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Spatial attention modulates initial afferent activity in human primary visual cortex.

Simon P Kelly1, Manuel Gomez-Ramirez, John J Foxe

  • 1The Cognitive Neurophysiology Laboratory, Nathan S. Kline Institute for Psychiatric Research, Program in Cognitive Neuroscience and Schizophrenia, 140 Old Orangeburg Road, Orangeburg, NY 10962, USA.

Cerebral Cortex (New York, N.Y. : 1991)
|March 7, 2008
PubMed
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Spatially directed attention enhances early visual processing, even at the initial arrival of information in the primary visual cortex (V1). This study demonstrates attentional modulation of the C1 component, challenging previous assumptions about V1 impenetrability.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Spatially directed attention is known to enhance visual processing.
  • The earliest cortical level affected by attention remains undetermined.
  • Previous studies suggested primary visual cortex (V1) activity is not modulated by attention, as the C1 component is highly variable.

Purpose of the Study:

  • To investigate if the earliest visual event-related potential component (C1) is modulated by spatial attention.
  • To determine if initial V1 activity is influenced by attentional biases.
  • To overcome C1 variability using individualized measurement techniques.

Main Methods:

  • Employed an individualized mapping procedure to optimize C1 measurement.
  • Utilized a spatial cueing task with Gabor stimuli and luminance detection.

Related Experiment Videos

  • Applied individually determined C1 measurement parameters in a follow-up session.

    • Main Results:

    • Demonstrated robust spatial attentional enhancement of the C1 component.
    • Observed attentional modulation of C1 as early as 57 ms, its onset.
    • Source analysis indicated attentional modulations originated in the striate cortex (V1).

    Conclusions:

    • Initial V1 activity is not impenetrable and is shaped by attentional biases.
    • Spatial attention modulates visual processing at the earliest cortical stages.
    • Individualized measurement is crucial for accurately assessing early visual processing dynamics.