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Related Concept Videos

Diencephalon: Thalamus and Information Relay01:27

Diencephalon: Thalamus and Information Relay

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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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Indirect Motor Pathways01:22

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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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Brainstem01:19

Brainstem

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The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
The Midbrain
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Motor and Sensory Areas of the Cortex01:14

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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.
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Direct Motor Pathways01:11

Direct Motor Pathways

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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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Somatosensory, Motor, and Association Cortex01:23

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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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Related Experiment Video

Updated: Jan 15, 2026

Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia
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Superior Colliculus Projections Drive Dopamine Neuron Activity and Movement But Not Value.

Carli L Poisson1,2,3, Izzabella K Green1,2,3,4, Gretchen M Stemmler1,2

  • 1Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 14, 2025
PubMed
Summary

The superior colliculus (SC) influences dopamine (DA) neurons in the ventral tegmental area (VTA) and substantia nigra (SNc) to control head turning for sensorimotor learning, rather than reward processing.

Keywords:
dopaminelearningmovementpavloviansensorysuperior colliculus

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Area of Science:

  • Neuroscience
  • Sensory processing
  • Dopamine pathways

Background:

  • Animals integrate sensory information for survival, with dopamine (DA) neurons in the ventral tegmental area (VTA) and substantia nigra (SNc) crucial for cue-outcome associations.
  • The integration of sensory input into DA pathways remains poorly understood, despite the superior colliculus (SC) receiving direct visual input and potentially relaying information to DA neurons.

Purpose of the Study:

  • To investigate the anatomical and functional connections between the SC and the VTA/SNc in rats.
  • To determine the role of SC projections to the VTA/SNc in behavior, reward, and sensorimotor learning.

Main Methods:

  • Anatomical tracing to map SC projections to the VTA/SNc.
  • In vivo electrophysiology to record SC neuron activity and its effect on VTA/SNc neurons.
  • Optogenetic stimulation of SC→VTA/SNc pathways and DA neurons receiving SC input in Pavlovian conditioning and reinforcement paradigms.

Main Results:

  • SC neurons densely project to and excite DA and GABA neurons in the VTA/SNc.
  • Activation of SC→VTA/SNc pathways did not support primary reinforcement or produce place preference/avoidance.
  • Stimulation of SC→VTA/SNc neurons primarily evoked head turning, with intensity increasing upon repeated stimulation.

Conclusions:

  • SC projections to the VTA/SNc modulate DA neuron activity to control head movements, contributing to sensorimotor learning and attentional switching.
  • This circuit preferentially engages motor responses over reward processing, highlighting a distinct role in orienting behaviors.