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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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.
Direct Motor Pathways01:11

Direct Motor Pathways

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.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and the...
Hierarchy of Motor Control01:18

Hierarchy 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.
Functional Brain Systems: Reticular Formation01:13

Functional Brain Systems: Reticular Formation

The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
Within the reticular formation, there are several distinct nuclei that can be classified into three broad categories. The Raphe nuclei are located along the midline of the brainstem. They are primarily known for their role in synthesizing and releasing serotonin, a neurotransmitter involved in regulating mood, appetite, sleep, and circadian rhythms. The...
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...
Indirect Motor Pathways01:22

Indirect 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...

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Non-Invasive Modulation and Robotic Mapping of Motor Cortex in the Developing Brain
08:26

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Published on: July 1, 2019

Directed functional connectivity matures with motor learning in a cortical pattern generator.

Nancy F Day1, Kyle L Terleski, Duane Q Nykamp

  • 1Department of Neuroscience, The University of Minnesota, Twin Cities, Minnesota, USA.

Journal of Neurophysiology
|November 24, 2012
PubMed
Summary
This summary is machine-generated.

Researchers discovered a directional neural network in the HVC (proper fundus) of zebra finches, crucial for sequential motor skills like birdsong. This network matures during learning, enabling stereotyped vocalizations.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Animal Behavior

Background:

  • Sequential motor skills are thought to be encoded by feedforward neural networks.
  • Evidence for an anatomical map of activation sequences in motor control circuits, specifically directed functional connectivity, has been lacking.
  • The HVC (proper fundus) region in songbirds is a proposed pattern generator for birdsong, with axons oriented along the rostrocaudal axis.

Purpose of the Study:

  • To investigate the presence and organization of sequential neural activity within the HVC region of zebra finches.
  • To determine if directed functional connectivity exists and if it correlates with vocal learning and stereotyped song production.
  • To compare network directionality in adult male zebra finches with stereotyped songs versus juveniles with variable songs.

Main Methods:

  • Utilized four-tetrode recordings to assess the activity of neuronal ensembles along the rostrocaudal HVC axis in anesthetized zebra finches.
  • Analyzed neuronal firing sequences and functional connectivity patterns in relation to the rostrocaudal orientation.
  • Compared neural network directionality between adult males and juveniles.

Main Results:

  • Identified an axial, polarized neural network in adult male zebra finches where sequential activity is directionally organized along the rostrocaudal axis.
  • Observed principal neurons firing in rostrocaudal order, preceding rostral interneurons, suggesting a traveling wave of inhibition.
  • Found significantly less evidence for network directionality in juveniles compared to adults, correlating with song variability.

Conclusions:

  • The HVC contains a functionally directed network with sequential activity organized along the rostrocaudal axis, maturing during sensorimotor learning.
  • This directed network likely underlies the precise vocal patterning required for stereotyped song production in adult male zebra finches.
  • The findings provide evidence for a neural mechanism supporting learned sequential motor skills.