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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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Visual System01:26

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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.
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Association Areas of the Cortex01:21

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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:
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Motor and Sensory Areas of the Cortex01:14

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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.
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Anatomy of the Eyeball01:20

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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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Parallel Processing01:20

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Related Experiment Video

Updated: Mar 6, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

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Preparatory attention in visual cortex.

Elisa Battistoni1, Timo Stein1,2, Marius V Peelen1

  • 1Center for Mind/Brain Sciences, University of Trento, Rovereto, Italy.

Annals of the New York Academy of Sciences
|March 3, 2017
PubMed
Summary
This summary is machine-generated.

Preparatory attention, before stimulus onset, involves preactivating specific neurons in the visual cortex. This neural preactivation, whether spatial or content-based, enhances subsequent attentional selection and performance.

Keywords:
biased competitionneuroimagingsearch templatetop-down attentionvisual search

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Visual Attention Research

Background:

  • Top-down attention enables selective processing of relevant stimuli, ignoring distractors.
  • Research has extensively studied attention's effects on neural activity during stimulus presentation.
  • Attention also involves a preparatory phase, where attended features are internally represented before stimulus onset.

Purpose of the Study:

  • To review studies on the neural basis of preparatory attention.
  • To investigate preparatory attention directed spatially and based on content (features to categories).
  • To examine the causal role of preparatory activity in attentional selection and behavior.

Main Methods:

  • Review of neurophysiological studies.
  • Analysis of functional magnetic resonance imaging (fMRI) data.
  • Examination of magnetoencephalography (MEG), electroencephalography (EEG), and transcranial magnetic stimulation (TMS) research.

Main Results:

  • Both spatial and content-based attention increase baseline activity in relevant neural populations.
  • TMS studies demonstrate a causal link between preparatory activity and attentional selection/performance.
  • Preparatory attention involves preactivation of selective neurons in the visual cortex prior to stimulus onset.

Conclusions:

  • Preparatory attention is a general mechanism for preactivating selective neurons, operating across multiple representational levels.
  • This mechanism is functionally relevant, though its limitations and relation to working memory, imagery, and expectation warrant further study.
  • Future research should address open questions regarding the precise mechanisms and broader implications of preparatory attention.