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Guilherme Messas

6 papers in the library · 232 citations · publishing 2022-2026

Papers

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From “Things” to Structures

Revista Psicopatologia Fenomenológica Contemporânea June 5, 2026 Guilherme Messas, Francesca Brencio

The general aim of this contribution is to discuss a dilemma which lies in the conception and exercise of psychiatry. This dilemma lies in the recognition that, on one hand the reified model for describing and understanding mental health is not sufficient for overcoming a Kraepelinian paradigm still influent in psychiatry; on the other hand, that despite this recognition we are still stuck with...

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

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

Substance use and the emergence of Novel Psychoactive Substances (NPS) present a significant public health challenge and diagnostic dilemma, particularly in the context of psychosis. The increasing availability of psychoactive substances among youth has led to a rise in Substance Use Disorders (SUDs), with profound implications for mental health. This paper explores the psychopathological...

DOI: 10.3389/fpsyt.2025.1543673 (opens in new tab) Full text (opens in new tab) Cannabis Dissociation Exogenous psychosis Mental automatism +3

Obsessive-compulsive existential type: a dialectical-phenomenological approach.

Frontiers in Psychology 2023 Lívia Fukuda, Melissa G Tamelini, Guilherme Messas

The clinical presentation of obsessive-compulsive patients is characterized by unwanted, intrusive, nonsensical, self-related, and recurrent ideas, thoughts, images, or impulses associated with active compulsive compensations. Under the operational diagnostic criteria adopted by the biological- and cognitive-oriented neopositivist medical paradigm, it is known as "obsessive-compulsive...

DOI: 10.3389/fpsyg.2023.1211598 (opens in new tab) Full text (opens in new tab) Phenomenology Anthropological disproportions Dialectical phenomenological psychopathology Dialectics +2

More phenomenology in psychiatry? Applied ontology as a method towards integration.

The Lancet Psychiatry July 1, 2022 R. R. Larsen, Luca F Maschião, Valter L. Piedade et al.

There have been renewed calls to use phenomenology in psychiatry to improve knowledge about causation, diagnostics, and treatment of mental health conditions. A phenomenological approach aims to elucidate the subjective experiences of mental health, which its advocates claim have been largely neglected by current diagnostic frameworks in psychiatry (eg, DSM-5). The consequence of neglecting...

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

World Psychiatry June 1, 2022 Paolo Fusar‐poli, Andrés Estradé, Giovanni Stanghellini et al. 225 citations

Psychosis is the most ineffable experience of mental disorder. We provide here the first co-written bottom-up review of the lived experience of psychosis, whereby experts by experience primarily selected the subjective themes, that were subsequently enriched by phenomenologically-informed perspectives. First-person accounts within and outside the medical field were screened and discussed in...

The Dialectics of Altered Experience: How to Validly Construct a Phenomenologically Based Diagnosis in Psychiatry.

Frontiers in Psychiatry April 12, 2022 Guilherme Messas, Lívia Fukuda, K W M Fulford

In this paper, we present how a dialectical perspective on phenomenological psychopathology, called Dialectical Phenomenology (DPh), can contribute to current needs of psychiatric diagnosis. We propose a three-stage diagnostic methodology: first- and second-person stages, and synthetic hermeneutics stage. The first two stages are divided into a pre-dialectical and a dialectical phase. The...

DOI: 10.3389/fpsyt.2022.867706 (opens in new tab) Full text (opens in new tab) Validity Hermeneutics Psychiatric diagnosis Dialectics +4