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Guilherme Messas

Department of Mental Health, Santa Casa de São Paulo School of Medical Sciences, Sao Paulo, Brazil.

2 papers in the library · 232 citations · publishing 2022-2025

Papers

The lived experience of psychosis: a bottom-up review co-written by experts by experience and academics.

World psychiatry : official journal of the World Psychiatric Association (WPA) June 1, 2022 Paolo Fusar-Poli, Andrés Estradé, Giovanni Stanghellini et al. 225 citations

Psychosis unfolds through distinct stages, each with its own core existential experiences. Early phases (premorbid and prodromal) involve loss of common sense, perplexity, lack of immersion in the world, heightened salience, a feeling that something important is about to happen, perturbation of the sense of self, and a need to hide inner turmoil. The first episode brings transitory relief from delusions, intense self-referentiality, permeated self-world boundaries, internal noise, and dissolution of self with social withdrawal. Later stages (relapsing and chronic) involve grieving losses, feeling split, and struggling to accept inner chaos, a new self, diagnosis, and uncertain future. Treatment experiences include both positive and negative aspects, with recovery understood as reconstructing personhood and re-establishing bonds toward meaningful goals.

Modern perspectives on psychoses: dissociation, automatism, and temporality across exogenous and endogenous dimensions.

Frontiers in psychiatry January 1, 2025 Valerio Ricci, Maria Celeste Ciavarella, Carlotta Marrangone et al. 7 citations

Substance-induced psychoses (SIPs) triggered by novel psychoactive substances differ from endogenous psychoses like schizophrenia in three key ways: dissociation, mental automatism, and temporality. Dissociation in SIPs causes fragmentation of consciousness and identity detachment, distinct from the spaltung seen in schizophrenia. Mental automatism, as described by De Clerambault, appears early in SIPs with cognitive disruptions preceding delusions. Temporally, SIPs trap individuals in an eternal present, disconnected from past and future, unlike the fragmented temporality in schizophrenia. The paper argues that a phenomenological approach aids clinical differentiation and targeted interventions.