Etymologically the term comes from the Latin illusion . It is a distortion of the understanding of reality, which occurs for different reasons. The illusion can affect from a single sense such as vision (optical illusion) at the same time, even manifesting at the same time in several or all of them.
The illusions can be caused by external stimuli real misinterpreted by our sensory organs, for example, you could have the sensation of hearing a noise (auditory illusion) without actually some sound occur, or in the gloom could be perceived To be visualizing any figure, many times the product of our imagination, and only to be seeing a lot of dirty clothes, for example, illusions of touch, smell and taste can also occur, although these are much less frequent for psychologically healthy individuals.
The illusions are an example of optical illusions, which have the particularity of being experiences sucedidas full light of the day, causing the human eye to detect in the distant ground a kind of liquid like water when really this is not really there. In Spanish this word is used to denote positive desires that harbor the hope of achieving something, being the only language for which this use would apply. In the field of psychology and psychiatry, the illusions that individuals suffering from certain pathologies may have, such as psychosis, thought dissociations, and schizophrenia are studied more deeply as the main ones to be considered, since for people with these conditions and their neighbors, these illusions can be somewhat delicate with respect to their own well-being, both physical and emotional.
There are, for example, illusions of totally realistic characteristics for those who suffer from schizophrenia, having the certainty of having heard conversations that were never said or having visions of things that are not really happening. There are also illusions due to delusions, which can be caused by some other pathology not necessarily psychic, such as people who when their body temperature rises a lotthey experience episodes of very vivid illusions. The use of psychotropic substances also triggers in some cases sensory illusions of all kinds, from seeing things that are not there, as well as seeing them in a distorted way, feeling humidity in a dry environment, etc. On the other hand, in the world of entertainment, many have perfected illusory art, to make their viewers believe that they are capable of recreating moments where physical logic does not come to light, magicians by trade.
