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| Research article summary (published 30 Aug 2003): |
Catching oriented objects.
Full Abstract
We have investigated how participants match the orientation of a line, which moves on a vertical screen towards the subject. On its path to the participant, the line could disappear at several positions. Participants were instructed to put a bar on a predefined interception point on the screen, such that the bar touched the screen with the same orientation as the moving line at the very moment when the line passed through the interception point or (in case of line disappearance) when the hidden line would pass through the interception point (like in catching). Participants made significant errors for oblique orientations, but not for vertical and horizontal orientations of the moving line. These errors were small or absent when the moving line was visible all the way along its path on the screen. However, these errors became larger when the line disappeared farther away from the interception point. In the second experiment we tested whether these errors could be related to errors in visual perception of line orientation. The results demonstrate that errors in matching of the bar do not correspond to the last perceived orientation of the line, but rather to the perceived orientation of the moving line near the beginning of the movement path. This corresponds to earlier observations that participants shortly track a moving target and then make a saccadic eye movement to the interception point.
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Author information
Author/s: Hermens, Frouke (F); Gielen, Stan (S);
Affiliation: Department of Biophysics, Facultiet der Natuurwetenschappen, University of Nijmegen, Wiskunde en Informatica, Geert Grootteplein 21, 6525 EZ Nijmegen, The Netherlands. froukeh(-atsign-)mbfys.kun.nl
Journal and publication information
Publication Type: Journal Article
Journal: Acta psychologica (Acta Psychol (Amst)), published in Netherlands. (Language: eng)
Reference: 2003-Sep; vol 114 (issue 1) : pp 17-39
Dates: Created 2003/08/20; Completed 2003/10/10; Revised 2004/11/17;
PMID: 12927341, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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