Lewis-Williams also argues that the shininess of quartz represents the entoptic
phenomena of the first stage of altered consciousness (2002: 18-19).
It is an entoptic
phenomenon, meaning that its source lies within the eye or visual system itself.
Investigation of the source of the blue field entoptic
Pearson might have mentioned the problems presented for his thesis by the Australian case, where entoptic
imagery abounds in rock-art, but trance and ASC-related shamanism is rarely observed in the ethnographic record.
Patients looked directly into Microvision's device, which scanned the entoptic
perimetry stimulus onto the patient's retina.
Her preposterously obsessive mark making seemed to signal an intention not merely to document the workings of the subconscious pictorially or textually, a la Surrealist dictates, but to register its entoptic
effusions in real time--a subtle shift toward a conception of drawing "as a verb.
eidetic imagery, entoptic
phenomena, hallucination, synesthesia), psi experiences (e.
Additionally, some authorities have included the presence of more basic hallucinations, such as spots, flashes of light and patterns, which are not attributable to entoptic
The healthy individual may sometimes notice physiological entoptic
phenomena, particularly peripheral flashes when viewing in very low illumination.
motifs may have been correctly identified in the Boyne Valley megalithic art and in some other contexts, but they need to go further if they are to show that they were a typical and widespread phenomenon within the west European Neolithic as a whole.
The two entoptic
phenomena strongly associated with the macular pigment are Haidinger's brushes and Maxwell's spot, both of which are only seen under highly specific experimental conditions.
They can be particularly troublesome to elderly people, especially where the pupils are small, because the entoptic
image, which may be moving, is superimposed on the real image.