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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.
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,...

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Related Experiment Video

Updated: Jun 27, 2026

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
09:42

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Published on: May 12, 2019

Stimulus contrast modulates functional connectivity in visual cortex.

Ian Nauhaus1, Laura Busse, Matteo Carandini

  • 1Biomedical Engineering Department, University of California Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095, USA. inauhaus@gmail.com

Nature Neuroscience
|November 26, 2008
PubMed
Summary
This summary is machine-generated.

Lateral connections in the visual cortex are more dominant at low stimulus contrast, influencing neural responses. This suggests a dynamic balance between feedforward and lateral inputs based on visual input strength.

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Last Updated: Jun 27, 2026

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Published on: May 12, 2019

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
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Simultaneous Transcranial Alternating Current Stimulation and Functional Magnetic Resonance Imaging
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Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Neural Dynamics

Background:

  • The visual cortex features extensive lateral connections between neurons.
  • Understanding the role of these connections in processing visual information is crucial.

Purpose of the Study:

  • To investigate the impact of lateral connections on neural responses in the visual cortex.
  • To determine how stimulus contrast modulates the influence of lateral connections.

Main Methods:

  • Recording neural activity, including spikes and local field potentials (LFPs), using multi-electrode arrays.
  • Implanting arrays in the primary visual cortex of monkeys and cats.
  • Analyzing the propagation and amplitude of LFP waves generated by neural spikes.

Main Results:

  • Neural spikes generated outward traveling LFP waves.
  • At low stimulus contrast, LFP waves exhibited large amplitudes and long-distance travel.
  • Increasing stimulus contrast progressively reduced LFP wave magnitude and travel distance.
  • LFP traces were predictable by waves from a ~1.5-mm radius at low contrast.

Conclusions:

  • The influence of feedforward versus lateral inputs in the visual cortex is dynamic and contrast-dependent.
  • Lateral connections play a dominant role at low stimulus contrast, potentially aiding spatial signal integration.