<P> Not all people have the same internal perceptual ability . For many, when the eyes are closed, the perception of darkness prevails . However, some people are able to perceive colorful, dynamic imagery . The use of hallucinogenic drugs increases the subject's ability to consciously access visual (and auditory, and other sense) percepts . The Mental Imagery article goes into more detail . </P> <P> Furthermore, the pineal gland is a hypothetical candidate for producing a mind's eye; Rick Strassman and others have postulated that during near - death experiences (NDEs) and dreaming, the gland might secrete a hallucinogenic chemical N, N - Dimethyltryptamine (DMT) to produce internal visuals when external sensory data is occluded . However, this hypothesis has yet to be fully supported with neurochemical evidence and plausible mechanism for DMT production . </P> <P> The hypothesized condition where a person lacks a mind's eye is called aphantasia . The term was first suggested in a 2015 study . </P> <P> In Theosophy it is related to the pineal gland . According to this belief, humans had in far ancient times an actual third eye in the back of the head with a physical and spiritual function . Over time, as humans evolved, this eye atrophied and sunk into what today is known as the pineal gland . Dr. Rick Strassman has hypothesized that the pineal gland, which maintains light sensitivity, is responsible for the production and release of DMT (dimethyltryptamine), an entheogen which he believes possibly could be excreted in large quantities at the moments of birth and death . </P>

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