ABSTRACT
The processing of motion information is a fundamental and elementary function in biological visual systems. Perception of depth, segregation of objects, discrimination of figure from the ground, and detection of moving objects are a few tasks among many others that rely on visual motion perception. Several of the models were developed in artificial intelligence and machine vision; hence, they may be unfit for modeling motion perception in biological systems. The chapter presents shunting inhibition-based models of direction selectivity. In particular, it discusses a shunting inhibitory motion detector that belongs to the family of intensity-based schemes is developed and some of its response characteristics. In the human visual system, it seems that the short-range process is an intensity-based scheme; whereas the long-range process, which has been suggested to be crucial to the recovery of structure from motion, is a feature-matching scheme.
