Is There an Assignment of Top and Bottom during Symmetry Perception? | Zendy

Johan Hulleman | Zendy; Glyn W. Humphreys | Zendy

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Is There an Assignment of Top and Bottom during Symmetry Perception?

Author(s) -

Johan Hulleman,

Glyn W. Humphreys

Publication year - 2004

Publication title -

perception

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 91

eISSN - 1468-4233

pISSN - 0301-0066

DOI - 10.1068/p5092

Subject(s) - stimulus (psychology) , perception , top down and bottom up design , psychology , orientation (vector space) , point reflection , polarity (international relations) , cognitive psychology , computer science , geometry , mathematics , chemistry , neuroscience , biochemistry , software engineering , cell

We report data from a discrimination task in which participants had to decide whether a single-item display was either vertically symmetric or asymmetric. This decision was found to be easier when items with a top bottom polarity were placed in an orientation where the wide end was the base of the stimulus and the narrow end was the top. The difference in reaction times between this orientation and its inversion was about 10 ms. We suggest that top and bottom labels are assigned to stimuli during the detection of bilateral symmetry.

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