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Neural pathways in tactile object recognition.

E Deibert1, M Kraut, S Kremen

  • 1Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA. deiberte@neuro.wustl.edu

Neurology
|May 5, 1999
PubMed
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Tactile object recognition (TOR) involves visual systems, potentially accessing internal object representations. Brain regions like the visual cortex may aid in processing spatial information during TOR.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Neural substrates of tactile object recognition (TOR) remain unclear.
  • Peripheral somatosensory and motor mechanisms are implicated, but higher-order recognition pathways are undetermined.
  • Previous studies suggest involvement of both primate and human brain systems.

Purpose of the Study:

  • To further define brain regions involved in tactile object recognition (TOR).
  • To elucidate the neural pathways underlying TOR using functional MRI (fMRI).

Main Methods:

  • Functional MRI (fMRI) was used to study 11 healthy volunteers.
  • Participants performed a tactile object identification task.
  • A control condition involved distinguishing between rough and smooth textures.

Related Experiment Videos

Main Results:

  • TOR activation was observed in the calcarine and extrastriatal cortex, inferior parietal lobule, inferior frontal gyrus, and superior frontal gyrus-polar region.
  • Data suggest a widespread network activation during tactile object recognition.

Conclusions:

  • TOR may leverage visual system pathways to access internal object representations.
  • Parietal and inferior frontal regions might support a lexical strategy for object naming.
  • Frontal polar activation could be linked to visuospatial working memory or unusual object representations.
  • Findings suggest TOR involves a network integrating somatosensory, motor, visual, and lexical processing, with visual cortex involvement in spatial processing.