Visual activation of frontal cortex: Segregation from occipital activity

C. D. Saron, C. E. Schroeder, J. J. Foxe, Jr Vaughan H.G.

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Studies in primates have found visually responsive neurons that are distributed beyond cortical areas typically described as directly involved in vision. Among these areas are premotor cortex, supplementary motor area, dorsolateral prefrontal cortex and frontal eye fields. Given these findings, visual stimulation would be expected to result in activation of human frontal cortex. However, few human studies have described sensory activations in frontal regions in response to simple visual stimulation. Such studies have classically described event-related potential (ERP) components over occipital regions. The present study sought to further characterize the spatiotemporal dynamics of visually-evoked electrocortical responses elicited by simple visual stimuli using scalp current density measures derived from high-density ERP recordings, with particular emphasis on the distribution of stimulus-related activity over frontal cortex. Hemiretinal stimuli were viewed passively and during a simple ipsi- or contramanual (RT) task. The motor requirement was included to investigate the effects of response preparation on premovement frontal activations. The results indicate early frontocentral activation, particularly over the right hemisphere (peak magnitude 124-148 ms) that is independent of input visual field or motor response requirement, and that is clearly separate in timecourse from the posterior responses elicited by visual input. These findings are in accord with the multiplicity of visual inputs to frontal cortex and are discussed in terms of frontal lobe functions as may be required in these tasks.

Original languageEnglish (US)
Pages (from-to)75-88
Number of pages14
JournalCognitive Brain Research
Volume12
Issue number1
DOIs
StatePublished - 2001
Externally publishedYes

Fingerprint

Frontal Lobe
Photic Stimulation
Motor Cortex
Evoked Potentials
Occipital Lobe
Prefrontal Cortex
Scalp
Visual Fields
Primates
Neurons

Keywords

  • Event-related potential
  • Frontal cortex
  • High-density mapping
  • Occipital activity
  • Scalp current density
  • Spatial attention
  • Visual activation

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Cognitive Neuroscience
  • Experimental and Cognitive Psychology

Cite this

Visual activation of frontal cortex : Segregation from occipital activity. / Saron, C. D.; Schroeder, C. E.; Foxe, J. J.; Vaughan H.G., Jr.

In: Cognitive Brain Research, Vol. 12, No. 1, 2001, p. 75-88.

Research output: Contribution to journalArticle

Saron, C. D. ; Schroeder, C. E. ; Foxe, J. J. ; Vaughan H.G., Jr. / Visual activation of frontal cortex : Segregation from occipital activity. In: Cognitive Brain Research. 2001 ; Vol. 12, No. 1. pp. 75-88.
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