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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.

Visual System

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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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
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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...

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Multiple Transient Signals in Human Visual Cortex Associated with an Elementary Decision.

Thomas Meindertsma^1,2,3, Niels A Kloosterman^4,2,5, Guido Nolte³

¹Department of Psychology and t.meindertsma@uva.nl.

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

|May 13, 2017

Summary

This summary is machine-generated.

Brain activity in the beta-band (12-30 Hz) changes during visual decisions. This modulation is linked to decision-making itself, not motor actions or arousal, suggesting a top-down signal in the visual cortex.

Keywords:

beta oscillations cortical state perceptual decision-making pupil-linked arousal visual cortex

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Area of Science:

Neuroscience
Cognitive Neuroscience

Background:

The cerebral cortex exhibits dynamic state changes, reflected in power spectrum modulations.
Previous studies noted beta-band activity changes during visual decisions but didn't isolate decision processing from confounding factors.

Purpose of the Study:

To identify the specific factors driving beta-band modulation in the visual cortex during perceptual decisions.
To differentiate decision-related neural signals from motor actions, arousal, and sensory processing.

Main Methods:

Magnetoencephalography (MEG) was used in human participants.
Participants performed elementary visual decisions involving target appearance/disappearance.
Behavioral reports included overt actions (button presses) and silent counting.

Main Results:

Beta-band suppression correlated with target disappearances, while enhancement correlated with reappearances.
This modulation persisted regardless of whether the report was overt or silent, ruling out motor execution.
The beta-band changes were independent of pupil-linked arousal and eye movements.

Conclusions:

Beta-band modulation in the visual cortex is a top-down signal related to converting perceptual information into behavioral decisions.
This signal is not driven by motor output, arousal, or basic sensory processing.
The findings suggest a feedback mechanism from decision-processing regions to the visual cortex.