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Visual processing and the bodily self.

Louise Whiteley1, Charles Spence, Patrick Haggard

  • 1Institute of Cognitive Neuroscience and Department of Psychology, University College London, 17 Queen Square, London, WC1N 3AR, UK. l.whiteley@ucl.ac.uk

Acta Psychologica
|May 15, 2007
PubMed
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Viewing your own body speeds up visual tasks, unlike neutral contexts. This effect is stronger for one's own body than another's, suggesting egocentric and interpersonal influences on body schema perception.

Area of Science:

  • Cognitive Neuroscience
  • Perception
  • Body Representation

Background:

  • The traditional view of body schema as a passive proprioceptive map is evolving.
  • Emerging research indicates body representations are dynamic, integrating multisensory input.
  • These representations can extend to include tools and indirect body information.

Purpose of the Study:

  • To investigate the origins of the facilitatory effect of body viewing on visual reaction times.
  • To determine if the effect is specific to one's own body versus another's body or a neutral context.

Main Methods:

  • Participants performed a visual discrimination task with stimuli presented on their own body, the experimenter's body, or a neutral background.
  • Stimuli were filmed and displayed in real-time via a projector.

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  • Controls were implemented for attention, biological saliency, and attribution of context.

    • Main Results:

    • A significant facilitatory effect on reaction times was observed when stimuli were presented on a real body.
    • This effect was strongest when stimuli were on the participant's own body.
    • An intermediate facilitatory effect was found for stimuli on the experimenter's body.

    Conclusions:

    • The facilitatory effect critically relies on the attribution of context to a real body.
    • Viewing one's own body enhances visual discrimination, likely due to a combination of egocentric and interpersonal factors.
    • Body schema perception is more complex and context-dependent than previously assumed.