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The effect of orientation on the clarity of Hermann grid illusory lines

The effect of orientation on the clarity of Hermann grid illusory lines The effect of orientation on the clarity of Hermann grid illusory lines DANALEE GOLDTHWAITE * and ANDREW CROWTHER The University College of the Cariboo, PO Box 3010, Kamloops, BC V2C 5N3, Canada Received 12 June 1998; accepted 20 July 1998 Abstract-To test the hypothesis that Hermann grid illusory lines are most clear when the grid is presented at a 45 deg, each of 20 participants underwent 10 trials in each of two conditions ('make the lines least clear' and 'make the lines most clear') which were run using a method of adjustment. A matched-pairs t-test applied to the means of the two conditions was significant beyond the 0.01 level. One-group t-tests supported the claim that the illusory lines are least clear for a vertical/horizontal orientation of the grid and most clear when it is rotated 45 deg. The results substantiate, in a systematic manner, 70 years of claims about the effects of grid orientation on illusory line clarity. THE EFFECT OF ORIENTATION ON THE CLARITY OF HERMANN GRID ILLUSORY LINES The Hermann grid is composed of dark squares separated by light lines. Illusory dark spots appear at the intersections of the white lines, as can be seen in http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Spatial Vision (continued as Seeing & Perceiving from 2010) Brill

The effect of orientation on the clarity of Hermann grid illusory lines

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Publisher
Brill
Copyright
© 1999 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0169-1015
eISSN
1568-5683
DOI
10.1163/156856899X00256
Publisher site
See Article on Publisher Site

Abstract

The effect of orientation on the clarity of Hermann grid illusory lines DANALEE GOLDTHWAITE * and ANDREW CROWTHER The University College of the Cariboo, PO Box 3010, Kamloops, BC V2C 5N3, Canada Received 12 June 1998; accepted 20 July 1998 Abstract-To test the hypothesis that Hermann grid illusory lines are most clear when the grid is presented at a 45 deg, each of 20 participants underwent 10 trials in each of two conditions ('make the lines least clear' and 'make the lines most clear') which were run using a method of adjustment. A matched-pairs t-test applied to the means of the two conditions was significant beyond the 0.01 level. One-group t-tests supported the claim that the illusory lines are least clear for a vertical/horizontal orientation of the grid and most clear when it is rotated 45 deg. The results substantiate, in a systematic manner, 70 years of claims about the effects of grid orientation on illusory line clarity. THE EFFECT OF ORIENTATION ON THE CLARITY OF HERMANN GRID ILLUSORY LINES The Hermann grid is composed of dark squares separated by light lines. Illusory dark spots appear at the intersections of the white lines, as can be seen in

Journal

Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill

Published: Jan 1, 1999

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