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Related Experiment Videos

Peripheral neuropathy and object length perception by effortful (dynamic) touch: a case study.

Claudia Carello1, Jeffrey Kinsella-Shaw, Eric L Amazeen

  • 1Center for the Ecological Study of Perception and Action, University of Connecticut, Storrs, CT 06269-1020, USA. claudia.carello@uconn.edu

Neuroscience Letters
|August 4, 2006
PubMed
Summary
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A woman with sensory loss in one arm perceived object length by wielding them, demonstrating effortful touch can utilize mass moments for spatial perception. This nonvisual length perception matched controls, suggesting unique neural processing.

Area of Science:

  • Neuroscience
  • Haptics
  • Somatosensation

Background:

  • Nonvisual perception of object dimensions is crucial for interaction.
  • Effortful or dynamic touch, involving object manipulation, can provide spatial information.
  • The neural underpinnings of discriminative versus effortful touch are not fully understood.

Observation:

  • A patient with Arnold-Chiari Type 1 Malformation and a cervical syrinx, experiencing loss of discriminative touch in her left arm, participated in a study on nonvisual length perception.
  • The patient wielded weighted rods of varying lengths (45, 60, 80cm) using her insensate left arm and her intact right arm.
  • Despite lacking discriminative touch in her left arm, she could grasp and wield objects.

Findings:

  • Nonvisual length perception in the insensate left arm scaled with the rod's moment of inertia, mirroring performance in her intact right arm and unimpaired controls.

Related Experiment Videos

  • The patient's intact right arm demonstrated superior accuracy and reliability in nonvisual length perception compared to her insensate left arm.
  • Performance in the intact right arm was comparable to or better than the dominant arm of control participants.

    • Implications:

    • This study highlights the distinct neural mechanisms underlying discriminative and effortful touch.
    • The findings support the concept of 'numb touch' and suggest that deafferentation may lead to contralateral cortical enhancement.
    • Effortful touch can effectively exploit object properties like mass moments for spatial perception, even with impaired discriminative sensation.