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Related Concept Videos

Vision

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.

Diencephalon: Thalamus and Information Relay

Diencephalon: 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.

Motor and Sensory Areas of the Cortex

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.

Visual System

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 Cortex

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 Cortex

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...

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Related Experiment Video

Updated: Jun 3, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

Neuronal code of spatial visual information in the caudate nucleus.

P Gombköto¹, A Rokszin, A Berényi

¹Department of Physiology, Faculty of Medicine, University of Szeged, Szeged, Hungary.

|March 8, 2011

Summary

Neurons in the caudate nucleus (CN) can process visual spatial information across large fields. This suggests a new model for how the brain codes visual location using distributed neuron groups.

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Last Updated: Jun 3, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

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Published on: August 1, 2018

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Published on: November 21, 2023

Area of Science:

Neuroscience
Visual Processing
Computational Neuroscience

Background:

Previous research indicated large, overlapping receptive fields without retinotopic organization in the caudate nucleus.
The exact mechanism for spatial visual information coding in this brain region remained unclear.

Purpose of the Study:

To investigate an alternative mechanism for spatial visual information coding in the caudate nucleus.
To determine if individual neurons can convey information about stimulus location.

Main Methods:

Extracellular microelectrode recordings were performed in anesthetized cats.
Visual fields were divided into 20 equal parts, and each part was stimulated individually.
Neuronal responses to stimuli at different locations were analyzed.

Main Results:

Each recorded caudate nucleus neuron responded to stimuli across its entire visual field.
85% of neurons showed significantly different responses to stimuli in various receptive field regions.
Neurons demonstrated the capacity to encode stimulus location via their discharge rate.

Conclusions:

Caudate nucleus neurons with large receptive fields and spatial selectivity function as panoramic localizers.
A distributed population code, where groups of neurons with varying maximal responsiveness locations work together, can accurately represent visual stimuli locations.
This distributed coding mechanism offers an alternative to traditional information processing models in the brain.