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Related Experiment Videos

Confusing the mind by crossing the hands.

David I Shore1, Emily Spry, Charles Spence

  • 1Department of Psychology, McMaster University, Ontario, L8S 4K1, Hamilton, Canada. dshore@mcmaster.ca

Brain Research. Cognitive Brain Research
|June 14, 2002
PubMed
Summary
This summary is machine-generated.

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Crossing hands impairs tactile timing perception. This study found that judging the order of two touch sensations is significantly harder when hands are crossed, suggesting a spatial processing issue in the brain.

Area of Science:

  • Neuroscience
  • Sensory Perception
  • Human Factors

Background:

  • The brain processes sensory information from different body parts.
  • Spatial arrangements of limbs can influence sensory perception.

Purpose of the Study:

  • To investigate how hand posture affects tactile temporal order judgments (TOJs).
  • To differentiate between motor and perceptual contributions to crossed-hand deficits.

Main Methods:

  • Participants performed tactile TOJs with hands uncrossed and crossed.
  • Visual TOJs were also conducted to compare sensory modalities.
  • Just Noticeable Difference (JND) was used to quantify performance.

Main Results:

  • Tactile TOJ performance significantly worsened with hands crossed (JND=124 ms) compared to uncrossed (JND=34 ms).

Related Experiment Videos

  • Visual TOJ performance showed a smaller deficit with crossed hands (JND=36 ms vs. 31 ms).
  • Experienced observers and varied finger use did not mitigate the crossed-hand deficit.

    • Conclusions:

    • Hand crossing impairs tactile temporal discrimination, indicating a failure in representing near-simultaneous bimanual tactile stimuli.
    • The effect is primarily perceptual rather than motor, unlike visual processing.
    • This contrasts with efficient processing of singly-presented tactile stimuli.