Cognitive disconnection + Memantine
Memantine is known to produce cognitive disconnection, a cognitive effect. Cognitive disconnection is the experience of feeling profoundly detached from one's own thoughts, sense of identity, and mental processes — as though awareness has been severed from the cognitive systems that normally generate the feeling of being a coherent, thinking self.
About Cognitive disconnection
Cognitive disconnection describes a state in which the usual sense of ownership over and identification with one's thoughts, memories, and cognitive processes is markedly diminished or entirely absent. Under normal circumstances, there is an unquestioned feeling that "I am thinking these thoughts" — a seamless integration of awareness with mental content. During cognitive disconnection, this integration breaks down. Thoughts may still arise, but they feel distant, foreign, or as though they belong to someone else. The person's sense of self may feel hollowed out, attenuated, or simply absent.
The experience exists on a spectrum of intensity. At milder levels, it may manifest as a sense of psychological distance from one's own internal monologue — thoughts are observed rather than owned, as if watching a stream of consciousness from a detached vantage point. At moderate levels, the disconnection extends to encompass one's sense of personal history and identity — the usual sense of "who I am" feels like an abstraction rather than a lived reality. At profound levels, cognitive disconnection can feel as though consciousness has been entirely stripped of its contents, leaving behind only bare awareness without personality, memory, or conceptual framework. This deeper end of the spectrum overlaps with what is commonly described as ego death orego dissolution.
The phenomenology of cognitive disconnection is distinct from simple sedation or cognitive suppression. The person is not necessarily less aware — in fact, awareness may feel paradoxically heightened or clarified — but the usual sense of being a particular person with a particular mind has been disrupted. Some describe it as the difference between "the lights being off" (sedation) and "the lights being on but nobody being home" (cognitive disconnection).
Cognitive disconnection is a defining feature of dissociative substances — ketamine, DXM, PCP, and nitrous oxide all produce this effect as a core component of their subjective profile. It also occurs with high doses ofpsychedelics, particularly during peak experiences, and can be a feature ofcannabis intoxication in sensitive individuals. The effect typically manifests alongside related states includingdepersonalization,derealization,memory suppression, and various forms ofego dissolution.
Harm reduction note: Cognitive disconnection can be a profoundly disorienting experience, particularly for first-time users of dissociative substances who may not be prepared for the feeling of losing contact with their own identity. Having a trusted companion present and being in a physically safe environment are especially important when exploring doses likely to produce this effect. While cognitive disconnection is temporary and resolves as the substance wears off, the experience can be psychologically impactful and benefit from integration afterward.