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Related Concept Videos

Somatosensation01:33

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Haptic touch modulates size adaptation aftereffects on the hand.

Souta Hidaka1, Raffaele Tucciarelli2, Salma Yusuf2

  • 1Department of Psychology, Rikkyo University.

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Grasping objects significantly enhances haptic size aftereffects, influencing how we perceive object size. This suggests active touch, involving hand and finger movements, is crucial for size adaptation.

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Area of Science:

  • Psychology
  • Neuroscience
  • Human Perception

Background:

  • Size perception is influenced by haptic feedback from the skin.
  • Haptic size aftereffects occur after prolonged exposure to objects of different sizes.
  • The specific roles of tactile and kinesthetic components in haptic size aftereffects are not fully understood.

Purpose of the Study:

  • To investigate how different aspects of haptic touch influence size perception.
  • To determine the contribution of grasp and hand movements to haptic size aftereffects.

Main Methods:

  • Participants adapted to large and small spheres using one or both hands.
  • Test spheres were judged for size after adaptation under various conditions (grasping, resting, finger involvement).

Main Results:

  • Haptic size aftereffects were observed across different grasping conditions.
  • Grasping the object, even without finger involvement, produced stronger aftereffects than resting palms.
  • Repeated grasping and continuous grasp without movement also elicited significant aftereffects.

Conclusions:

  • The act of grasping plays a pivotal role in haptic size adaptation.
  • Active haptic interactions, particularly involving grasp, are critical for perceptual size aftereffects.
  • Future research should explore the neural mechanisms underlying grasp-dependent size perception.