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Related Concept Videos

Association Areas of the Cortex01:21

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,...
Functional Brain Systems: Reticular Formation01:13

Functional Brain Systems: Reticular Formation

The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
Within the reticular formation, there are several distinct nuclei that can be classified into three broad categories. The Raphe nuclei are located along the midline of the brainstem. They are primarily known for their role in synthesizing and releasing serotonin, a neurotransmitter involved in regulating mood, appetite, sleep, and circadian rhythms. The...
Motor and Sensory Areas of the Cortex01:14

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.
Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Functional Brain Systems: Limbic System01:15

Functional Brain Systems: Limbic System

The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
Auditory Pathway01:15

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

Updated: May 25, 2026

Using Informational Connectivity to Measure the Synchronous Emergence of fMRI Multi-voxel Information Across Time
07:12

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Published on: July 1, 2014

Functional connectivity during surround suppression in macaque area V4.

Theodoros P Zanos1, Patrick J Mineault, Jachin A Monteon

  • 1Department of Neurology and Neurosurgery, Montreal Neurological Institue, McGill University, Montreal, QC H3A 2B4, Canada. theodoros.zanos@mcgill.ca

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|January 19, 2012
PubMed
Summary
This summary is machine-generated.

Surround suppression in the visual cortex is dynamically modulated by recurrent neural connections. Stimuli causing suppression strengthen inhibitory connections between V4 neurons, revealing the circuit basis for this visual processing phenomenon.

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Published on: March 21, 2019

Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Processing

Background:

  • Surround suppression is a common neural response where stimuli outside a neuron's receptive field reduce its firing rate.
  • The precise neural circuitry underlying surround suppression, particularly the role of lateral connections, remains largely unidentified.
  • Previous studies often relied on single-neuron recordings, limiting direct observation of inter-neuronal communication.

Purpose of the Study:

  • To identify the underlying circuitry and dynamics of surround suppression in the visual cortex.
  • To investigate the role of lateral and recurrent connections in modulating neuronal responses within area V4.
  • To develop and apply a novel method for estimating neuronal connections and their interactions.

Main Methods:

  • Simultaneous multi-neuron recordings using 100-electrode Utah arrays in macaque monkey area V4.
  • Application of a nonlinear Volterra modeling approach to estimate connection strengths and reliability.
  • Analysis of excitatory and inhibitory connections, including nonlinear interactions between neurons.

Main Results:

  • Confirmed known anatomical patterns: excitatory connections are more prevalent (~65%), proximity and similar receptive field properties correlate with stronger connections.
  • Demonstrated stimulus-dependent reorganization of connectivity: stimuli inducing suppression also increased inhibition among V4 neurons.
  • Identified recurrent connectivity as a key source of surround suppression.

Conclusions:

  • Neuronal connectivity within V4 is dynamic and can reconfigure on short timescales.
  • Recurrent connections play a critical role in mediating surround suppression in the visual cortex.
  • The findings provide insights into the dynamic neural organization contributing to visual processing and surround suppression.