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Multisensory spatial representations in eye-centered coordinates for reaching.

Alexandre Pouget1, Jean Christophe Ducom, Jeffrey Torri

  • 1Department of Brain and Cognitive Sciences, University of Rochester, Rochester, NY 14627, USA. alex@bcs.rochester.edu

Cognition
|January 30, 2002
PubMed
Summary
This summary is machine-generated.

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Humans use a shared eye-centered coordinate system for reaching, regardless of sensory input. This spatial representation is updated with eye and head movements, highlighting vision's role in perception.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Human Perception

Background:

  • Humans can reach for objects using vision, hearing, or touch.
  • Object location is typically recoded into a joint-centered frame of reference across senses.

Purpose of the Study:

  • To investigate if a shared frame of reference beyond joint-centered coordinates exists for reaching targets.
  • To determine if spatial information is encoded in eye-centered coordinates across different sensory modalities.

Main Methods:

  • Participants performed reaching tasks with visual, auditory, proprioceptive, and imaginary targets.
  • Eye and head movements were tracked during the tasks.
  • The spatial encoding of targets was analyzed in relation to eye-centered coordinates.

Related Experiment Videos

Main Results:

  • Target locations were encoded in eye-centered coordinates, irrespective of the sensory modality.
  • This eye-centered representation was dynamically updated following eye and head movements.
  • This updating occurred even when visual feedback was absent.

Conclusions:

  • A shared eye-centered frame of reference is utilized for planning reaches across multiple sensory modalities.
  • The continuous updating of this eye-centered representation suggests a significant role for vision in spatial awareness and action planning.
  • This finding challenges previous assumptions about the necessity of visual information for computing reaching commands.