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Parallel Processing

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...

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.

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,...

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.

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...

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...

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Related Experiment Video

Updated: May 25, 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

Preferential encoding of visual categories in parietal cortex compared with prefrontal cortex.

Sruthi K Swaminathan¹, David J Freedman

¹Department of Neurobiology, The University of Chicago, Chicago, Illinois, USA.

Nature Neuroscience

|January 17, 2012

Summary

This summary is machine-generated.

The lateral intraparietal (LIP) area shows stronger, faster, and more reliable visual category signals than the prefrontal cortex (PFC). This suggests LIP plays a key role in visual categorization, challenging top-down feedback theories.

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Last Updated: May 25, 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 16, 2017

Topographical Estimation of Visual Population Receptive Fields by fMRI

Topographical Estimation of Visual Population Receptive Fields by fMRI

Published on: February 3, 2015

Area of Science:

Neuroscience
Cognitive Neuroscience
Computational Neuroscience

Background:

Recognizing behavioral relevance of sensory stimuli is crucial for environmental interpretation.
Categorical representations are found in prefrontal cortex (PFC), linked to executive functions.
Neuronal category signals also observed in parietal areas, typically associated with visual-spatial processing.

Purpose of the Study:

To directly compare neuronal activity in the lateral intraparietal (LIP) area and PFC during a visual motion categorization task.
To investigate the role of LIP and PFC in visual categorization.
To test the hypothesis that parietal category signals result from top-down feedback from PFC.

Main Methods:

Monkeys performed a visual motion categorization task.
Neuronal activity was recorded in LIP and PFC.
Category signals were analyzed for strength, reliability, and latency.

Main Results:

LIP exhibited stronger and more reliable category signals compared to PFC.
LIP demonstrated shorter latency for category signals than PFC.
These findings indicate significant involvement of LIP in visual categorization.

Conclusions:

The lateral intraparietal (LIP) area is strongly involved in visual categorization.
Parietal category signals do not appear to arise from PFC feedback during this task.
The study challenges existing models of top-down processing in visual categorization.