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Vision

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.

Motor and Sensory Areas of the Cortex

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.

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Related Experiment Video

Updated: Jun 15, 2026

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Published on: May 12, 2019

Stimulus predictability reduces responses in primary visual cortex.

Arjen Alink¹, Caspar M Schwiedrzik, Axel Kohler

¹Department of Neurophysiology, Max Planck Institute for Brain Research, Frankfurt am Main, Germany. alink@mpih-frankfurt.mpg.de

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|February 26, 2010

Summary

This summary is machine-generated.

Predictable visual stimuli evoke smaller responses in the primary visual cortex (V1). This suggests the brain anticipates sensory input, reducing neural activation during early visual processing.

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Area of Science:

Neuroscience
Cognitive Psychology
Visual Perception

Background:

The primary visual cortex (V1) is crucial for initial visual processing.
Understanding how the brain processes predictable versus unpredictable stimuli is key to understanding predictive coding.

Purpose of the Study:

To investigate if stimulus predictability influences neural responses in V1.
To explore the role of illusory motion in predicting visual stimuli.

Main Methods:

Functional magnetic resonance imaging (fMRI) was employed.
Participants viewed visual stimuli with predictable and unpredictable onset and motion direction, cued by illusory motion.

Main Results:

Smaller neural responses were observed in V1 when stimulus onset or motion direction was predictable.
Illusory motion dynamics effectively predicted subsequent visual stimuli.

Conclusions:

The human brain actively anticipates future sensory input.
Predictive mechanisms in the brain lead to reduced neural activation in early visual processing stages for predictable stimuli.