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Grab it! Biased attention in functional hand and tool space.

Catherine L Reed1, Ryan Betz, John P Garza

  • 1University of Denver, Denver, Colorado, USA. clreed@cmc.edu

Attention, Perception & Psychophysics
|January 5, 2010
PubMed
Summary

Spatial attention is influenced by the grasping function of hands and tool use. Faster responses to targets occurred within the functional space of the hand or a rake, suggesting an embodied attention model.

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Area of Science:

  • Cognitive Neuroscience
  • Human Motor Control
  • Visual Attention

Background:

  • Spatial attention allocation is crucial for sensorimotor interactions.
  • The influence of object affordances and functional properties on attention remains an active area of research.
  • Embodied cognition theories suggest that perception and action are deeply intertwined.

Purpose of the Study:

  • To investigate whether the functional properties of the human hand and tools shape spatial attention.
  • To determine if the 'grasping space' of the hand and the functional space of a tool extend attentional facilitation.
  • To explore the neural underpinnings of tool use in modulating spatial attention.

Main Methods:

  • Utilized a visual-orienting paradigm with predictable lateral cues across four experiments.
  • Manipulated the placement of hands or tools near potential target locations.
  • Measured reaction times to targets appearing in different spatial regions relative to the hand/tool.

Main Results:

  • Faster responses were observed for targets within the hand's grasping space (near the palm) and a rake's functional space (near the prongs).
  • Attentional facilitation was specific to the functional interaction zones, not general proximity.
  • No interaction was found between the spatial bias and cue validity effects.

Conclusions:

  • The functional topology of facilitated space around the hand is shaped by its grasping function.
  • Functional experience with tools can flexibly extend this facilitated spatial representation.
  • Findings support embodied cognition and suggest a neurally based model of spatial attention incorporating bimodal neuron principles.