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Related Concept Videos

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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Somatosensory, Motor, and Association Cortex01:23

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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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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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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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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G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
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Real-time Analysis of Gut-brain Neural Communication: Cortex wide Calcium Dynamics in Response to Intestinal Glucose Stimulation
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Dopamine gates sensory representations in cortex.

Neir Eshel1, Ju Tian2

  • 1Program in Neuroscience, MD-PhD Program, Harvard Medical School, Boston, Massachusetts Neir_Eshel@hms.harvard.edu.

Journal of Neurophysiology
|January 10, 2014
PubMed
Summary
This summary is machine-generated.

Dopamine enhances sensory processing in the prefrontal cortex (PFC) by increasing neural response gain. This effect in pyramidal neurons may occur through the inhibition of local interneurons, aiding information maintenance.

Keywords:
dopaminegatingprefrontal cortexworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Primate Neurophysiology

Background:

  • The prefrontal cortex (PFC) is crucial for maintaining sensory information, a function linked to dopamine.
  • Dopamine's precise role in modulating PFC activity for information maintenance requires further elucidation.

Purpose of the Study:

  • To investigate the direct effects of dopamine on sensory-evoked neural responses in the primate prefrontal cortex.
  • To explore the cellular mechanisms by which dopamine influences neuronal activity in the PFC.

Main Methods:

  • Local application of dopamine to the prefrontal cortex in awake, behaving monkeys.
  • Extracellular recordings of single-unit activity from prefrontal cortex neurons.
  • Analysis of sensory-evoked responses and neuronal gain.

Main Results:

  • Dopamine application significantly increased the gain of sensory-evoked responses in putative pyramidal neurons.
  • This increase in gain suggests enhanced signal transmission and processing of relevant sensory stimuli.
  • Evidence suggests dopamine may exert this effect by inhibiting local interneurons, disinhibiting pyramidal cells.

Conclusions:

  • Dopamine plays a key role in enhancing sensory information processing within the prefrontal cortex.
  • The findings support a mechanism where dopamine modulates neuronal gain via interneuron inhibition.
  • This study provides insights into the neurochemical basis of working memory and cognitive control.