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ERIC Number: EJ735407
Record Type: Journal
Publication Date: 2006-Feb
Pages: 9
Abstractor: Author
ISBN: N/A
ISSN: ISSN-0096-1523
EISSN: N/A
Judgments of Path, Not Heading, Guide Locomotion
Wilkie, Richard M.; Wann, John P.
Journal of Experimental Psychology: Human Perception and Performance, v32 n1 p88-96 Feb 2006
To steer a course through the world, people are almost entirely dependent on visual information, of which a key component is optic flow. In many models of locomotion, heading is described as the fundamental control variable; however, it has also been shown that fixating points along or near one's future path could be the basis of an efficient control solution. Here, the authors aim to establish how well observers can pinpoint instantaneous heading and path, by measuring their accuracy when looking at these features while traveling along straight and curved paths. The results showed that observers could identify both heading and path accurately (approximately 3 degrees) when traveling along straight paths, but on curved paths they were more accurate at identifying a point on their future path (approximately 5 degrees) than indicating their instantaneous heading (approximately 13 degrees). Furthermore, whereas participants could track changes in the tightness of their path, they were unable to accurately track the rate of change of heading. In light of these results, the authors suggest it is unlikely that heading is primarily used by the visual system to support active steering.
American Psychological Association. Journals Department, 750 First Street NE, Washington, DC 20002-4242. Tel: 800-374-2721; Tel: 202-336-5510; Fax: 202-336-5502; e-mail: order@apa.org; Web site: http://www.apa.org/publications.
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A