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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.
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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...

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Related Experiment Video

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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
09:42

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Published on: May 12, 2019

Decoding the motion aftereffect in human visual cortex.

Hinze Hogendoorn1, Frans A J Verstraten

  • 1Helmholtz Institute, Neuroscience & Cognition Utrecht, Experimental Psychology Division, Utrecht University, Utrecht, The Netherlands. j.h.a.hogendoorn@uu.nl

Neuroimage
|June 20, 2013
PubMed
Summary
This summary is machine-generated.

The motion aftereffect (MAE) causes illusory motion perception. This study reveals that illusory motion in MAE is not encoded like real motion, but rather shifts neural responses in area MT+ to resemble orthogonal motion.

Keywords:
Motion aftereffectMultivariate pattern classificationVisual motion processingfMRI

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • The motion aftereffect (MAE) is a visual illusion where adapting to motion leads to perceiving illusory motion in the opposite direction.
  • Understanding the neural mechanisms underlying MAE is crucial for comprehending motion perception.
  • Previous research implicated several brain areas in MAE, but direct comparison of neural activity for real and illusory motion was lacking.

Purpose of the Study:

  • To directly compare the neural activity patterns associated with real motion and illusory motion in the motion aftereffect.
  • To investigate how the brain encodes perceived illusory motion compared to actual visual motion.
  • To identify specific brain regions responsible for the MAE-specific modulation of neural responses.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
  • Multivariate pattern classification techniques were used to analyze neural data.
  • Participants observed real and illusory motion stimuli to compare neural responses.

Main Results:

  • Illusory motion in MAE is not encoded identically to real motion in the same direction.
  • Adaptation in MAE causes a shift in the population response of motion-sensitive neurons in area MT+.
  • This shift in area MT+ resulted in activation patterns more similar to real motion in orthogonal directions, not opposite.
  • Motion selectivity was observed in V1, V2, V3, and V4, but MAE-specific modulation was unique to area MT+.

Conclusions:

  • The findings suggest that MAE involves a re-encoding of motion information in area MT+ rather than a simple reversal.
  • This study provides direct evidence for a distinct neural mechanism underlying illusory motion perception in MAE.
  • The results have significant implications for models of motion perception and the neural basis of visual illusions.