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Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control
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Attentional control: temporal relationships within the fronto-parietal network.

Sarah Shomstein1, Dwight J Kravitz, Marlene Behrmann

  • 1Department of Psychology, George Washington University, Washington, DC 20015, United States. shom@gwu.edu

Neuropsychologia
|March 6, 2012
PubMed
Summary

Frontal cortex areas initiate visual attention shifts earlier than parietal areas. This early frontal engagement likely triggers a cascade, enabling successful attentional modulation of sensory information.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Attention

Background:

  • Selective attention relies on a fronto-parietal network, including frontal cortex, posterior parietal cortex, and visual sensory regions.
  • While neuroimaging studies have elucidated regional contributions to visual attention, the temporal dynamics between these areas remain poorly understood.

Purpose of the Study:

  • To investigate the temporal relationships between frontal and parietal regions during spatial shifts of visual attention.
  • To determine the precise timing of neural events associated with initiating an attentional shift.

Main Methods:

  • Utilized a rapid serial visual presentation (RSVP) paradigm with two letter streams.
  • Employed a psychophysics approach to precisely measure the time course of attention shifts.
  • Recorded event-related potentials (ERPs) time-locked to the initiation of spatial attention shifts.

Main Results:

  • Event-related potentials indicated that shifts of attention were detected earlier over frontal electrodes compared to parietal electrodes.
  • Early frontal activity was significantly correlated with successful shifts in attention.
  • This suggests a leading role for frontal areas in initiating attentional reorienting.

Conclusions:

  • Frontal cortical areas are engaged early in the process of executing an attentional shift.
  • This early frontal activation likely initiates a cascade within the fronto-parietal network.
  • The findings support a model where frontal regions orchestrate attentional shifts, modulating sensory processing in posterior areas.