Hannes Kettner, MSc
Postdoctoral Scholar
Neurology
School of Medicine

Publications (46)

Top publication keywords:
EnvironmentNatureN-Methyl-3,4-methylenedioxyamphetamineAnxietyEgoPsychotherapyMindfulnessDepressionPsilocybinPersonal SatisfactionN,N-DimethyltryptamineProspective StudiesDrug UsersPsychotropic DrugsHallucinogens

• Effects of psychedelic use on authoritarian attitudes revisited.
  Journal of psychopharmacology (Oxford, England) 2026 Simonsson O, Lyons T, Marks J, Kettner H, Roseman L, Haijen E, Kaelen M, Carhart-Harris R
• Baseline Mood and "Relational Triad" Predict Acute Qualities of Psychedelic Experience.
  Behavioral sciences (Basel, Switzerland) 2026 Lipson J, Kettner H, Carhart-Harris R, Miller L
• Exploring the potential psychological predictors associated with changes in depression, anxiety, and well-being following naturalistic psychedelic use.
  Journal of psychiatric research 2025 Herrmann FM, Jones G, Low DM, Zech JM, Carhart-Harris RL, Kettner H
• Validation of the Imperial Psychedelic Predictor Scale - CORRIGENDUM.
  Psychological medicine 2025 Angyus M, Osborn S, Haijen E, Erritzoe D, Peill J, Lyons T, Kettner H, Carhart-Harris R
• Psychedelic Therapy, Positive Emotional Experiences, and the Central Role of Self-Compassion.
  Research square 2025 Zeifman R, Danias G, Agin-Liebes G, Pagni B, Kettner H, Bhat V, Ross S, Erritzoe D, Carhart-Harris R

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• Improved mental health outcomes and normalised spontaneous EEG activity in veterans reporting a history of traumatic brain injuries following participation in a psilocybin retreat.
  Frontiers in psychiatry 2025 Blest-Hopley G, Pasculli G, Ruffell SGD, Tsang W, Emmanuel O, Pate KM, Kettner H, Roseman L, Erritzoe D, Carhart-Harris R
• Exploring the Therapeutic Effects of Psychedelics Administered to Military Veterans in Naturalistic Retreat Settings.
  Brain and behavior 2025 Calnan M, Blest-Hopley G, Busch C, Adams M, Ruffell SGD, Piper T, Roseman L, Kettner H, Carhart-Harris R
• A Scoping Review of Research in Naturalistic Studies with Psychedelics.
  Journal of psychoactive drugs 2025 Carvalho LC, Encantado J, Kettner H, Timmermann C, Veiga D, Teixeira PJ
• Enhanced meaning in life following psychedelic use: converging evidence from controlled and naturalistic studies.
  Frontiers in psychology 2025 Roseby W, Kettner H, Roseman L, Spriggs MJ, Lyons T, Peill J, Giribaldi B, Erritzoe D, Nutt DJ, Carhart-Harris RL
• Prediction of hallucinogen persisting perception disorder and thought disturbance symptoms following psychedelic use.
  PNAS nexus 2025 Zhou K, de Wied D, Carhart-Harris RL, Kettner H
• Dynamic medial parietal and hippocampal deactivations under DMT relate to sympathetic output and altered sense of time, space, and the self.
  Imaging neuroscience (Cambridge, Mass.) 2025 Pasquini L, Simon AJ, Gallen CL, Kettner H, Roseman L, Gazzaley A, Carhart-Harris RL, Timmermann C
• From relaxed beliefs under psychedelics (REBUS) to revised beliefs after psychedelics (REBAS).
  Scientific reports 2025 Zeifman RJ, Spriggs MJ, Kettner H, Lyons T, Rosas FE, Mediano PAM, Erritzoe D, Carhart-Harris RL
• Preliminary Evidence of Sleep Improvements Following Psilocybin Administration, and their Involvement in Antidepressant Therapeutic Action.
  Current psychiatry reports 2024 Reid MJ, Kettner H, Blanken TF, Weiss B, Carhart-Harris R
• Examining differences in the effects and contexts of naturalistic psilocybin use for White participants vs. Participants of Color: A longitudinal online survey study.
  Journal of affective disorders 2024 Jones G, Lowe MX, Nayak S, Sepeda N, Kettner H, Carhart-Harris R, Jackson H, Garcia-Romeu A
• Validation of the imperial psychedelic predictor scale.
  Psychological medicine 2024 Angyus M, Osborn S, Haijen E, Erritzoe D, Peill J, Lyons T, Kettner H, Carhart-Harris R
• Reply to Letter to the Editor: "Psychedelics in Older Adults: Difficulties of a Clear Therapeutic Evidence".
  The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry 2024 Kettner H, Roseman L, Gazzaley A, Carhart-Harris RL, Pasquini L
• Dynamic medial parietal and hippocampal deactivations under DMT relate to sympathetic output and altered sense of time, space, and the self.
  bioRxiv : the preprint server for biology 2024 Pasquini L, Simon AJ, Gallen CL, Kettner H, Roseman L, Gazzaley A, Carhart-Harris RL, Timmermann C
• Longitudinal experiences of Canadians receiving compassionate access to psilocybin-assisted psychotherapy.
  Scientific reports 2024 de la Salle S, Kettner H, Thibault Lévesque J, Garel N, Dames S, Patchett-Marble R, Rej S, Gloeckler S, Erritzoe D, Carhart-Harris R, Greenway KT
• Psychological effects of psychedelics in adolescents.
  Frontiers in child and adolescent psychiatry 2024 Izmi N, Carhart-Harris RL, Kettner H
• Effects of Psychedelics in Older Adults: A Prospective Cohort Study.
  The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry 2024 Kettner H, Roseman L, Gazzaley A, Carhart-Harris RL, Pasquini L
• Long-term benefits to psychological health and well-being after ceremonial use of Ayahuasca in Middle Eastern and North African immigrants and refugees.
  Frontiers in psychiatry 2024 Lowe MX, Kettner H, Jolly DRP, Carhart-Harris RL, Jackson H
• Improvements in well-being following naturalistic psychedelic use and underlying mechanisms of change in older adults: A prospective cohort study.
  Research square 2024 Kettner H, Roseman L, Gazzaley A, Carhart-Harris R, Pasquini L
• Psychiatric risks for worsened mental health after psychedelic use.
  Journal of psychopharmacology (Oxford, England) 2024 Marrocu A, Kettner H, Weiss B, Zeifman RJ, Erritzoe D, Carhart-Harris RL
• The Relationship Between Changes in Mindfulness and Subsequent Changes in Well-Being Following Psychedelic Use: Prospective Cohort Study.
  JMIR formative research 2024 Jones G, Herrmann F, Bear A, Carhart-Harris R, Kettner H
• Psychedelics and sexual functioning: a mixed-methods study.
  Scientific reports 2024 Barba T, Kettner H, Radu C, Peill JM, Roseman L, Nutt DJ, Erritzoe D, Carhart-Harris R, Giribaldi B
• Interactions between classic psychedelics and serotonergic antidepressants: Effects on the acute psychedelic subjective experience, well-being and depressive symptoms from a prospective survey study.
  Journal of psychopharmacology (Oxford, England) 2024 Barbut Siva J, Barba T, Kettner H, Kuc J, Nutt DJ, Carhart-Harris R, Erritzoe D
• Preliminary evidence for the importance of therapeutic alliance in MDMA-assisted psychotherapy for posttraumatic stress disorder.
  European journal of psychotraumatology 2024 Zeifman RJ, Kettner H, Ross S, Weiss B, Mithoefer MC, Mithoefer AT, Wagner AC
• The ego in psychedelic drug action - ego defenses, ego boundaries, and the therapeutic role of regression.
  Frontiers in neuroscience 2023 Buchborn T, Kettner HS, Kärtner L, Meinhardt MW
• Co-use of MDMA with psilocybin/LSD may buffer against challenging experiences and enhance positive experiences.
  Scientific reports 2023 Zeifman RJ, Kettner H, Pagni BA, Mallard A, Roberts DE, Erritzoe D, Ross S, Carhart-Harris RL
• Human brain effects of DMT assessed via EEG-fMRI.
  Proceedings of the National Academy of Sciences of the United States of America 2023 Timmermann C, Roseman L, Haridas S, Rosas FE, Luan L, Kettner H, Martell J, Erritzoe D, Tagliazucchi E, Pallavicini C, Girn M, Alamia A, Leech R, Nutt DJ, Carhart-Harris RL
• Among psychedelic-experienced users, only past use of psilocybin reliably predicts nature relatedness.
  Journal of psychopharmacology (Oxford, England) 2023 Forstmann M, Kettner HS, Sagioglou C, Irvine A, Gandy S, Carhart-Harris RL, Luke D
• Effects of psilocybin versus escitalopram on rumination and thought suppression in depression.
  BJPsych open 2022 Barba T, Buehler S, Kettner H, Radu C, Cunha BG, Nutt DJ, Erritzoe D, Roseman L, Carhart-Harris R
• The Watts Connectedness Scale: a new scale for measuring a sense of connectedness to self, others, and world.
  Psychopharmacology 2022 Watts R, Kettner H, Geerts D, Gandy S, Kartner L, Mertens L, Timmermann C, Nour MM, Kaelen M, Nutt D, Carhart-Harris R, Roseman L
• Antidepressant effects of a psychedelic experience in a large prospective naturalistic sample.
  Journal of psychopharmacology (Oxford, England) 2022 Nygart VA, Pommerencke LM, Haijen E, Kettner H, Kaelen M, Mortensen EL, Nutt DJ, Carhart-Harris RL, Erritzoe D
• Therapeutic Alliance and Rapport Modulate Responses to Psilocybin Assisted Therapy for Depression.
  Frontiers in pharmacology 2022 Murphy R, Kettner H, Zeifman R, Giribaldi B, Kartner L, Martell J, Read T, Murphy-Beiner A, Baker-Jones M, Nutt D, Erritzoe D, Watts R, Carhart-Harris R
• Validation of the Psychological Insight Scale: A new scale to assess psychological insight following a psychedelic experience.
  Journal of psychopharmacology (Oxford, England) 2022 Peill JM, Trinci KE, Kettner H, Mertens LJ, Roseman L, Timmermann C, Rosas FE, Lyons T, Carhart-Harris RL
• Psychedelics alter metaphysical beliefs.
  Scientific reports 2021 Timmermann C, Kettner H, Letheby C, Roseman L, Rosas FE, Carhart-Harris RL
• Psychedelic experience dose-dependently modulated by cannabis: results of a prospective online survey.
  Psychopharmacology 2021 Kuc J, Kettner H, Rosas F, Erritzoe D, Haijen E, Kaelen M, Nutt D, Carhart-Harris RL
• Turn on, Tune in, and Drop out: Predictors of Attrition in a Prospective Observational Cohort Study on Psychedelic Use.
  Journal of medical Internet research 2021 Hübner S, Haijen E, Kaelen M, Carhart-Harris RL, Kettner H
• Sustained, Multifaceted Improvements in Mental Well-Being Following Psychedelic Experiences in a Prospective Opportunity Sample.
  Frontiers in psychiatry 2021 Mans K, Kettner H, Erritzoe D, Haijen ECHM, Kaelen M, Carhart-Harris RL
• Psychedelics and health behaviour change.
  Journal of psychopharmacology (Oxford, England) 2021 Teixeira PJ, Johnson MW, Timmermann C, Watts R, Erritzoe D, Douglass H, Kettner H, Carhart-Harris RL
• Can pragmatic research, real-world data and digital technologies aid the development of psychedelic medicine?
  Journal of psychopharmacology (Oxford, England) 2021 Carhart-Harris RL, Wagner AC, Agrawal M, Kettner H, Rosenbaum JF, Gazzaley A, Nutt DJ, Erritzoe D
• Association Between Lifetime Classic Psychedelic Use and Hypertension in the Past Year.
  Hypertension (Dallas, Tex. : 1979) 2021 Simonsson O, Hendricks PS, Carhart-Harris R, Kettner H, Osika W
• Post-Psychedelic Reductions in Experiential Avoidance Are Associated With Decreases in Depression Severity and Suicidal Ideation.
  Frontiers in psychiatry 2020 Zeifman RJ, Wagner AC, Watts R, Kettner H, Mertens LJ, Carhart-Harris RL
• From Egoism to Ecoism: Psychedelics Increase Nature Relatedness in a State-Mediated and Context-Dependent Manner.
  International journal of environmental research and public health 2019 Kettner H, Gandy S, Haijen ECHM, Carhart-Harris RL
• Predicting Responses to Psychedelics: A Prospective Study.
  Frontiers in pharmacology 2018 Haijen ECHM, Kaelen M, Roseman L, Timmermann C, Kettner H, Russ S, Nutt D, Daws RE, Hampshire ADG, Lorenz R, Carhart-Harris RL