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ERIC Number: EJ860091
Record Type: Journal
Publication Date: 2009-Aug
Pages: 10
Abstractor: As Provided
Reference Count: 32
ISSN: ISSN-0096-1523
Perceived Shrinkage of Motion Paths
Sinico, Michele; Parovel, Giulia; Casco, Clara; Anstis, Stuart
Journal of Experimental Psychology: Human Perception and Performance, v35 n4 p948-957 Aug 2009
We show that human observers strongly underestimate a linear or circular trajectory that a luminous spot follows in the dark. At slow speeds, observers are relatively accurate, but, as the speed increases, the size of the path is progressively underestimated, by up to 35%. The underestimation imposes little memory load and does not require tracking of the trajectory. Most importantly, we found that underestimation occurred only when successive motion vectors changed in direction. This suggests a perceptual rather than representational origin of the illusion, related to vector-sum integration over time of neural motion signals in different directions. (Contains 3 footnotes and 9 figures.)
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:; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Italy