Surfaces versus features in visual search

Article Abstract:

Binocular disparity strongly influences the slowing of visual search though only when the disparity eases perception of the entire surface that is seen through an adjoining occluder. Experiments involving the degrading of visual search through control of binocular disparity showed the identical features of a surface are seen as parts of a surface by means of visual completion. This makes the surfaces less distinguishable as targets and distractors. Hence visual search must rely on a higher level process of surface representation.

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Visual attention modulates metacontrast masking

Article Abstract:

A newly discovered visual stimulus reveals that the 'top down' influence in vision such as voluntary visual attention is capable of modulating the visual illusion, 'metacontrast.' The process of 'metacontrast' indicates that visual perception occurs continuously in discrete stages but not instantaneously. Experiments performed to discover the visual stimulus and the features of 'metacontrast' reveal that the human visual system creates the representation of objects by autonomous visual processes and not by cognitive mechanisms.

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