A Model of Neuronal Responses in Visual Area MT
Appears in:
Vision Research
38(5): 743-761, 1998.
© Elsevier Science B.V.
Electrophysiological studies indicate that neurons in the Middle
Temporal (MT) area of the primate brain are selective for the velocity
of visual stimuli. This paper describes a computational model of MT
physiology, in which local image velocities are represented via the
distribution of MT neuronal responses. The computation is performed in
two stages, corresponding to neurons in cortical areas V1 and MT.
Each stage computes a weighted linear sum of inputs, followed by
rectification and divisive normalization. V1 receptive field weights
are designed for orientation and direction selectivity. MT receptive
field weights are designed for velocity (both speed and direction)
selectivity. The paper includes computational simulations accounting
for a wide range of physiological data, and describes experiments that
could be used to further test and refine the model.
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