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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.

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...

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,...

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...

Lobes of the Cerebrum

Lobes of the Cerebrum

The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements.

Somatosensation

Somatosensation

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

Updated: Jun 15, 2026

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation

Published on: February 23, 2020

Premotor cortex mediates perceptual performance.

Daniel Callan¹, Akiko Callan, Mario Gamez

¹ATR Computational Neuroscience Laboratories, Kyoto, Japan. dcallan@atr.jp

|February 27, 2010

Summary

This summary is machine-generated.

This study shows that brain activity in speech production areas aids accurate speech perception, especially in noisy conditions. This supports theories where our own actions help us understand speech.

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Area of Science:

Neuroscience
Cognitive Science
Speech Perception Research

Background:

Articulatory goals are theorized to influence speech perception, contrasting direct realist and constructivist (analysis-by-synthesis) models.
While mirror neuron system activity is observed during action observation, its direct link to perceptual performance remains unclear.

Purpose of the Study:

To investigate the relationship between brain activity in action production regions and perceptual performance in an auditory phonetic identification task.
To differentiate between direct realist and constructivist theories of speech perception using neuroimaging data.

Main Methods:

Utilized functional magnetic resonance imaging (fMRI) and magnetoencephalography (MEG) to measure brain activity during a speech perception task in noise.
Employed hierarchical variational Bayesian source analysis for time-frequency analysis of single-trial MEG data.

Main Results:

fMRI showed increased activity in the premotor cortex/Broca's area (PMC/Broca's) for correct versus incorrect speech identification trials.
MEG revealed significantly greater event-related synchronization/desynchronization in alpha, beta, and gamma bands in PMC/Broca's for correct trials, both before and after stimulus onset.
Activity predicted performance and reflected task difficulty, not just stimulus information.

Conclusions:

Articulatory processes, reflected by activity in PMC/Broca's, facilitate accurate speech perception, supporting constructivist theories.
Findings suggest that mirror system activity in this region is involved in perception, not merely covert speech production.
Neural activity preceding stimulus onset indicates predictive processing in speech perception.