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Related Concept Videos

Vision01:24

Vision

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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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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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....
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Association Areas of the Cortex01:21

Association Areas of the Cortex

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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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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Visual System01:26

Visual System

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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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The Retina01:32

The Retina

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The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
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Attention Determines Contextual Enhancement versus Suppression in Human Primary Visual Cortex.

Anastasia V Flevaris1, Scott O Murray2

  • 1Department of Psychology, University of Washington, Seattle, Washington 98195 ani.flevaris@gmail.com.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 5, 2015
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Summary

Neural responses in the primary visual cortex (V1) can be suppressed or enhanced by surrounding stimuli. This effect depends on attention focus and can be modeled by combining feature-based attention with response normalization.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Neural responses in primary visual cortex (V1) are influenced by stimulus context.
  • Contextual interactions, such as orientation-tuned suppression and enhancement, are observed but their mechanisms are debated.

Purpose of the Study:

  • To investigate how attention focus modulates contextual effects in V1.
  • To explain stimulus-based suppression and enhancement using a computational model.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) in humans.
  • Manipulating stimulus context and attention focus.
  • Developing a computational model combining feature-based attention and response normalization.

Main Results:

  • V1 responses to contextual stimuli can be either suppressed or enhanced.
  • The focus of attention significantly alters these contextual effects.
  • A model integrating feature-based attention and response normalization successfully explains the observed V1 responses.

Conclusions:

  • Contextual interactions in V1 are flexible and strongly influenced by attentional state.
  • Feature-based attention and response normalization are key mechanisms underlying these context-dependent modulations.