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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...

Sensory Perception: Organization of the Somatosensory System

Sensory Perception: Organization of the Somatosensory System

The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...

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,...

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...

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Related Experiment Video

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Using the Race Model Inequality to Quantify Behavioral Multisensory Integration Effects

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Multisensory integration in the superior colliculus: a neural network model.

Mauro Ursino¹, Cristiano Cuppini, Elisa Magosso

¹Department of Electronics, Computer Science and Systems, University of Bologna, Bologna, Italy. mauro.ursino@unibo.it

Journal of Computational Neuroscience

|May 15, 2008

Summary

This study models how neurons in the superior colliculus (SC) integrate visual and auditory stimuli. The mathematical model reveals that neural non-linearities and synaptic connections explain key multisensory integration properties.

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Published on: February 7, 2020

Area of Science:

Neuroscience
Computational Neuroscience

Background:

Neurons in the superior colliculus (SC) integrate multisensory stimuli.
Understanding the mechanisms of multisensory integration in the SC is crucial.

Purpose of the Study:

To propose a mathematical model for the integrative response of SC neurons.
To elucidate potential physiological mechanisms of multisensory integration in the SC.

Main Methods:

Developed a computational model with three neural areas: unimodal auditory, unimodal visual, and a multisensory SC area.
Simulated responses to various combinations of visual and auditory stimuli.

Main Results:

The model replicates inverse effectiveness in multisensory enhancement and contrast.
Demonstrated within- and cross-modality suppression for spatially disparate stimuli.
Observed reduced network settling time for cross-modal stimuli compared to unimodal stimuli.

Conclusions:

Non-linearities in neural responses and synaptic connections can explain observed multisensory integration phenomena.
The model provides a framework for understanding SC neuron function in multisensory processing.