Concentric orientation summation in human form vision

Vision Res. 1997 Sep;37(17):2325-30. doi: 10.1016/s0042-6989(97)00104-1.


Psychophysical data demonstrate that orientation information in concentric, random-dot Glass patterns is summed linearly to extract a global form percept. Surprisingly, no such global pooling was found for Glass patterns with parallel structure. A simple neural model explains these results and agrees with recent V4 single unit physiology. As V4 provides the major input to IT, global concentric units may play an important role in analyzing complex images such as faces. In support of this possibility, deficits in the perception of concentric Glass patterns have recently been linked to prosopagnosia.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Humans
  • Models, Neurological*
  • Neurons / physiology
  • Pattern Recognition, Visual / physiology*
  • Photic Stimulation / methods
  • Sensory Thresholds