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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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Role of Amygdala in Memory01:16

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The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
One of 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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Functional Brain Systems: Limbic System01:15

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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
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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:
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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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Amygdala and Cortex Relationships during Learning of a Sensory Discrimination Task.

David Levitan1, Ariel Gilad2

  • 1Department of Medical Neurobiology, Faculty of Medicine, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University of Jerusalem, Jerusalem 9112102, Israel.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 18, 2024
PubMed
Summary

Learning shapes brain activity, linking sensory input to rewards. Cortico-amygdala connections strengthen during a sensory discrimination task, with amygdala responses emerging and correlating with movement and reward anticipation.

Keywords:
basolateral amygdalacalcium imagingfiber photometrymouse modelwhisker systemwide-field imaging

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Learning and Memory

Background:

  • Cortical and subcortical regions exhibit complex dynamics during sensory learning.
  • The amygdala and cortex associate stimuli with rewards and are involved in motor responses.
  • The development of cortico-amygdala relationships during learning remains unclear.

Purpose of the Study:

  • To investigate the emergence of cortico-amygdala relationships during the learning of a sensory discrimination task.
  • To simultaneously record population dynamics in the cortex and amygdala during learning.

Main Methods:

  • Wide-field cortical imaging and fiber photometry were used in male mice.
  • Simultaneous recordings were made from the posterior cortex and either the basolateral amygdala (BLA) or central/medial amygdala (CEM).
  • Mice learned a whisker-dependent go/no-go task.

Main Results:

  • Before learning, only the cortex responded to sensation; amygdala showed no significant response.
  • With expertise, amygdala responses appeared early in the sensation period, increasing in CEM and decreasing in BLA.
  • Cortico-amygdala activity correlated with task-related movements, preceding licking by ~200 ms.

Conclusions:

  • Learning induces dynamic changes in cortico-amygdala interactions.
  • The central/medial amygdala (CEM) shows increased involvement, while the basolateral amygdala (BLA) shows decreased involvement in experts.
  • These neural changes likely facilitate the association of sensory stimuli with appropriate outcomes.