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Related Concept Videos

Somatosensation01:33

Somatosensation

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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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Lateralization01:28

Lateralization

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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Tactile and Chemical Senses01:27

Tactile and Chemical Senses

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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.
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Major Somatic Sensory Pathways01:28

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Somatosensory, Motor, and Association Cortex01:24

Somatosensory, Motor, and Association Cortex

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Overview of Somatic Sensory Pathways01:29

Overview of Somatic Sensory Pathways

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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
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Related Experiment Video

Updated: Nov 7, 2025

Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS
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Lateral asymmetry and tactile sensitivity.

K L Kaplan-Solms1, M M Saling

  • 1School of Psychology, University of the Witwatersrand, Johannesburg, South Africa.

Perceptual and Motor Skills
|August 1, 1988
PubMed
Summary
This summary is machine-generated.

This study investigated breast sensitivity asymmetry and found no support for the hypothesis that the left breast is more sensitive. The findings challenge the widely held belief in uniform left-side body sensitivity.

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Last Updated: Nov 7, 2025

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Psychology

Background:

  • A 1963 study suggested left female breast tactile sensitivity exceeds the right.
  • This asymmetry was hypothesized to explain leftward maternal cradling bias.
  • The current study aimed to replicate and verify these findings.

Purpose of the Study:

  • To replicate Weinstein's 1963 findings on breast tactile sensitivity.
  • To investigate the hypothesis linking breast sensitivity asymmetry to maternal cradling behavior.
  • To review existing literature on lateralized cutaneous sensitivity.

Main Methods:

  • Attempted replication of Weinstein's 1963 study on breast tactile sensitivity.
  • Literature review of studies on lateral distribution of cutaneous thresholds.
  • Analysis of experimental data regarding sensory perception lateralization.

Main Results:

  • Weinstein's findings regarding left breast sensitivity were not replicated.
  • Literature review revealed limited experimental support for uniform left-side body hypersensitivity.
  • No significant evidence was found to support the hypothesized breast sensitivity asymmetry.

Conclusions:

  • The hypothesis that the left female breast is more sensitive to tactile stimulation is not supported by this study.
  • The proposed link between breast sensitivity asymmetry and maternal cradling bias lacks empirical validation.
  • Existing literature does not consistently support the notion of uniform left-body hypersensitivity.