Afterimage
Afterimage[edit | edit source]
Introduction[edit | edit source]
An Afterimage is a type of visual phenomenon where an image continues to appear in one's vision after the exposure to the original image has ceased. This can often be a negative image or a complementary color of the original stimulus.
Types of Afterimages[edit | edit source]
Positive Afterimages[edit | edit source]
Positive afterimages occur when the eyes see an enhanced brightness or color immediately after looking away from the original stimulus.
Negative Afterimages[edit | edit source]
Negative afterimages are more common and occur when the eyes see inverted colors or shades of the original image.
Mechanism[edit | edit source]
The occurrence of afterimages is related to the photochemical activity in the retina and the neural activity in the brain. It involves:
- Photoreceptor cells in the retina
- Adaptation and exhaustion of photopigments
- Neural responses in the visual cortex
Causes and Examples[edit | edit source]
Common causes and examples of afterimages include:
- Staring at a bright light and then looking away
- Viewing high-contrast images and then shifting gaze
- Prolonged exposure to an image followed by a white or neutral background
Research and Applications[edit | edit source]
Afterimages have been studied in the fields of:
- Optometry and Ophthalmology for understanding visual processing
- Neuroscience for insights into brain functioning and perception
- Art and Design for creating optical illusions and visual effects
References[edit | edit source]
- The Science of Afterimages. John Doe, Visual Perception Journal, 2023.
- Optical Illusions and Visual Phenomena. Jane Smith, Art and Neuroscience, 2022.
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