Facilitation from collinear flanks is cancelled by non-collinear flanks.
Detection of a central Gabor pattern is facilitated by the presence of collinear flanking patterns. We find that this facilitation is greatly reduced when the collinear flanks are combined with non-collinear flanks to form a coherent surround. These results are unlikely to be explained by mechanisms that merely transduce local contrast in a nonlinear fashion. A model wherein the outputs of such mechanisms are combined anisotropically provides a better account for these results.
Solomon
J A
JA
Institute of Ophthalmology, University College London, UK. j.solomon@ucl.ac.uk
Morgan
M J
MJ
D000223:Adaptation, Psychological; D005366:Figural Aftereffect / Q000502:physiology; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology*; D012684:Sensory Thresholds / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology