An hallucination can be experienced through any of the senses singly, or all of them, together. So one might have an hallucinatory smell or sound. To understand hallucinations, which are quite common without any use of drugs such as alcohol, LSD, or cannabis, one must remember that everyone has the natural ability to produce such images. One of the definitions of a dream according to Freud is its hallucinatory quality. While asleep we can create full sensory, vocal, motor and emotional experience in our dream. While dreaming we usually accept what we experience as real. An hallucination is an experience of a ‘dream’ occurring while we have our eyes open. The voices heard, people seen, smells smelt, although appearing to be outside of us, are no more exterior than the things and images of our dreams. With this information one can understand that much classed as psychic phenomena and religious experience is an encounter with the dream process. That does not, of course, deny its importance.
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