utóképei

utóképei is a Hungarian term that translates to "afterimages" or "residual images." It refers to a visual phenomenon where a person continues to see an image after the original stimulus has been removed. This persistence of vision is a common experience and can be triggered by bright lights, staring at patterned objects, or even sudden darkness.

The phenomenon is related to the way our eyes and brain process visual information. When light stimulates the photoreceptor cells in the retina (rods and cones), these cells send signals to the brain. After the stimulus is gone, the cells may continue to send signals for a brief period, creating the illusion of an afterimage. The color and intensity of the afterimage depend on the original stimulus. For example, staring at a bright red object and then looking at a white surface often results in a green afterimage. This is due to a process called retinal fatigue, where the light-sensitive cells become temporarily desensitized.

utóképei can be positive, meaning the afterimage is the same color as the original stimulus, or negative, where the colors are inverted (complementary colors). Positive afterimages are typically brief and occur when the stimulus is not too intense. Negative afterimages are more common and are caused by the adaptation of the visual system. While usually harmless, persistent or unusually vivid afterimages can sometimes be indicative of underlying eye conditions and may warrant medical attention. The study of afterimages has contributed to our understanding of visual perception and how the human eye and brain work together.