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ERIC Number: EJ932345
Record Type: Journal
Publication Date: 2010-Dec
Pages: 13
Abstractor: As Provided
ISSN: ISSN-0096-1523
An fMRI Study of Parietal Cortex Involvement in the Visual Guidance of Locomotion
Billington, Jac; Field, David T.; Wilkie, Richard M.; Wann, John P.
Journal of Experimental Psychology: Human Perception and Performance, v36 n6 p1495-1507 Dec 2010
Locomoting through the environment typically involves anticipating impending changes in heading trajectory in addition to maintaining the current direction of travel. We explored the neural systems involved in the "far road" and "near road" mechanisms proposed by Land and Horwood (1995) using simulated forward or backward travel where participants were required to gauge their current direction of travel (rather than directly control it). During forward egomotion, the distant road edges provided future path information, which participants used to improve their heading judgments. During backward egomotion, the road edges did not enhance performance because they no longer provided prospective information. This behavioral dissociation was reflected at the neural level, where only simulated forward travel increased activation in a region of the superior parietal lobe and the medial intraparietal sulcus. Providing only near road information during a forward heading judgment task resulted in activation in the motion complex. We propose a complementary role for the posterior parietal cortex and motion complex in detecting future path information and maintaining current lane positioning, respectively. (Contains 3 tables and 7 figures.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A