revealed by smooth pursuit eye movements. | |
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MedLine Citation:
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PMID: 15664182 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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It is well established that perceptual direction discrimination shows an oblique effect; thresholds are higher for motion along diagonal directions than for motion along cardinal directions. Here, we compare simultaneous direction judgments and pursuit responses for the same motion stimuli and find that both pursuit and perceptual thresholds show similar anisotropies. The pursuit oblique effect is robust under a wide range of experimental manipulations, being largely resistant to changes in trajectory (radial versus tangential motion), speed (10 versus 25 deg/s), directional uncertainty (blocked versus randomly interleaved), and cognitive state (tracking alone versus concurrent tracking and perceptual tasks). Our data show that the pursuit oblique effect is caused by an effective expansion of direction space surrounding the cardinal directions and the requisite compression of space for other directions. This expansion suggests that the directions around the cardinal directions are in some way overrepresented in the visual cortical pathways that drive both smooth pursuit and perception. |
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Authors:
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Anton E Krukowski; Leland S Stone |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Neuron Volume: 45 ISSN: 0896-6273 ISO Abbreviation: Neuron Publication Date: 2005 Jan |
Date Detail:
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Created Date: 2005-01-24 Completed Date: 2005-03-09 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8809320 Medline TA: Neuron Country: United States |
Other Details:
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Languages: eng Pagination: 315-23 Citation Subset: IM; S |
Affiliation:
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Human Factors Research and Technology Division, NASA Ames Research Center, Moffett Field, CA 94035, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Anisotropy Brain / physiology* Humans Models, Neurological Motion Perception / physiology* Oculomotor Muscles / physiology Orientation / physiology Photic Stimulation Pursuit, Smooth / physiology* Space Perception / physiology* Visual Pathways / physiology* |
| Investigator | |
Investigator/Affiliation:
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L S Stone / NASA ARC |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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