Säilytysnäky

Säilytysnäky refers to a visual phenomenon or memory that persists after the stimulus that caused it has been removed. This is a form of sensory memory, specifically a type of visual memory. It is closely related to the concept of afterimages, but säilytysnäky can be more prolonged and sometimes less distinct.

The experience of säilytysnäky can vary greatly among individuals. Some people might perceive a faint, ghost-like image of a previously seen object or scene, while others may experience a more vivid and detailed representation. This phenomenon is not considered a disorder and is a normal aspect of human visual processing. It is thought to be a temporary storage of visual information in the brain's sensory buffer.

Factors such as the intensity and duration of the original visual stimulus, as well as individual differences in visual processing speed and attention, can influence the strength and persistence of säilytysnäky. It plays a role in our ability to perceive continuous motion and integrate visual information over short periods. While often fleeting, under certain conditions, particularly with prolonged exposure to bright lights or specific patterns, the effects of säilytysnäky can be more noticeable.