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Related Concept Videos

Vision01:24

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.
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...
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.
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,...
Somatosensory, Motor, and Association Cortex01:23

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 System01:26

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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A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
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Circuits for local and global signal integration in primary visual cortex.

Alessandra Angelucci1, Jonathan B Levitt, Emma J S Walton

  • 1Department of Ophthalmology and Visual Science, Moran Eye Center, University of Utah, Salt Lake City, Utah 84132, USA. alessandra.angelucci@hsc.utah.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 28, 2002
PubMed
Summary

Long-distance visual signal integration in the primary visual cortex (V1) involves both horizontal and feedback connections. Feedback circuits from extrastriate cortex are crucial for contextual modulation and global-to-local visual signal integration.

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Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Cortical Connectivity

Background:

  • Primary visual cortex (V1) neurons integrate visual signals beyond their classical receptive field (cRF).
  • Understanding the neural circuits responsible for long-distance integration is crucial for visual processing.
  • Spatial summation and contextual modulation in V1 suggest complex neural interactions.

Purpose of the Study:

  • To identify the cortical circuits mediating long-distance visual signal integration in V1.
  • To compare the spatial scales of V1 horizontal and feedback connections with neuronal receptive fields.
  • To elucidate the role of these connections in contextual modulation and global-to-local processing.

Main Methods:

  • Combination of anatomical and physiological recording techniques.
  • Analysis of intra-areal V1 horizontal connections and inter-areal feedback connections.
  • Comparison of connectional spatial scales with classical receptive field (cRF), spatial summation field (SF), and surround field dimensions in macaque V1 neurons.

Main Results:

  • V1 horizontal connections are spatially scaled for interactions within the SF and mediate contrast-dependent SF size changes.
  • V1 horizontal connections do not fully explain the dimensions of the surround field.
  • Feedback circuits from extrastriate cortex possess spatial scales commensurate with center-surround interactions, suggesting a role in contextual modulation.

Conclusions:

  • Feedback connections from extrastriate cortex are key for contextual modulation and global-to-local integration of visual signals in V1.
  • V1 horizontal connections are isotropic and sufficient for orientation selectivity, while anisotropic feedback connections may aid contour completion.
  • The distinct spatial scales and properties of horizontal and feedback connections highlight their specialized roles in visual processing.