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Objects automatically potentiate action: an fMRI study of implicit processing.

J Grèzes1, M Tucker, J Armony

  • 1Wellcome Department of Imaging Neuroscience, University College London, 12 Queen Square, London WC1N 3BG, London, UK. jgrezes@fil.ion.ucl.ac.uk

The European Journal of Neuroscience
|June 26, 2003
PubMed
Summary
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Object perception automatically triggers motor actions, influencing grip responses. Brain imaging revealed specific neural network activations related to the compatibility between object affordances and task demands.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Motor Control

Background:

  • Object perception automatically primes potential actions (affordances) regardless of user intent.
  • Intrinsic object properties influence motor responses, creating compatibility or incompatibility with afforded actions.

Purpose of the Study:

  • To investigate how object properties affect motor responses using event-related fMRI.
  • To explore the neural basis of action selection influenced by object affordances and task demands.

Main Methods:

  • Event-related functional magnetic resonance imaging (fMRI) study.
  • Participants performed power or precision grip responses to natural/man-made and small/large objects.
  • Reaction times were measured for grip responses congruent or incongruent with object affordances.

Related Experiment Videos

Main Results:

  • Motor responses were significantly faster for congruent grip-action pairings and slower for incongruent ones.
  • fMRI data showed increased activation in the parietal, dorsal premotor, and inferior frontal cortex correlating with response compatibility.
  • Greater reaction time differences between congruent and incongruent trials corresponded to higher activation in these brain regions.

Conclusions:

  • The brain network comprising parietal, dorsal premotor, and inferior frontal cortex is involved in resolving competition between object-afforded actions and task-specified actions.
  • Object properties automatically influence motor planning, and the degree of this influence is reflected in neural activation patterns.