Neural activity in areas V1, V2 and V4 during free viewing of natural scenes compared to controlled viewing

Jack L. Gallant, Charles Edward Connor, David C. Van Essen

Research output: Contribution to journalArticle

Abstract

Under natural viewing conditions primates make frequent exploratory eye movements across complex scenes. We recorded neural activity of 62 cells in visual areas V1, V2 and V4 in an awake behaving monkey that freely viewed natural images. About half of the cells studied showed a modulation in firing rate following some of the eye movements made during free viewing, though the proportions showing a discernible modulation varied across areas. These cells were also examined under controlled viewing conditions in which gratings or natural image patches were flashed in and around the classical receptive field while the animal performed a fixation task. Activity rates were generally highest with flashed gratings and lowest during free viewing. Flashed natural image patches evoked responses between these two extremes, and the responses were higher when the patches were confined to the classical receptive field than when they extended into the non-classical surround. Thus the reduction of activity during free viewing relative to that obtained with flashed gratings is partly attributable to natural images being less effective stimuli and partly to suppressive spatio-temporal neural mechanisms that are important during natural vision.

Original languageEnglish (US)
Pages (from-to)1673-1678
Number of pages6
JournalNeuroReport
Volume9
Issue number7
StatePublished - May 11 1998

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Eye Movements
Primates
Haplorhini

Keywords

  • Free viewing
  • Natural image
  • V1
  • V2
  • V4
  • Visual cortex

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Neural activity in areas V1, V2 and V4 during free viewing of natural scenes compared to controlled viewing. / Gallant, Jack L.; Connor, Charles Edward; Van Essen, David C.

In: NeuroReport, Vol. 9, No. 7, 11.05.1998, p. 1673-1678.

Research output: Contribution to journalArticle

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