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Related Concept Videos

Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

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 the...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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.
Somatosensation01:33

Somatosensation

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.
Association Areas of the Cortex01:21

Association Areas of the Cortex

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,...
Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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 posterior columns...
Indirect Motor Pathways01:22

Indirect Motor Pathways

The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...

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Related Experiment Video

Updated: Jul 1, 2026

Assessing Corticospinal Excitability During Goal-Directed Reaching Behavior
05:05

Assessing Corticospinal Excitability During Goal-Directed Reaching Behavior

Published on: December 2, 2022

Retrosplenial cortex enables context-dependent goal-directed sensorimotor transformation.

Pol Bech1, Robin F Dard1, Jules Lebert1

  • 1Laboratory of Sensory Processing, Brain Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.

Elife
|June 29, 2026
PubMed
Summary
This summary is machine-generated.

Mice learned to adjust whisker responses based on context cues. The retrosplenial cortex (RSC) plays a key role in this context-dependent sensory processing, integrating information before other cortical areas.

Keywords:
context-dependent sensory processingfrontal cortexmouseneuroscienceoptical imagingretrosplenial cortexsomatosensory cortexwhisker sensory perception

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Area of Science:

  • Neuroscience
  • Sensory Processing
  • Behavioral Neuroscience

Background:

  • Dynamic adjustment of behavioral responses to stimuli based on context is crucial for animal survival.
  • Understanding the neural mechanisms of context-dependent sensory processing is essential.

Purpose of the Study:

  • To investigate the neural basis of context-dependent sensory processing.
  • To identify brain regions involved in integrating contextual cues with sensory information.

Main Methods:

  • Developed a behavioral task where mice modified whisker deflection responses based on a continuous contextual cue.
  • Utilized unbiased optogenetic inactivation mapping to identify task-relevant brain regions.
  • Employed widefield calcium imaging to observe neuronal activity patterns.
  • Combined optogenetic inactivation with calcium imaging to establish causal links.

Main Results:

  • Neuronal activity in sensory and motor cortices was vital for task execution.
  • The retrosplenial cortex (RSC) unexpectedly showed a significant role in contextual integration.
  • RSC was the earliest dorsal cortical area to exhibit context discrimination following whisker stimulation.
  • Whisker motor cortex activity followed RSC in context discrimination.

Conclusions:

  • Identified key cortical nodes involved in context-dependent sensorimotor transformation.
  • Highlighted the retrosplenial cortex as a critical area for contextual integration in sensory processing.
  • Provided causal evidence for the role of RSC in sensorimotor processing influenced by context.