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An Illusion is a perceptual error or interpretation of a real external stimulus. In the field of anomalous phenomena it is very difficult to distinguish sometimes when a witness refers to a lived illusion or a real fact. So that we have a little knowledge of what it is and its different variants, to take them into account both for witnesses and for researchers, the latter are not exempt from living them, we have done a small breakdown of their different types. The subject itself is much more extensive and we invite the reader to seek information if he believes that his curiosity with this text is not satisfied.

Fancy and creativity: encompass for example the pareidolias, the most common are the forms in the clouds, a shadow with a human form, a face through a glass caused by an object, etc.

Catatonic illusions: anger, fear, etc, would form part of the great emotional component that causes them, an example would be the fear of seeing a deceased family member on a night where you feel fear or terror.

Expectation: It is given in situations in which we have focused our attention to an event, for example when you have a conversation by whatsapp with the mobile in your pocket and you think it vibrates, when you remove it there is no notification, it has not even vibrated or dreamed of.

Suggestion: in this case this is one of the most important along with the previous one in the subjects that occupy us, in a pair of practical examples would be the attribution to natural noises, momentary air currents or even the own touch with the clothes or the Which would give a false sense of having been touched, heard something strange or have seen something in motion, more usual is the case of texts with psychophonies, the brain will try to give the interpretation to the heard element of what really is reading. That is why it is necessary not to give interpretations to the listeners of them, so each brain will “understand” something different. (Consensus validation technique).

Lack of information: when we do not have the stimulus in its entirety because it is absorbed by another element, we believe to hear a voice in the distance mixed with barking dogs or the noise of a nearby road.

We must take into account that an illusion is something lived, for the subject is real, it is a clear experience, but it is not objective because it is due to an error, it is where you have to be careful when evaluating a testimony obtained, Or a given testimony.

We hope that the text serves as a brief reference and help.

Raúl Barranco García.