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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.

Auditory Pathway

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...

The Cochlea

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

Hearing

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.

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,...

Perceiving Loudness, Pitch, and Location

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

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Related Experiment Video

Updated: Jun 25, 2026

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

Published on: February 19, 2014

Functional subdivisions in low-frequency primary auditory cortex (AI).

M N Wallace¹, A R Palmer

¹MRC Institute of Hearing Research, University Park, Nottingham, NG7 2RD, UK. markw@ihr.mrc.ac.uk

Experimental Brain Research

|February 12, 2009

Summary

This summary is machine-generated.

Researchers found distinct modules in the auditory cortex (AI) of guinea pigs, responding to specific sounds and spatial locations. This suggests the AI is organized into separate processing pathways for identifying sounds and their locations.

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Area of Science:

Neuroscience
Auditory System Research
Sensory Processing

Background:

The auditory cortex (AI) processes complex auditory information.
Understanding the functional organization of the AI is crucial for deciphering auditory perception.

Purpose of the Study:

To investigate the presence of functional modules within the low-frequency region of the AI.
To determine if these modules are defined by responses to communication calls or spatial localization cues.

Main Methods:

Electrophysiological recordings were performed on units in the anaesthetized guinea pig AI.
Stimuli included conspecific vocalizations (chutter and purr calls) and virtual motion (binaural beats).
Recording tracks were oriented orthogonally to the cortical surface.

Main Results:

A significant proportion of recorded units showed time-locking to specific vocalizations (chutter and purr calls).
Several units exhibited preferences for stimuli from particular spatial regions (contralateral, ipsilateral, midline).
Some units displayed asymmetric responses to binaural beats, indicating directional sensitivity.

Conclusions:

Approximately half of the low-frequency AI appears to be organized into distinct functional modules.
These findings support a model of the AI containing separate "what" (identification) and "where" (localization) processing pathways.