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Related Concept Videos

Somatosensation01:33

Somatosensation

36.7K
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.
36.7K
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

301
Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
301

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Related Experiment Video

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Testing Tactile Masking between the Forearms
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Hello from the other side: Robust contralateral interference in tactile detection.

Flor Kusnir1, Slav Pesin1, Ayelet N Landau2

  • 1Departments of Psychology and Cognitive Science, The Hebrew University of Jerusalem, Jerusalem, Israel.

Attention, Perception & Psychophysics
|October 23, 2023
PubMed
Summary
This summary is machine-generated.

Simultaneous touch sensations from different body parts are automatically combined, even when one is meant to be ignored. This suggests tactile inputs are processed together early in the somatosensory system.

Keywords:
Change detectionInterferencePsychophysicsSomatosensationTactile detection

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Area of Science:

  • Neuroscience
  • Somatosensory system
  • Tactile perception

Background:

  • The human body constantly receives diverse tactile inputs from various locations.
  • Understanding how the brain integrates or separates simultaneous tactile information is crucial for explaining tactile cognition.

Purpose of the Study:

  • To investigate the impact of irrelevant tactile stimulation on tactile change detection.
  • To characterize the principles governing interference effects from simultaneous, non-target tactile sensations.

Main Methods:

  • Participants detected intensity changes in a target vibrotactile stimulus.
  • Irrelevant vibrotactile stimulation was simultaneously presented to other body sites.
  • Parametric variations in target detectability, stimulation site, and irrelevant stimulus strength were employed.

Main Results:

  • Irrelevant tactile stimulation significantly interfered with tactile change detection across different body sites.
  • Interference effects were minimally dependent on exogenous attentional capture.
  • Tactile perception was proportional to the combined bilateral signal, suggesting automatic integration.

Conclusions:

  • Bilateral tactile inputs are automatically combined, likely early in somatosensory processing.
  • Attentional selection processes have limited ability to prevent this integration.
  • The findings shed light on the fundamental principles of tactile sensory integration.