aftereffect

An aftereffect is an effect that follows its cause after an interval. This can be observed in psychology as an afterimage, which is a visual illusion where retinal impressions persist after the stimulus is removed. Afterimages can be positive, matching the original image's color or brightness, or negative, appearing as complementary colors or less bright. A common example is the spot of light seen after a camera flash. Aftereffects are a broader class of phenomena known as aftersensations. In a different context, post-traumatic stress disorder (PTSD) is an emotional condition that can follow a traumatic event, characterized by reexperiencing the trauma, emotional numbness, and avoidance of reminders.123