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Psychology Terms – afterimage
A sensory experience, particularly a visual image, that continues after the stimulus has terminated, also referred to as a primary afterimage, or one that emerges subsequent to a primary afterimage. The initial visual afterimage resulting from brief exposure to a bright stimulus is termed a *Hering image and is typically a *positive afterimage, wherein the dark regions of the original image remain dark and the light regions remain light, generally manifesting in the same colors as the original stimulus, though occasionally appearing colorless, and lasting merely a fraction of a second. The ensuing Purkinje image is a complementary afterimage, with the hues of the original stimulus manifesting in nearly complementary colors in the image. It exhibits greater persistence than the Hering image but typically vanishes when the gaze is redirected; however, it can frequently be momentarily reinstated by blinking. The third afterimage is positive and referred to as a *Hess image. The effects can be illustrated by allowing one's eyes to acclimate to darkness for a minimum of 15 minutes, followed by activating a camera's electronic flash—cautioning against direct gaze with dark-adapted eyes—or by momentarily illuminating a bright light.
A sensory experience, particularly a visual image, that continues after the stimulus has terminated, also referred to as a primary afterimage, or one that emerges subsequent to a primary afterimage. The initial visual afterimage resulting from brief exposure to a bright stimulus is termed a *Hering image and is typically a *positive afterimage, wherein the dark regions of the original image remain dark and the light regions remain light, generally manifesting in the same colors as the original stimulus, though occasionally appearing colorless, and lasting merely a fraction of a second. The ensuing Purkinje image is a complementary afterimage, with the hues of the original stimulus manifesting in nearly complementary colors in the image. It exhibits greater persistence than the Hering image but typically vanishes when the gaze is redirected; however, it can frequently be momentarily reinstated by blinking. The third afterimage is positive and referred to as a *Hess image. The effects can be illustrated by allowing one's eyes to acclimate to darkness for a minimum of 15 minutes, followed by activating a camera's electronic flash—cautioning against direct gaze with dark-adapted eyes—or by momentarily illuminating a bright light.
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