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>whereas psychedelics cause stimuli that have no outside origin but are instead constructed by the mind with the help of the drug. So, in this sense these realities are not real, but the experience can be as real as any other.Yeah, but dreams are also internally generated, and so are experiences in other altered states, especially when sensory deprivation is involved. Day dreams, visions induced by meditation or hypnagogia, etc. are also produced internally, only more often than not the internally generated experiences and perceptions are incorporated into waking consciousness. This isn't something unique to psychedelics, even when speaking in terms of drugs. Stimulant psychosis, psychotomimetic effects of drugs in general, the hypnagogic dream-like states morphine and opioids can cause, and the hole-experiences and hallucinations dissociatives can cause are all examples of this same phenomenon.
See, the brain is always producing internally generated noise, perceptions, and experiences. Neural oscillations at the 40hz range produced from incoming sensory information is synchronized with sensory processing networks as a part of the sensory binding process, which integrates external sensory information into our perceptual experience of reality. Once the sensory processing neural pathways in the thalamocortical circuit are synchronized with the neural oscillations generated by thw external sensory input, the internally generated sensory data being generated is gated by the thalamus, essentially "locking in" the external sensory feed to the sensory binding pathways, resulting in our internally generated model of consciousness using the external sensory data to construct our perceptual experience.
Dissociation brought on as a result of altered states of consciousness (be it the result of drugs, the sleep-wake cycle, sensory deprivation, relaxation, meditation, impaired cognitive functioning resulting from physical damage or structural deformations, physiological causes resulting from malnutrition or excessive nutrional supplementation, wandering attention, electrical stimulation, etc., results in either the desynchronization of these neural oscillations form the neural processing and sensory binding networks or the decoupling of the neurons in the sensory organs from their neurons connecting them to said networks like is observed from sensory deprivation like during the Ganzfeld experiment) results in the "bleeding in" of mind's naturally generated internal noise... for example, day dreams, hallucinations, delusional thought patterns, etc.