This cluster of papers focuses on the efficacy, safety, and mechanisms of action of electroconvulsive therapy (ECT) in the treatment of various psychiatric conditions such as depression, bipolar disorder, catatonia, and neuroleptic malignant syndrome. It also explores the association between ECT and serotonin syndrome, as well as the cognitive effects and hippocampal volume changes associated with ECT. Additionally, it discusses the use of magnetic seizure therapy as an alternative to traditional ECT.