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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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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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Synesthesia01:27

Synesthesia

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Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
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Techniques of therapeutic communication I: Active Listening, Sharing Observations, Validation, and Using Touch01:15

Techniques of therapeutic communication I: Active Listening, Sharing Observations, Validation, and Using Touch

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The history of therapeutic communication can be traced back to Florence Nightingale, who emphasized the importance of developing trusting relationships with patients. She taught that the presence of nurses with patients results in therapeutic healing.
Therapeutic communication is not the same as social interaction. Social interaction has no goal or purpose and consists of casual information sharing, whereas therapeutic communication has a plan or purpose for the conversation. Therapeutic...
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Visual Agnosia01:12

Visual Agnosia

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

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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:
The receptor level:
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Related Experiment Video

Updated: Mar 29, 2026

Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS
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Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS

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Tactile asymbolia.

Daniel Talmasov1, Allan H Ropper2

  • 1Harvard Longwood Psychiatry Residency Training Program, Harvard Medical School, Boston, MA, USA; Department of Psychiatry, Brigham and Women's Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02215, USA; Department of Psychiatry, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia
|December 2, 2015
PubMed
Summary
This summary is machine-generated.

A patient with a right parietal lesion showed preserved line direction sense but lost the ability to recognize letters and numbers by touch (agraphesthesia). This suggests a higher-order somatosensory processing deficit in the parietal lobe.

Keywords:
Clinical neurologyGraphesthesiaNeurological exam findingsParietal cortexSomatosensory processing

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Area of Science:

  • Neuroscience
  • Somatosensory System
  • Neurology

Background:

  • Agraphesthesia is typically linked to impaired tactile line direction perception.
  • The somatosensory system processes touch, pressure, and proprioception.

Observation:

  • A patient with a right parietal lesion could identify line directions on skin but lacked graphesthesia for letters and numbers.
  • This patient could correctly identify lines, letters, and numbers drawn on paper.

Findings:

  • The patient exhibited isolated agraphesthesia for letters and numbers despite intact directional cutaneous kinesthesia.
  • This dissociation suggests a specific deficit in higher-order somatosensory processing within the right parietal lobe.

Implications:

  • The findings support a hierarchical organization of the human tactile cortex, similar to the visual cortex.
  • This case introduces the concept of "tactile asymbolia" to describe this specific sensory dissociation.