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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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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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Related Experiment Video

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Creating Objects and Object Categories for Studying Perception and Perceptual Learning
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Where you look can influence haptic object recognition.

Rebecca Lawson1, Amy Boylan, Lauren Edwards

  • 1School of Psychology, University of Liverpool, Eleanor Rathbone Building, Bedford Street South, Liverpool, L69 7ZA, UK, rlawson@liv.ac.uk.

Attention, Perception & Psychophysics
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Summary

Turning your head towards an object improves tactile recognition, especially when your hand crosses your body midline. This suggests sensory inputs are remapped into an external coordinate system for better haptic perception.

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Area of Science:

  • Cognitive Neuroscience
  • Haptic Perception
  • Somatosensory Processing

Background:

  • Haptic recognition involves tactile and proprioceptive information.
  • The influence of body position on haptic perception is not fully understood.
  • Sensory remapping may play a role in integrating touch and body awareness.

Purpose of the Study:

  • To investigate how the relative position of objects and the body affects haptic object recognition.
  • To determine if head orientation influences tactile identification.
  • To explore the underlying sensory remapping mechanisms in haptic perception.

Main Methods:

  • Participants identified objects using touch with their right hand, positioned on the left or right of their body midline.
  • Head orientation (towards or away from the object) was manipulated while vision was occluded.
  • Object types included 2-D drawings, 3-D models, and real-world items.

Main Results:

  • Object recognition accuracy improved when participants turned their head towards the object.
  • This head-towards benefit was more pronounced when the hand crossed the body midline to explore objects on the contralateral side.
  • Haptic recognition was influenced by head position, even without visual feedback.

Conclusions:

  • Head orientation impacts haptic object recognition, suggesting sensory inputs are remapped into an external coordinate system.
  • The body midline and unusual limb positions can make this sensory remapping more challenging.
  • Haptic processing appears to integrate hand and head sensory information, potentially beyond simple egocentric or allocentric frames of reference.