Comparison of manual and fixation reaction time for non-accidental properties in contours Y T H Schelske1, T Ghose2, M Sassi3, J Wagemans3 |
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1Technical University of Kaiserslautern, Germany |
| Non-accidental-properties (NAPs), such as intersection, parallelism and symmetry are regularities in the arrangement of 2D image features that are used to infer 3D spatial relations. Here we compare the reaction-time (RT) for eye-movement and manual-response data for various NAPs. We used one or two Gaborized contours (snakes) embedded within an array of equi-density Gabor distractors. Contours were defined exclusively by good continuity of the oriented Gabors elements on a straight or curved path. The two contours could occur in four configurations: Intersection, Parallel, Symmetric or Random, in any of the four quadrants of the screen. We measured the benefit of NAPs w.r.t. the relations between the two snakes over mere probability summation, both on initial detection and on a subsequent recognition task. We examined effects on eye-movement (EM-RT) time for first-fixation near the snake and on manual-response (M-RT) time for a key-press to indicate detection. We found significant effects of NAPs on EM-RT and M-RT with specific trends suggesting different levels of cognitive processing for various NAPs from its first detection by EM to action. |
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