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Related Experiment Video

Updated: Nov 26, 2025

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Spatial attention modulates earliest visual processing: An electrical neuroimaging study.

Alberto Zani1,2, Alice Mado Proverbio3,2

  • 1School of Psychology, Vita Salute San Raffaele University, Milan, Italy.

Heliyon
|December 9, 2020
PubMed
Summary
This summary is machine-generated.

Shifting spatial attention influences early visual processing in the brain. This study used electroencephalography (EEG) to show attention affects visual cortex activation, impacting response times.

Keywords:
Behavioral testCognitionCognitive neuroscienceCognitive psychologyERPsEarly attentional selectionExtrastriate occipital cortexHigh temporal and spatial localization resolutionIntracranial source reconstructionNervous systemNeuroanatomyPreparatory biasSpatial anisotropyStriate occipital cortexSystems neuroscienceVisuospatial orienting of attention

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Electrophysiology

Background:

  • Shifting visuospatial attention is known to modulate sensory processing across visual pathways.
  • Previous research on attention's effect on striate cortices activation has yielded inconsistent findings.
  • The precise timing and location of attention's influence on early visual processing remain debated.

Purpose of the Study:

  • To investigate if shifting spatial attention across the horizontal meridian affects early striate cortex activation.
  • To examine the latency and topographical distribution of neural responses to attentional cues.
  • To correlate electrophysiological findings with behavioral measures of target detection.

Main Methods:

  • Electroencephalography (EEG) was used to record brain activity in 17 participants.
  • Event-related potentials (ERPs) and their neural sources were analyzed.
  • Participants responded to visual targets preceded by either attention-directing or neutral cues.

Main Results:

  • Attention-directing cues elicited distinct polarity inversions at occipital-parietal electrodes between 60-90 ms.
  • Neural source analysis implicated both striate and extrastriate cortices in early visual processing.
  • Behavioral responses were faster for targets preceded by local cues and presented in the upper visual hemifield.

Conclusions:

  • Attention shifts significantly impact early sensory processing within the visual cortex.
  • Findings support the hypothesis that attention modulates neural activity at the earliest stages of visual processing.
  • The study provides electrophysiological evidence for the role of striate cortices in attentional modulation.