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Related Concept Videos

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.
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...
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.

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Related Experiment Video

Updated: Jul 3, 2026

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
08:42

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex

Published on: February 8, 2020

Task difficulty modulates the activity of specific neuronal populations in primary visual cortex.

Yao Chen1, Susana Martinez-Conde, Stephen L Macknik

  • 1Department of Biological Sciences, State University of New York, 33 West 42nd Street, New York, New York 10036, USA.

Nature Neuroscience
|July 8, 2008
PubMed
Summary

Task difficulty modulates neural activity in the primary visual cortex (V1) during spatial attention. Increasing difficulty enhances neural responses at the focus of attention while suppressing responses in surrounding areas.

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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
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Related Experiment Videos

Last Updated: Jul 3, 2026

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
08:42

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex

Published on: February 8, 2020

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

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Published on: May 12, 2019

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Spatial attention improves stimulus detection in specific visual field regions.
  • The neuronal basis for task difficulty's influence on spatial attention is not well understood.

Purpose of the Study:

  • To investigate how task difficulty affects neuronal activity in the primary visual cortex (V1) during spatial attention.
  • To elucidate the neuronal mechanisms underlying the modulation of spatial attention by task difficulty.

Main Methods:

  • Recorded neuronal firing rates in area V1 of monkeys (Macaca mulatta).
  • Manipulated task difficulty during spatial attention tasks.
  • Analyzed neuronal responses in relation to the focus of attention and surrounding regions.

Main Results:

  • Task difficulty significantly modulated V1 neuronal firing rates.
  • Increased task difficulty enhanced firing at the focus of attention and suppressed it in surrounding areas.
  • Neuronal populations mediating enhancement and suppression differed in properties like direction selectivity and contrast sensitivity.

Conclusions:

  • Task difficulty dynamically modulates neural activity in V1, supporting center-surround models of spatial attention.
  • Specific neuronal populations in V1 are responsible for attention-related enhancement and suppression, influenced by task demands.