Neurally-plausible position-invariant flow field detectors

We previously demonstrated that it is possible to learn position-independent responses to rotation and dilation by filtering rotations and dilations with different centers through an input layer with MT-like speed and direction tuning curves and connecting them to an MST-like layer with simple Hebbian synapses (Sereno and Sereno 1991). By analyzing an idealized version of the network with broader, sinusoidal direction-tuning and linear speed-tuning, Kechen Zhang showed analytically that a Hebb rule trained with arbitrary rotation, dilation/contraction, and translation velocity fields yields units with weight fields that are a rotation plus a dilation or contraction field, and whose responses to a rotating or dilating/contracting disk are exactly position-independent. Differences between the performance of this idealized model and our original model (and real MST neurons) are discussed.

Proof of position-invariant response to flow fields

Response elicited by a rotating (a) or dilating (b) ring in a receptive field with circular or radial distribution of direction selectivity is independent of the position of the ring (see Zhang, Sereno, and Sereno, 1993).

Back to the sereno homepage

Back to the cogsci homepage