Neural correlates of shape-from-shading.
Visual evoked potentials were recorded during presentation of a single stimulus that generated bi-stable perceptual alternation between two different three-dimensional percepts. One interpretation (asymmetric) changed depth structure from flat to corrugated in depth and the other (symmetric) had the appearance of a flat surface translating laterally behind a set of apertures. Responses during perception of the asymmetric three-dimensional structure contained larger negative components than did responses during perception of the symmetric three-dimensional structure. Control experiments suggest that the interpretation of depth structure is selected after junction information caused by the interplay between shading and object shape is extracted.
Hou
Chuan
C
The Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115, USA. chuanhou@ski.org
Pettet
Mark W
MW
Vildavski
Vladimir Y
VY
Norcia
Anthony M
AM
D000328:Adult; D003867:Depth Perception / Q000502:physiology; D004569:Electroencephalography; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005133:Eye Movements / Q000502:physiology; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D009039:Motion Perception / Q000502:physiology; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation / Q000379:methods