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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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.
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....
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Vision01:24

Vision

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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.
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Somatosensory, Motor, and Association Cortex01:24

Somatosensory, Motor, and Association Cortex

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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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Visual System01:26

Visual System

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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...
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Association Areas of the Cortex01:21

Association Areas of the Cortex

5.7K
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,...
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Somatosensation01:33

Somatosensation

37.0K
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.
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Related Experiment Video

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Visualization of Cortical Modules in Flattened Mammalian Cortices
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Cortical maps as a fundamental neural substrate for visual representation.

Bruss Lima1, Maria M Florentino1, Mario Fiorani1

  • 1Programa de Neurobiologia, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil.

Progress in Neurobiology
|February 24, 2023
PubMed
Summary

Vision is not a passive representation but an active, constructive process. Early learning and interactions between perceptual and motor systems create our stable visual perception.

Keywords:
Primate electrophysiologyRemappingVisual representationsVisual systemVisual topography

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Visual perception involves complex processing across cortical areas.
  • Understanding the topographical organization of these areas is crucial.
  • Existing models debate whether vision is representational or constructive.

Purpose of the Study:

  • To investigate the topographical organization of cortical visual areas in primates.
  • To examine different types of visual maps.
  • To interpret findings within a representational framework for perception.

Main Methods:

  • Analysis of neurophysiological data.
  • Focus on topographical organization of cortical areas.
  • Examination of visual maps in the primate brain.

Main Results:

  • Findings do not support a strict representational model of vision.
  • Strong evidence indicates vision is an active, constructive process from early stages.
  • Interplay between perceptual and motor systems is learned early.

Conclusions:

  • Vision is an active and constructive process, not a faithful representation of the external world.
  • Early development and sensorimotor integration shape visual perception.
  • Fluid and stable visual perception arises from learned constructive processes.