A disturbed sense of self, particularly feeling disconnected from one's own body (disembodiment), may contribute to delusions in psychosis. In a randomized experiment, 73 patients with psychosis either performed a 10-minute guided self-massage to enhance bodily boundary awareness or massaged a fabric ring. Those who did the self-massage showed a reduced tendency to jump to conclusions (an average of 4.11 pieces of evidence before deciding versus 2.43 in the control group, a moderate effect). However, there was no significant difference in explicit paranoid beliefs. The findings suggest that improving the sense of bodily boundaries can reduce an implicit bias linked to delusional thinking, supporting the idea that disembodiment plays a role in psychotic symptoms.
Ketamine, administered intravenously at subnarcotic doses, has emerged as a rapid-acting treatment for treatment-resistant depression. This historical overview traces its development, compares it with the newer esketamine nasal spray, and discusses future prospects. Intravenous ketamine infusions have shown efficacy in rapidly reducing depressive symptoms, while esketamine, a derivative, offers a more convenient nasal route but may have different efficacy and safety profiles. The article highlights the need for further research to optimize dosing, duration of effect, and long-term outcomes, as well as to understand the mechanisms underlying ketamine's antidepressant action.