Cortical dynamics of the visual change detection process

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Updated: Jun 15, 2026

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Published on: May 12, 2019

Tomokazu Urakawa1, Koji Inui, Koya Yamashiro

  • 1Department of Integrative Physiology, National Institute for Physiological Sciences, Okazaki, Japan. turakawa@nips.ac.jp

Psychophysiology
|March 17, 2010
PubMed

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Difference from Background: Limit of Detection

The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
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Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
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Parallel Processing

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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Motor and Sensory Areas of the Cortex

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