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Related Experiment Video

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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
13:00

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Published on: January 23, 2017

Spatial attention can modulate unconscious orientation processing.

Bahador Bahrami1, David Carmel, Vincent Walsh

  • 1Institute of Cognitive Neuroscience, University College London, Alexandra House, 17 Queen Square, London WC1N 3AR, UK. bbahrami@ucl.ac.uk

Perception
|December 11, 2008
PubMed
Summary
This summary is machine-generated.

Visual spatial attention influences even invisible stimuli, enhancing orientation adaptation. This suggests attention

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • Recent theories propose visual spatial attention exclusively impacts consciously perceived events.
  • Understanding the precise role of attention in visual processing, especially concerning awareness, remains a key research question.

Purpose of the Study:

  • To investigate the effects of sustained spatial attention on orientation-selective adaptation to stimuli rendered invisible.
  • To determine if spatial attention can modulate processing of non-conscious visual information.

Main Methods:

  • Employing prolonged interocular suppression to create invisible grating stimuli.
  • Measuring orientation-selective adaptation under conditions of sustained spatial attention versus no attention.
  • Testing stimulus effects at varying contrast levels, particularly peri-threshold.

Main Results:

  • Sustained spatial attention significantly augmented orientation-selective adaptation to invisible adaptor orientations.
  • The attentional effect was most pronounced for test stimuli at intermediate, peri-threshold contrast levels.
  • This finding contrasts with previous studies that may have used suprathreshold contrasts.

Conclusions:

  • Spatial attention can influence visual processing even when stimuli are not consciously perceived.
  • The contrast level of stimuli is critical in observing attentional effects on non-conscious processing.
  • A constrained hypothesis is proposed regarding the neuronal mechanisms of spatial attention with and without awareness.