Some new entoptic phenomena
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Cited by (57)
A mathematical model of embodied consciousness
2017, Journal of Theoretical BiologyCitation Excerpt :Various spiritual practices (e.g., meditation), the use of hallucinogenic drugs (e.g., mescaline), extreme life experiences (e.g., near death experiences), dreams, phenomena of entoptic vision induced by ocular pressure, and clinical conditions have been associated with reported subjective experiences of strange and fascinating spatial patterns in consciousness: radial patterns, spirals, funnels, cobwebs, honeycomb lattices and triangles, deep tunnels, which have then been a topic of artistic representation in many cultures (e.g., mandalas) (Klüver, 1926, 1966; Tyler, 1978; Fregnac, 2003; Siegel, 2005). Such patterns have been hypothesized to reflect the inner structure of spatial consciousness as a level of representation and a mode of access to information (Tyler, 1978, as cited in Fregnac, 2003). We can wonder whether our model can predict similar patterns, as would be expected from a valid model of consciousness, given their importance in human experience.
The visual snow phenomenon
2014, Journal Francais d'OphtalmologieSpatiotemporally varying visual hallucinations: II. Spectral classification and comparison with theory
2014, Journal of Theoretical BiologyCitation Excerpt :Although the retinal cause of the hallucination seemingly implies that the patterns of neural activity corresponding to hallucinations occur at the retina, but degenerative retinal disease is hypothesized to induce neuronal hyperexcitability in the visual cortex as neurons starved of input adaptively increase their gains until activity reaches high levels (Madill and Ffytche, 2005; Tan and Sabel, 2006; Ffytche, 2008). The patterns seen after self-induced retinal deformation are binocular so they must occur at a point where binocular processing takes place (Tyler, 1978), the first (but not only) such area being the primary visual cortex. Acute zonal occult outer retinopathy (AZOOR) is a rare condition that involves localized loss of vision accompanied by photopsia (Carrasco et al., 2005; Gass et al., 2002; Holz and Spaide, 2005).
The shapes of things that were: applying Huarpa art (AD 250-700) to the Lewis-Williams and Dowson entoptic model for shamanism
2023, Boletin del Museo Chileno de Arte PrecolombinoModelling phenomenological differences in aetiologically distinct visual hallucinations using deep neural networks
2023, Frontiers in Human NeuroscienceA Dictionary of Hallucinations
2023, A Dictionary of Hallucinations
Supported by the Smith-Kettlewell Eye Research Foundation and NIH grants EY 01186.