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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...
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,...
Overview of Somatic Sensory Pathways01:29

Overview of Somatic Sensory Pathways

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...
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.
Long-term Potentiation01:25

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...
Long-term Potentiation01:35

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.

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Association learning drives synaptic plasticity at feedforward synapses in somatosensory cortex.

Joseph A Christian1, Eunsol Park1,2, Alison L Barth1

  • 1Department of Biological Sciences and Center for Neural Basis of Cognition, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, United States.

Cerebral Cortex (New York, N.Y. : 1991)
|June 5, 2026
PubMed
Summary

Sensory cortex synapses change during learning. Reward prediction accuracy, not just experience, drives potentiation or depression in feedforward circuits, revealing plasticity mechanisms.

Keywords:
electrophysiologyexcitatory synapseshigh-throughput trainingquantal analysissuperficial layers

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Sensory Cortex Function

Background:

  • Neocortical synapses undergo plasticity during learning, but input and target specificity remain unclear.
  • Feedforward synapses in sensory cortex have critical periods and are thought to resist later plasticity.
  • The impact of learning, especially causal association tasks, on these feedforward synapses is largely uninvestigated.

Purpose of the Study:

  • To investigate whether feedforward synapses in the barrel cortex can be altered by training in a whisker-dependent association task.
  • To determine the role of reward-prediction accuracy in driving synaptic changes in sensory cortex feedforward pathways.

Main Methods:

  • Pathway-specific optogenetic stimulation in freely-moving mice.
  • Analysis of quantal excitatory postsynaptic currents (EPSCs) in layer 2/3 (L2/3) pyramidal neurons.
  • Comparison between true training, pseudotraining (decoupled stimuli/rewards), and environmental enrichment.

Main Results:

  • Training induced rapid, transient potentiation of layer 4 (L4) to L2/3 inputs, without altering thalamocortical inputs to L4.
  • Pseudotraining led to depression of L4-L2/3 quantal EPSCs.
  • Environmental enrichment did not affect quantal EPSC amplitude, suggesting reward prediction accuracy is the key factor.

Conclusions:

  • Feedforward plasticity in primary sensory cortex is driven by reward-prediction accuracy during goal-directed tasks.
  • Sensory circuits exhibit distinct synaptic changes (potentiation/depression) based on stimulus-reward contingency.
  • These findings highlight the sensitivity of feedforward sensory pathways to the predictive value of sensory information.