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Is it possible for an individual to block out all reality and see objects, colors and hear voices and sounds that are non-existent non-stop?

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Yes, it is. Seeing objects, colors, hearing voices and sounds are electrical impulses translated by our sensorial organs and sent to the brain. There are cases of blind people which can "see" (feel?) a whole load of abstract images, and are actually bothered by it.

A person could have no sensing organs and still have electrical impulses by means of artificial brain stimulus, or due to a neurological damage; tinnitus comes to mind (no pun intended).

When TMS [transcranial magnetic stimulation] is applied with a single pulse to motor or sensory cortex, it is possible to evoke a motor or sensory response. When the sensory cortex is visual cortex, the response is a phosphene.4 Phosphenes are the sensation of light in the absence of visual stimulation.

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  1. We do this with dreams. Lucid dreaming allows us to modify what we experience.

  2. This is the stock in trade of stage hypnotists. They induce a false or partially false reality in which the subject experiences non-real people, objects and sensations. Self-hypnosis is possible.

  3. This happens with hallucinogens, e.g. peyote.

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