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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.
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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...
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,...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...

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Related Experiment Video

Updated: Jul 7, 2026

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
13:00

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

Attention-modulated activity in visual cortex--more than a simple 'spotlight'.

Notger G Müller1, Daniel Ebeling1

  • 1Cognitive Neurology Unit and Brain Imaging Center, Clinic for Neurology, Johann Wolfgang Goethe-University, Schleusenweg 2-16, 60528 Frankfurt am Main, Germany.

Neuroimage
|January 29, 2008
PubMed
Summary
This summary is machine-generated.

Visual attention modulates brain activity in the retinotopic visual cortex. Peripheral visual field representations are suppressed by central attention, with further suppression for distracting stimuli.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Attention plays a crucial role in visual processing.
  • The visual cortex is organized retinotopically, meaning adjacent areas process adjacent parts of the visual field.
  • Previous research suggests an attentional spotlight mechanism.

Purpose of the Study:

  • To investigate how attention modulates activity in retinotopic visual cortex representations of the peripheral visual field.
  • To determine if the nature of sensory input at unattended locations influences this modulation.
  • To examine the relationship between task demands and attentional modulation.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) to measure brain activity.
  • A central attention task involving a letter stream.
  • Peripheral visual stimuli presented at varying locations.
  • Behavioral probes to assess response times.

Main Results:

  • Central attention attenuated activity in peripheral visual cortex representations.
  • This attenuation was independent of passive viewing versus active attending when peripheral locations were empty.
  • Distracting peripheral letters led to additional attenuation during active attention.
  • Target-incompatible peripheral letters were suppressed, while compatible letters were enhanced.
  • Behavioral data showed prolonged responses to probes at suppressed locations.

Conclusions:

  • Activity modulation in visual cortex reflects more than just an attentional spotlight.
  • Sensory input at unattended locations shapes attentional modulation.
  • The relationship between sensory input and task demands further refines visual processing.