Pattern motion is present in V1 of awake but not anaesthetized monkeys

K. Guo, C. Blakemore, Philip John Benson

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

We compared responses of neurons, recorded in striate cortex (area V1) of awake, fixating monkeys, to a single drifting grating with those to a 'plaid' pattern comprised of two superimposed drifting gratings separated in orientation by 90degrees. Five out of 54 (9%) of V1 direction selective neurons responded to the direction of motion of the whole pattern [pattern motion (PM) selectivity]. Tuning curves for plaid stimuli were similar in both optimum direction and width of tuning to those for single gratings. Twenty nine out of 54 (54%) responded simply to the motion of individual orientated gratings within the pattern [component motion (CM) selectivity]. The remaining 37% (20/54) neurons were unclassified. In control experiments, 39 direction selective neurons were recorded in area V1 of anaesthetized monkey and cats. Unlike area V1 in behaving monkeys, none of these neurons exhibited IPM selectivity to the drifting plaids. Twenty eight out of 39 (72%) of them responded to the direction of the component gratings and were classified as CM selectivity Our results indicate that although most V1 neurons are CM selective, as described in anaesthetized animals, a subpopulation is clearly PM selective in behaving monkeys, reflecting integration of locally derived motion signals. Neurons in V1 therefore carry signals that may contribute to pattern motion processing and perception. This perceptual interpretation in V1 might depend much more critically on information integration mechanisms that only function properly in awake, perceiving animals.

Original languageEnglish
Pages (from-to)1055-1066
Number of pages11
JournalEuropean Journal of Neuroscience
Volume19
Issue number4
DOIs
Publication statusPublished - 2004

Keywords

  • monkey
  • motion selectivity
  • pattern motion
  • striate cortex
  • PRIMARY VISUAL-CORTEX
  • DIRECTION-SELECTIVE CELLS
  • CORTICAL AREA MT
  • RECEPTIVE-FIELDS
  • MACAQUE MONKEY
  • STRIATE CORTEX
  • FUNCTIONAL ARCHITECTURE
  • 2ND-ORDER MOTION
  • EYE-MOVEMENTS
  • NEURONS

Cite this