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Related Experiment Videos

Passive, active and intra-active (self) touch.

S J Bolanowski1, R T Verrillo, F McGlone

  • 1Institute for Sensory Research, Syracuse University, NY 132444, USA. sandy_bolanowski@isr.syr.edu

Somatosensory & Motor Research
|January 13, 2000
PubMed
Summary
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Perceived object size during intra-active touch depends on the body site. Glabrous skin contact influences size perception, unlike hairy skin, suggesting distinct tactile mechanisms.

Area of Science:

  • Neuroscience
  • Somatosensation
  • Haptics

Background:

  • The perception of object properties, like size, is influenced by sensory input.
  • Intra-active touch, a novel form of tactile interaction, involves active movement of an object across a passively touched body surface.

Purpose of the Study:

  • To investigate how the passively touched body site affects the perceived size of an object during intra-active touch.
  • To determine if the type of skin (glabrous vs. hairy) influences size perception in intra-active touch.

Main Methods:

  • Magnitude estimation of steel ball size during active rolling (scripting) between the fingertip and various body sites (thumb, thenar eminence, forearm).
  • Experiments were conducted where subjects either performed scripting on another person or had an experimenter perform it on them.

Related Experiment Videos

  • Decoupling of active and passive tactile information was achieved by varying the interaction between active and passive body sites.

    • Main Results:

    • Perceived size of the steel balls was dependent on the body part passively receiving the touch.
    • When the passive surface was glabrous skin (hands), it contributed to the perceived size.
    • When the passive surface was hairy skin (forearm), there was no effect on perceived size, indicating different tactile processing.

    Conclusions:

    • The perceived size of objects during intra-active touch is modulated by the characteristics of the passively contacted skin.
    • Distinct neural mechanisms underlie intra-active touch involving glabrous-on-glabrous versus glabrous-on-hairy skin interactions.
    • These findings highlight the complex interplay between active and passive somatosensory information in shaping tactile perception.