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Hallucination is defined as visual perception without external stimulation. It must be distinguished whether the individual is able to recognize that the perception is not real, also called pseudo-hallucination, or that the individual endorses it as real, also called delusion. It is only delusion that has serious psychiatric implications.
A hallucination is a perception in the absence of an external stimulus that has the compelling sense of reality. [6] They are distinguishable from several related phenomena, such as dreaming (), which does not involve wakefulness; pseudohallucination, which does not mimic real perception, and is accurately perceived as unreal; illusion, which involves distorted or misinterpreted real ...
Thus, different recipients can be expected to share similar imaginative experiences, which stands in contrast to more recipient-centered illusionist experiences like hallucinations, dreams, daydreams and delusions. Aesthetic illusion (immersion) is always counterbalanced by a rational awareness of the recipient of the difference between the ...
Expansive delusions may be maintained by auditory hallucinations, which advise the patient that they are significant, or confabulations, when, for example, the patient gives a thorough description of their coronation or marriage to the king. Grandiose and expansive delusions may also be part of fantastic hallucinosis in which all forms of ...
Peduncular hallucinosis (PH) is a rare neurological disorder that causes vivid visual hallucinations that typically occur in dark environments and last for several minutes. . Unlike some other kinds of hallucinations, the hallucinations that patients with PH experience are very realistic, and often involve people and environments that are familiar to the affected individua
Unlike illusions, which involve the misinterpretation of actual external stimuli, visual hallucinations are entirely independent of external visual input. [2] They may include fully formed images, such as human figures or scenes, angelic figures, or unformed phenomena, like flashes of light or geometric patterns. [2] [3]
Other illusions occur due to biological sensory structures within the human body or conditions outside the body within one's physical environment. The term illusion refers to a specific form of sensory distortion. Unlike a hallucination, which is a distortion in the absence of a stimulus, an illusion describes a misinterpretation of a true ...
The book takes influence from the works of Frank Podmore, Joseph Jastrow and Ivor Lloyd Tuckett dealing with the "fallacies underlying psychical research". Rawcliffe critically examines claims of the occult, parapsychology and spiritualism concluding that they are best explained by psychological factors such as hallucination, hysteria, neurosis and suggestion as well as "delusion, fraud ...