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Haptic shape discrimination and interhemispheric communication.

Catherine J Dowell1, J Farley Norman2, Jackie R Moment1

  • 1Western Kentucky University, Department of Psychological Sciences, Ogden College of Science and Engineering, Bowling Green, Kentucky, 42101-2030, USA.

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|January 12, 2018
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Summary
This summary is machine-generated.

Bimanual haptic exploration is as effective as unimanual for shape discrimination, even with interhemispheric communication. However, performance decreases with simultaneous comparisons and is reduced in older adults.

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Area of Science:

  • Neuroscience
  • Human Perception
  • Somatosensory System

Background:

  • Previous research suggested unimanual exploration is superior for haptic shape discrimination.
  • This was attributed to shape comparison being more effective when utilizing only one cerebral hemisphere.

Purpose of the Study:

  • To investigate if bimanual haptic exploration is as effective as unimanual exploration for object shape discrimination.
  • To determine the impact of simultaneous versus successive exploration on bimanual performance.
  • To assess the effect of age on haptic shape discrimination abilities.

Main Methods:

  • Participants performed haptic shape discrimination tasks using unimanual and bimanual exploration.
  • Objects included naturally shaped solid objects (bell peppers) and cylindrical surfaces.
  • Experiments compared successive and simultaneous bimanual exploration, and assessed performance across age groups.

Main Results:

  • Bimanual haptic exploration was found to be as effective as unimanual exploration for shape discrimination.
  • Successive bimanual exploration yielded high shape discriminability, but simultaneous comparisons led to performance deterioration.
  • Older adults exhibited moderately reduced shape discrimination abilities compared to younger adults, irrespective of exploration method.

Conclusions:

  • Haptic shape comparison does not necessarily require a reduction in ability when interhemispheric communication is involved.
  • Interhemispheric interference or the cognitive load of attending to multiple objects may impair simultaneous bimanual shape discrimination.
  • Age-related decline in somatosensory processing affects haptic shape discrimination abilities.