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Related Experiment Videos

What vs. where in touch: an fMRI study.

Catherine L Reed1, Roberta L Klatzky, Eric Halgren

  • 1Department of Psychology, University of Denver, 2155 S. Race St., Denver, CO 80208, USA. creed@du.edu

Neuroimage
|April 6, 2005
PubMed
Summary
This summary is machine-generated.

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Human brains process touch information through distinct pathways, similar to vision. One stream handles object identity ("what"), while another processes spatial location ("where"), suggesting a general brain organization principle.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Sensory Processing

Background:

  • Cortical visual processing involves distinct ventral ("what") and dorsal ("where") streams.
  • It remains unclear if similar functional dissociations exist in human somatosensory processing.

Purpose of the Study:

  • To investigate whether separate "what" and "where" processing streams exist in human somatosensory (touch) perception.
  • To determine if the modality-general principle of distinct processing streams applies to tactile information.

Main Methods:

  • Subjects performed tactile object recognition (TOR) while ignoring location, and tactile object localization (LOC) while ignoring identity, using identical stimuli and hand movements.
  • A matched-movement control task was employed to isolate higher-level cognitive activity from sensorimotor input.

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Main Results:

  • Tactile object recognition (TOR) activated frontal pole, inferior parietal, and prefrontal regions associated with feature integration and naming.
  • Tactile object localization (LOC) activated superior parietal areas linked to spatial processing.
  • Distinct neural activations confirmed separate processing streams for object identity and spatial location in somatosensation.

Conclusions:

  • Somatosensory processing, like visual processing, is organized into distinct "what" (object identity) and "where" (spatial location) streams.
  • This dissociation appears to be a modality-general organizational principle within the human brain.