A model of neuronal responses in visual area MT

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)743-761
Number of pages19
JournalVision research
Volume38
Issue number5
DOIs
StatePublished - Mar 1998

Keywords

  • MT
  • Model
  • Normalization
  • Opponency
  • Velocity

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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