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Micropattern orientation and spatial localization.

By David R.T. Keeble and S. Nishida


NoA current, popular, theory of spatial localization holds that the visual system represents the location of simple objects by a single positional tag, the accuracy of which is largely independent of the internal properties of the object. We have already presented evidence of the limitations of such a view (Keeble & Hess (1998). Vision Research, 38, 827-840) in that 3-micropattern alignment performance was found to be dependent on the orientation of the micropatterns. We tested whether this was caused by a local anisotropy in positional coding by conducting 3-micropattern bisection experiments with varying patch orientation. No corresponding effect of patch orientation was found, implying a difference in the mechanisms used for the two tasks. In a further experiment we show that alignment task performance is very similar to the otherwise identical 2-patch orientation discrimination task. We conclude that the 3-micropattern alignment task is mediated by orientational mechanisms. We therefore present a 2nd-order orientation model for 3-patch alignment

Topics: Human, Perception, Psychophysics, Stimulus localization, Spatial orientation, Space perception, Vision, Experimental study
Year: 2009
DOI identifier: 10.1016/S0042-6989(01)00210-3
OAI identifier:
Provided by: Bradford Scholars
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