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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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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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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:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the...
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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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Association Areas of the Cortex01:21

Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Deviance Distraction and Stimulus-Specific Adaptation in the Somatosensory Cortex Reduce with Experience.

Newsha Ghasemi Nejad1,2, Gwendolyn English3,2, Athina Apostolelli3

  • 1Institute of Neuroinformatics, D-ITET, ETH Zurich and UZH, 8057 Zurich, Switzerland gnewsha@ethz.ch wolfger@ini.uzh.ch.

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Stimulus-specific adaptation (SSA) detects changes in sensory input. In mice, deviant whisker stimuli distracted visual task performance, with effects linked to SSA in deeper cortical layers, but this learning diminished with experience.

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Cognitive Science

Background:

  • Exogenous attentional control relies on detecting surprising sensory changes.
  • Stimulus-specific adaptation (SSA) is a proposed neural mechanism for change detection across sensory pathways.
  • The relationship between SSA and perceptual experience is not well understood.

Purpose of the Study:

  • To investigate how deviant sensory stimuli influence target signal detection.
  • To explore the neural mechanisms of deviance detection in the somatosensory cortex.
  • To assess the impact of stimulus-specific adaptation (SSA) on cross-modal perception.

Main Methods:

  • A behavioral cross-modal paradigm in mice performing a visual detection task.
  • Extracellular recordings from the primary somatosensory whisker cortex.
  • Presentation of task-irrelevant whisker stimuli as standard or deviant.

Main Results:

  • Deviant whisker stimuli caused a distraction effect: faster reaction times but worsened visual target detection.
  • Enhanced neuronal responses (multiunit activity and local field potentials) to deviant stimuli were observed due to SSA.
  • The correlation between behavioral distraction and neural responses was layer-specific, primarily in deeper cortical layers.
  • Task experience and statistical distractor learning reduced the layer-specific effect of SSA on perception.

Conclusions:

  • SSA contributes to deviance detection in the somatosensory cortex.
  • The neural processing of deviant stimuli impacts cross-modal perceptual performance.
  • Perceptual consequences of SSA are layer-specific and can be modulated by learning and experience.