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Spatial modulation of tactile temporal-order judgments.

David I Shore1, Kellie Gray, Emily Spry

  • 1Department of Psychology, Neuroscience & Behaviour, McMaster University, Hamilton, Ontario, Canada. dshore@mcmaster.ca

Perception
|November 29, 2005
PubMed
Summary

Posture significantly impacts tactile temporal processing. Greater hand separation (hands-far posture) improved tactile perception accuracy, suggesting a shift from skin-centered to external reference frames for tactile information.

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Area of Science:

  • Neuroscience
  • Psychology
  • Sensory Perception

Background:

  • Tactile temporal processing, the ability to discern the order of touch stimuli, is crucial for interaction with the environment.
  • Previous models suggested attention-switching mechanisms influence temporal-order judgments, potentially affected by posture.
  • Limited research exists on how body posture influences the precision of tactile timing.

Purpose of the Study:

  • To investigate the influence of body posture on tactile temporal processing.
  • To determine if tactile temporal precision differs between hands-close and hands-far postures.
  • To explore the reference frame (skin-centered vs. external) used in tactile temporal judgments.

Main Methods:

  • Three experiments were conducted in darkness involving tactile stimuli presented to index fingers or thumbs.

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  • Participants adopted either a hands-close or hands-far posture and judged which of two stimuli was perceived first.
  • Response modalities (hand vs. foot) and digit-stimulation pairings (same vs. different digits) were varied.

    • Main Results:

    • Just-noticeable differences in temporal order judgments were significantly smaller in the hands-far posture across all experiments.
    • This advantage for the hands-far posture was observed for both hand and foot responses.
    • The benefit of the hands-far posture was specific to trials where the same digit on each hand was stimulated.

    Conclusions:

    • Greater physical separation between hands enhances tactile temporal precision.
    • Findings challenge attention-switching models and suggest a rapid, automatic transformation of tactile representations.
    • Tactile processing may utilize an external, body-centered or allocentric reference frame, especially when hands are distant.