Orientation and color processing for partially occluded objects.
The McCollough orientation-contingent color aftereffect could be equally well elicited by either a full test pattern of black and white stripes or a similar test pattern that was largely occluded by white surfaces, provided the latter stripes were made to appear as through continuing under the white surfaces--by means of stereo depth cues. The color aftereffect appeared concentrated around the edges of the stripes that protruded out from under the white surfaces; surfaces that themselves continued to appear a uniform white as shown by color matches. These results suggest that occluded, perceptually-continued edges can elicit the McCollough effect, which is generally thought to occur quite early in the visual pathway.
Watanabe
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Vision Sciences Laboratory, Arizona State University West, Phoenix 85069-7100.
D000221:Adaptation, Ocular / Q000502:physiology; D000328:Adult; D000360:Afterimage / Q000502:physiology*; D003118:Color Perception / Q000502:physiology*; D003463:Cues; D003867:Depth Perception / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology; D010470:Perceptual Masking / Q000502:physiology; D012399:Rotation; D015357:Vision Disparity