There has been a great deal of work trying to find evidence of motifs and compositions derived from entoptic phenomena in prehistoric art, especially rock art and megalithic art.
12.
The justification of this research is that entoptic phenomena normally occur during states of altered consciousness, the practice of which may impact our views of ancient religious and social practice.
13.
In archaeology, the term "'entoptic phenomena "'relates to visual experiences derived from within the eye or brain ( as opposed to externally, as in normal vision ).
14.
During ASCs, which can be induced in a number of ways, the first stage of hallucination experienced by a subject contains only entoptic phenomena, such as the scintillating scotoma experienced by migraine sufferers.
15.
Furthermore, there is a need to have the idea behind the neuropsychological model practically demonstrated in further examples than the rock art of the San, Coso people and Upper Palaeolithic used in " The signs of all times : entoptic phenomena in Upper Palaeolithic art " ( 1988 ).
