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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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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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Visual Agnosia01:12

Visual Agnosia

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
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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 22, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

Published on: August 22, 2025

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Tracing path-guided apparent motion in human primary visual cortex V1.

Michel Akselrod1, Michael H Herzog2, Haluk Öğmen3

  • 11] Laboratory of Perceptual and Cognitive Dynamics, Center for Neuro-Engineering and Cognitive Science, Department of Electrical &Computer Engineering, University of Houston, USA [2] Laboratory of Psychophysics, Brain Mind Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland.

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The brain

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Vision constructs motion perception, often along the shortest path.
  • Retinotopic activity in V1 correlates with apparent motion filling-in.
  • It remains unclear if V1 activity flexibly reflects subjective illusory motion paths.

Purpose of the Study:

  • To investigate if V1 retinotopic activity reflects illusory motion along curved paths.
  • To compare V1 activity for shortest linear paths versus curved paths in apparent motion.

Main Methods:

  • Utilized a path-guided apparent motion paradigm with a curved cue.
  • Measured retinotopic activity in V1 using fMRI or similar techniques.
  • Analyzed V1 activity patterns corresponding to perceived illusory motion.

Main Results:

  • V1 retinotopic activity successfully reflected illusory filling-in along the curved path.
  • Activity for curved paths was more stimulus-selective than for linear paths.
  • This suggests V1 activity prioritizes the shortest path solution for ambiguous stimuli.

Conclusions:

  • V1 activity flexibly represents subjective illusory motion, including curved paths.
  • The brain may weigh shortest path solutions more heavily when processing ambiguous visual stimuli.
  • Findings shed light on the constructive nature of visual motion perception.