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Related Experiment Videos

Measuring time to awareness.

U Castiello1, M Jeannerod

  • 1Fisiologia Umana, Universita di Parma, Italy.

Neuroreport
|December 1, 1991
PubMed
Summary
This summary is machine-generated.

The brain processes visual changes and initiates motor actions through separate pathways. Subjective awareness of visual events occurs 150 ms after the motor response begins.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Understanding the neural basis of rapid visual-motor integration is crucial for explaining human perception and action.
  • Investigating the temporal relationship between motor execution and subjective awareness provides insights into cognitive processing.
  • Previous research suggests distinct pathways for sensory processing and conscious perception.

Purpose of the Study:

  • To measure the timing of motor and subjective responses to a visual event during a reaching movement.
  • To determine the temporal lag between motor correction and conscious perception of visual change.
  • To explore the neural underpinnings of this temporal dissociation.

Main Methods:

  • Normal subjects performed a reaching movement towards a visual object.

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  • The object's apparent expansion signaled a visual event.
  • Motor response was defined by trajectory correction; subjective response by vocalization upon awareness.

    • Main Results:

    • The subjective report of visual change occurred significantly later than the motor response, with a mean lag of 150 ms.
    • Control experiments confirmed that the two responses did not interfere with each other.
    • This temporal difference was consistent across subjects.

    Conclusions:

    • The findings support a dual-pathway model for processing object-related visual information.
    • Motor responses are initiated before conscious awareness of visual changes.
    • This temporal dissociation highlights distinct neural routes for action and perception.