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Related Experiment Videos

Interactions between attention and perceptual grouping in human visual cortex.

W Khoe1, E Freeman, M G Woldorff

  • 1Department of Neurosciences, University of California, San Diego, La Jolla, CA 92093-0608, USA. wkhoe@sdepl.ucsd.edu

Brain Research
|February 28, 2006
PubMed
Summary
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Attention enhances visual perception through later processing stages, not early signals from V1. Contextual cueing effects on visual event-related potentials (ERPs) indicate attention modulates visual cortex activity after 180 ms.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • Attention significantly influences visual detection and discrimination.
  • Contextual cueing improves target detection when flanker stimuli provide relevant information.
  • The neural basis of attentional modulation in early visual processing remains debated.

Purpose of the Study:

  • To investigate the timing and neural sources of contextual cueing effects on visual perception.
  • To determine if attention modulates early visual signals from V1 or later visual cortex processing.
  • To examine the role of visual event-related potentials (ERPs) in understanding attentional effects.

Main Methods:

  • Recording visual event-related potentials (ERPs) during a dual-task paradigm.

Related Experiment Videos

  • Presenting a central Gabor stimulus with collinear or orthogonal flanking stimuli.
  • Measuring contrast discrimination performance and ERPs under attended conditions.

    • Main Results:

    • Attention to collinear flankers improved central Gabor contrast discrimination.
    • ERPs showed a significant difference between attended collinear and orthogonal flankers at 180-250 ms latency.
    • No contextual cueing effects were observed in ERPs with latencies shorter than 180 ms.

    Conclusions:

    • Attentional modulation of visual processing via contextual cueing occurs at later stages than early V1 afferent signals.
    • The findings suggest that attention influences neuronal lateral interactions in visual cortex through longer-latency, possibly re-entrant, pathways.
    • While V1 may be involved, its role in attentional modulation of lateral interactions likely has a longer time course than previously hypothesized.