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Related Experiment Videos

Haptic study of three-dimensional objects activates extrastriate visual areas.

Thomas W James1, G Keith Humphrey, Joseph S Gati

  • 1CIHR Group for Action and Perception, Psychology Department, The University of Western Ontario, London, Canada.

Neuropsychologia
|May 7, 2002
PubMed
Summary
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The brain uses visual processing areas for touch-based object recognition. Prior touch experience enhances visual processing of objects, suggesting shared neural pathways for both senses.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Sensory Perception

Background:

  • Object recognition primarily relies on the visual system in humans and primates.
  • Haptic exploration (sense of touch) can also recognize objects, but its processing mechanisms are debated.
  • It is hypothesized that haptic perception may utilize visual processing pathways.

Purpose of the Study:

  • To investigate the interaction between visual and haptic systems in object recognition.
  • To determine if haptic exploration activates brain regions typically associated with visual processing.
  • To examine the effects of cross-modal (haptic-to-visual) priming on brain activation.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.

Related Experiment Videos

  • Participants studied novel 3D clay objects through either visual or haptic exploration.
  • Brain activation was measured while participants viewed primed (visually or haptically) and non-primed objects, and explored non-primed objects haptically.

    • Main Results:

    • Both visual and haptic exploration of objects activated several brain regions, including overlapping activation in the middle occipital area (MO).
    • Viewing objects that were previously explored haptically (haptic priming) or visually (visual priming) led to increased activation in the MO and lateral occipital area (LO) compared to non-primed objects.
    • Haptic exploration activated somatosensory cortex as well as occipital cortex areas involved in visual processing.

    Conclusions:

    • Haptic exploration of objects engages brain regions typically associated with visual processing, particularly in the occipital cortex.
    • Prior haptic experience enhances subsequent visual processing of the same objects, indicating neural plasticity and interaction between sensory modalities.
    • The findings suggest that the brain's ventral visual pathway, crucial for visual object recognition, is also utilized for haptic object perception.