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Related Experiment Videos

Feeling with the mind's eye

K Sathian1, A Zangaladze, J M Hoffman

  • 1Department of Neurology, Emory University School of Medicine, Atlanta, GA 30322, USA.

Neuroreport
|February 14, 1998
PubMed
Summary

Tactile discrimination of grating orientation, which involves visual mental imagery, activates visual cortex areas. This suggests visuo-spatial processes are used to interpret tactile information.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Sensory Perception

Background:

  • Mental imagery is crucial for visual perception and relies on visual cortex activity.
  • Tactile discrimination of grating orientation may involve visual mental imagery.

Purpose of the Study:

  • To investigate if tactile discrimination of grating orientation recruits visual cortical areas.
  • To explore the neural basis of tactile perception involving visual imagery.

Main Methods:

  • H215O positron emission tomography (PET) scans were used in human participants.
  • Participants performed tactile discrimination tasks involving gratings presented to the index fingerpad.
  • A control task focused on grating dimensions while the experimental task focused on orientation.

Main Results:

  • Selective attention to grating orientation increased regional cerebral blood flow (rCBF) in the left parieto-occipital cortex.
  • This activation was significantly greater compared to the control task focusing on grating dimensions.

Conclusions:

  • The findings suggest that tactile orientation discrimination engages visual cortical areas.
  • This activation likely reflects the involvement of imagery-related visuo-spatial processes in tactile perception.

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