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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.
Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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,...
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...
Parallel Processing01:20

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...

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A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
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The operating regime of local computations in primary visual cortex.

Marcel Stimberg1, Klaus Wimmer, Robert Martin

  • 1School of Computer Science and Electrical Engineering and Bernstein Center for Computational Neuroscience, Technische Universität Berlin, 10587 Berlin, Germany.

Cerebral Cortex (New York, N.Y. : 1991)
|February 18, 2009
PubMed
Summary

Neural circuits in the primary visual cortex (V1) operate in a balanced regime of excitation and inhibition. This balanced state, crucial for V1 function, makes cortical responses highly sensitive to modulation.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Local circuitry in the primary visual cortex (V1) exhibits spatially varying recurrent input properties.
  • Neuronal physiological characteristics systematically change with location in the orientation map.

Purpose of the Study:

  • To investigate how V1 neuronal tuning characteristics constrain the cortical operating regime.
  • To identify network models consistent with experimental observations in cat V1.

Main Methods:

  • Utilized firing rate and Hodgkin-Huxley network models.
  • Systematically varied recurrent excitation and inhibition strengths.
  • Tested a wide range of model classes against experimental data.

Main Results:

  • Found the strongest evidence for a balanced regime of recurrent excitation and inhibition dominating feed-forward input.
  • Results remained robust against variations in model assumptions.
  • Identified the most likely regime as being near "runaway excitation," sensitive to small parameter changes.

Conclusions:

  • The balanced recurrent input regime is critical for V1 function.
  • This operating regime enhances network dynamics sensitivity to modulation.
  • V1 network dynamics are poised near a critical state, impacting information processing.