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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

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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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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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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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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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Related Experiment Video

Updated: Apr 26, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision
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Using Looming Visual Stimuli to Evaluate Mouse Vision

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Two distinct neural mechanisms in early visual cortex determine subsequent visual processing.

Christianne Jacobs1, Tom A de Graaf2, Alexander T Sack2

  • 1Department of Psychology, FST, University of Westminster, London, UK; Department of Cognitive Neuroscience, FPN, Maastricht University, Maastricht, The Netherlands; Maastricht Brain Imaging Center (M-BIC), Maastricht, The Netherlands.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|August 13, 2014
PubMed
Summary
This summary is machine-generated.

Investigating pre-stimulus brain states, this study used transcranial magnetic stimulation (TMS) to disrupt early visual cortex (EVC) activity. TMS at specific timings before visual stimuli impaired awareness, revealing distinct neural mechanisms influencing visual processing.

Keywords:
Early visual cortexState-dependenceSuppressionTranscranial magnetic stimulationVisual perception

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Traditional neuroscience emphasizes sensory processing post-input reception.
  • Emerging research highlights the role of pre-stimulus brain states in biasing sensory interpretation.
  • Understanding these preparatory neural mechanisms is crucial for visual processing.

Purpose of the Study:

  • To investigate pre-stimulus brain mechanisms influencing visual processing.
  • To determine the impact of disrupting early visual cortex (EVC) activity before visual stimulus onset.
  • To differentiate neural mechanisms underlying objective and subjective visual awareness.

Main Methods:

  • Utilized non-invasive focal brain stimulation via transcranial magnetic stimulation (TMS).
  • Disrupted spontaneous brain activity in the EVC at specific pre-stimulus-onset-asynchronies (pSOAs).
  • Employed simple orientation and complex symbolic arrow stimuli, with control measurements and eye-blink tracking.

Main Results:

  • TMS applied to EVC at 20ms or 50ms before stimulus onset suppressed visual awareness.
  • Visual suppression was retinotopically specific at a 20ms pSOA but not at a 50ms pSOA.
  • Suppression for complex stimuli occurred at a 60ms pSOA and was not retinotopically specific, but confirmed as neural.

Conclusions:

  • Identified two distinct neural mechanisms within the EVC that modulate visual input processing.
  • Demonstrated that pre-stimulus EVC activity critically determines whether visual information reaches awareness.
  • Provided evidence for timing-dependent and topographic specificity in pre-stimulus visual processing modulation.