Filter Selection Model for Generating Visual Motion Signals

Neurons in area MT of primate visual cortex encode the velocity of moving objects. We present a model of how MT cells aggregate responses from V1 to form such a velocity representation. Two different sets of units, with local receptive fields, receive inputs from motion energy filters. One set of units forms estimates of local motion, while the secondset computes the utility of these estimates. Outputs from this second set of units "gate" the outputs from the first set through a gain control mechanism. This active process for selecting only a subset of local motion responses to integrate into more global responses distinguishes our model from previous models of velocity estimation. The model yields accurate velocity estimates in synthetic images containing multiple moving targets of varying size, luminance, and spatial frequency profile and deals well with a number of transparency phenomena.

• Type: Conference
• Year: 1992
• Where: NIPS
• Authors: Steven J. Nowlan, Terrence J. Sejnowski
• Keywords: Cells Aggregate Responses, Local Motion, NIPS 1992, NIPS 2007, Velocity