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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...
The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

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Related Experiment Video

Updated: May 12, 2026

Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging
11:24

Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging

Published on: December 12, 2012

Population codes in the visual cortex.

Seiji Tanabe1

  • 1Department of Neuroscience, Albert Einstein College of Medicine, Yeshiva University, 1410 Pelham Pkwy S., Room 822, Bronx, NY 10461, USA. seiji.tanabe@einstein.yu.edu

Neuroscience Research
|April 2, 2013
PubMed
Summary
This summary is machine-generated.

This review introduces population coding, explaining how neural activity across brain areas represents sensory information. Advances in multi-neuronal recording are enabling tests of these theories in systems neuroscience.

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Last Updated: May 12, 2026

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Area of Science:

  • Systems neuroscience
  • Computational neuroscience
  • Sensory processing

Background:

  • Sensory events activate widespread neural populations across cortical areas.
  • Understanding how these distributed neural populations collectively represent sensory information is a key challenge.
  • Population-coding theories offer frameworks to explain neural representations.

Purpose of the Study:

  • To introduce key concepts in population coding.
  • To review recent studies testing population-coding theories.
  • To focus on sensory representation in the visual cortex and perceptual decisions.

Main Methods:

  • Review of theoretical frameworks for population coding.
  • Discussion of multi-neuronal recording techniques.
  • Analysis of studies investigating neural representations in the visual cortex.

Main Results:

  • Population coding frameworks include population vectors, linear decoders, and Bayesian inference.
  • Recent advances in multi-neuronal recording facilitate empirical testing of these theories.
  • The visual cortex serves as a primary model system for studying sensory representation.

Conclusions:

  • Testing population-coding theories is an emerging area in systems neuroscience.
  • Advances in neural recording and analysis are bringing a deeper understanding within reach.
  • Population coding is crucial for understanding how the brain processes sensory input and guides perception.