I have to do this about once a month...
Ketamine produces effects similar to PCP and DXM. Like other dissociative anesthetics in low- to upper-middle dosages, its hallucinogenic effects are only seen against a background lacking sensory stimulation, such as darkness.[citation needed] Unlike the other well known dissociatives PCP and DXM, ketamine is very short acting, its hallucinatory effects lasting fifteen minutes when insufflated or injected and, up to an hour when ingested, the total experience lasting no more than a couple of hours. [53] Like the other dissociative anaesthetics DXM and PCP, hallucinations caused by ketamine are fundamentally different from those caused by tryptamines and phenethylamines. At low doses, hallucinations are only seen when one is in a dark room with one's eyes closed, while at medium to high doses the effects are far more intense and obvious. [54] These effects include changes in the perception of distances, relative scale, colour and durations/time, as well as a slowing of the visual system's ability to update what the user is seeing.[citation needed] There are reports of high-dosage users being able to see their surroundings in two sharp images, as if the brain is unable to merge the images each eye is sending. Speech often sounds unintelligible i.e. alogia, and auditory hallucinations may occur.[citation needed] At high doses sounds can be out of sync with the user's visual field. Synesthesia may also occur.[citation needed]
Ketamine produces a dissociative state, characterised by a sense of detachment from one's physical body and the external world which is known as depersonalization and derealization.[55]} At sufficiently high doses (e.g. 150 mg intramuscular), users may experience what is coined the "K-hole", a state of dissociation whose effects are thought to mimic the phenomenology of schizophrenia.[56]. This may include distortions in bodily awareness, such as the feeling that one's body is being tugged, or is gliding on silk, flying, or has grown very large or distended. Users often report feeling more skeletal or becoming more aware of their bones - the shape of their hands is also often of interest.[citation needed] Users may experience worlds or dimensions that are ineffable, all the while being completely unaware of their individual identities or the external world. Users have reported intense hallucinations including visual hallucinations, perceptions of falling, fast and gradual movement and flying, 'seeing God', feeling connected to other users, objects and the cosmos, experiencing psychic connections, and shared hallucinations and thoughts with adjacent users.
Users may feel as though their perceptions are located so deep inside the mind that the real world seems distant (hence the use of a "hole" to describe the experience). Some users may not remember this part of the experience after regaining consciousness, in the same way that a person may forget a dream. Owing to the role of the NMDA receptor in long-term potentiation, this may be due to disturbances in memory formation. The "re-integration" process is slow, and the user gradually becomes aware of surroundings. At first, users may not remember their own names, or even know that they are human, or what that means. Movement is extremely difficult, and a user may not be aware that he or she has a body at all. [57]
Ketamine produces a dissociative state, characterised by a sense of detachment from one's physical body and the external world which is known as depersonalization and derealization.[55]} At sufficiently high doses (e.g. 150 mg intramuscular), users may experience what is coined the "K-hole", a state of dissociation whose effects are thought to mimic the phenomenology of schizophrenia.[56]. This may include distortions in bodily awareness, such as the feeling that one's body is being tugged, or is gliding on silk, flying, or has grown very large or distended. Users often report feeling more skeletal or becoming more aware of their bones - the shape of their hands is also often of interest.[citation needed] Users may experience worlds or dimensions that are ineffable, all the while being completely unaware of their individual identities or the external world. Users have reported intense hallucinations including visual hallucinations, perceptions of falling, fast and gradual movement and flying, 'seeing God', feeling connected to other users, objects and the cosmos, experiencing psychic connections, and shared hallucinations and thoughts with adjacent users.
Users may feel as though their perceptions are located so deep inside the mind that the real world seems distant (hence the use of a "hole" to describe the experience). Some users may not remember this part of the experience after regaining consciousness, in the same way that a person may forget a dream. Owing to the role of the NMDA receptor in long-term potentiation, this may be due to disturbances in memory formation. The "re-integration" process is slow, and the user gradually becomes aware of surroundings. At first, users may not remember their own names, or even know that they are human, or what that means. Movement is extremely difficult, and a user may not be aware that he or she has a body at all. [57]