This phenomenon can occur months after the last intake of drug. After repeated ingestion of drugs, some people may experience a phenomenon called “flashbacks,” which are spontaneous recurrences of illusions and visual hallucinations during the drug-free state, similar to that experienced during the active stage of drug administration. Reflex hallucinations are experienced under the influence of psychedelic drugs, wherein the patient perceives colorful visual hallucination in response to loud noises. Tactile hallucinations in the form of insects crawling up the skin are experienced during cocaine and amphetamine intoxication. Auditory hallucinations that are unformed and indistinct noises are heard in substance-induced psychoses. Later on, the person experiences vivid and colorful images. The images are usually abstract, such as lines, circles and stars. These are usually preceded by unformed visual sensations – alterations of color, size, shape and movement. Psychoactive substances predominantly induce visual hallucinations. Hallucinations induced by psychoactive substances Lights, visions and voices may be seen or heard during profound religious or mystical experiences, especially conversion – the experiences of Joan of Arc and St Paul are familiar examples. Up to one in six people in Britain and the United States have seen, heard or otherwise experienced ghosts or spirits. Recently, bereaved widows and widowers may “hear” or, more commonly, “see” their dead spouse. A few people describe hearing a comforting or advising voice at some time in their lives. Hearing one's name called aloud or hearing a person's voice but finding no one there is common. Although hallucinations have been a hallmark of mental illness for centuries, they are not always pathological. This paper attained cult status as a paradigmatic case throughout the psychological literature of the nineteenth century following its translation into English in 1803. This apparition haunted him for the duration of the day and, in the subsequent weeks, the number of these figures began to increase. In 1799, a Prussian bookseller of skeptical disposition named Christoph Friedrich Nicolai read a paper to the Royal Society of Berlin entitled “A Memoir on the Appearance of Spectres or Phantoms occasioned by Disease.” In this, Nicolai described how one morning in February 1791, during a period of considerable stress and melancholy in his personal life, he saw the apparition of a deceased person in the presence of his wife, who, however, reported seeing nothing.
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