An optical illusion (also called a visual illusion) is characterized by visually perceived Visual perception is the ability to interpret information and surroundings from visible light reaching the eye. The resulting perception is also known as eyesight, sight or vision. The various physiological components involved in vision are referred to collectively as the visual system, and are the focus of much research in psychology, cognitive images that differ from objective reality. The information gathered by the eye is processed in the brain to give a percept The percept is a perceived form of external stimuli or their absence. Vivid dreams could also be considered as a form of perception without a clear source of external stimuli. The term is primarily used in philosophy and psychology as sense-datum to explain perception that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological ones that are the effects on the eyes and brain of excessive stimulation of a specific type (brightness, tilt, color, movement), and cognitive Cognition is the scientific term for "the process of thought" to knowing. Usage of the term varies in different disciplines; for example in psychology and cognitive science, it usually refers to an information processing view of an individual's psychological functions. Other interpretations of the meaning of cognition link it to the illusions where the eye and brain make unconscious inferences.
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