![]() Illusions can be caused by diverse factors like stimulus factors, cultural factors and psychological factors. One can experience illusions because of many reasons lighting effect on an object, lack of availability of sensory information related to an object or could also be possible because of errors in the processing of sensory details by an individual.Ĭertain conditions called pseudo-hallucinations can be a sign of a psychiatric condition, which individuals experience under situations of anxiety or fear. Illusions can be experienced by anybody and these are not necessarily a symptom of some psychiatric issue like hallucinations, as hallucinations can take place in the absence of external stimuli. Smell and Taste Illusions: Certain people may perceive smells differently from what others perceive and the same may be applied to taste as well.Ĭognitive illusions are good examples for proving how our expectations can influence our perceptions.Its example is Phantom Limb syndrome or the feeling which one undergoes or experiences in case of an amputated limb. ![]() ![]() ![]() Tactile Illusions: Its the sensation of touch stimuli which is perceived by the brain, though it is actually not present or at least not in the way in which the brain perceives it to be present.Shepard tone can be considered as one best example for explaining the phenomenon of auditory illusion which seems to continuously rise or fall in pitch but in reality nothing occurs. Auditory Illusion: When an individual hear those sounds which do not exist in reality or are not created or is being able to hear different sounds which is the distorted version of the actual sound, this phenomenon can be regarded as auditory illusion.Illusions are normal phenomenon, whereas hallucinations and delusions are the pathological states of the mind. In this case, visual illusion can be distinguished from hallucinations or delusion. By spending sometime gazing at the night sky, one will be able to understand the phenomenon of optical illusion, in which the moon in the horizon looks far bigger than when it is high up in the sky. This can be very well explained with the help of Moon Illusion example. Optical illusions can make use of various colours, patterns or light for creating images, which can be misleading or deceptive for the brain.Īlso known as Visual Illusions, optical illusions involve visual deception. Optical Illusion: An image may be constructed in such a way that misleading information is relayed to the brain.Given below is a description on the different types of illusions: Illusions can take place with any of our senses. For an example, in darkness we may perceive a rope to be a snake. The interpretations may not necessarily be always correct and this misinterpretation of information which is perceived by our sensory receptors is called as illusion. The image falls directly onto to the retina which is later processed and interpreted by the brain. In fact there may be errors in perception. Whatever we perceive from the environmental factors around us need not always be true. Even scientific investigations by way of empirical researches may have limitations because the information perceived by way of direct observation can also be quite misleading. Illusions provide us important clues on the information processing capabilities of our brain. It can equally be explained as a sensory distortion in scientific parlance. Perceptual illusion occurs when a stimulus is perceived inaccurately.
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