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01:28Major 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...
01:27Diencephalon: Thalamus and Information Relay
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 states or needs.
01:22Indirect 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...
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
01:15Equilibrium and Balance
The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
01:18Hierarchy of Motor Control
The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.
01:29The Vestibular System
The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.
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Related Experiment Video
Updated: May 11, 2026
07:08
Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
Published on: August 1, 2018
The primate cerebellum selectively encodes unexpected self-motion.
Jessica X Brooks1, Kathleen E Cullen
1Department of Physiology, Aerospace Medical Research Unit, McGill University, Montréal, QC H3G 1Y6, Canada.
Current Biology : CB
|May 21, 2013
Summary
The cerebellum distinguishes self-generated (reafference) from external (exafference) motion using a sensory prediction error signal. This computation allows neurons to selectively represent unexpected self-motion, challenging traditional views of cerebellar function.
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Area of Science:
- Neuroscience
- Computational Neuroscience
- Sensorimotor Integration
Background:
- Distinguishing self-generated (reafference) from external (exafference) sensory signals during self-motion is crucial for perception and behavior.
- The cerebellum is traditionally linked to motor learning and sensorimotor calibration.
- Sensory prediction errors during unexpected motion may underlie the reafference-exafference distinction.
Purpose of the Study:
- To investigate the neural mechanisms by which the cerebellum distinguishes reafference from exafference.
- To determine if cerebellar neurons encode unexpected self-motion through predictive computations.
- To challenge conventional understanding of the cerebellum's role in motor learning.
Main Methods:
- Recordings from cerebellar output neurons in monkeys during voluntary and applied self-motion.
- Analysis of neuronal responses to self-generated versus externally applied movements.
- Simultaneous presentation of reafferent and exafferent sensory stimuli.
Main Results:
- Individual cerebellar output neurons explicitly and selectively represent unexpected self-motion.
- Neuronal responses to self-generated movements are canceled, while responses to applied movements remain.
- Neurons accurately estimate the timing of exafference when experienced with reafference.
Conclusions:
- The cerebellum employs a predictive computation to cancel reafferent sensory consequences of self-generated movements.
- This mechanism provides an explicit solution for distinguishing self-generated from externally produced actions.
- Findings challenge the view that cerebellar sensory errors primarily serve motor learning, highlighting a role in distinguishing sensory experiences.