J. Daumann

Publications69
h-index31
Citations2,599
Highly Influential Citations181
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The role of cannabis in cognitive functioning of patients with schizophrenia
RationaleCognitive deficits are commonly found both in patients with schizophrenia (SCH) and in people with cannabis use disorders (CUD). Surprisingly, some small recent studies reported better… Expand
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Memory impairment suggests hippocampal dysfunction in abstinent ecstasy users
Previous studies have consistently shown impairments of memory and learning in regular users of the neurotoxic drug ecstasy (3,4-methylenedioxymethamphetamine [MDMA]). In addition, deficits in… Expand
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High Intensity Dependence of Auditory Evoked Dipole Source Activity Indicates Decreased Serotonergic Activity in Abstinent Ecstasy (MDMA) Users
Neurotoxic damage of central serotonergic systems has been demonstrated in numerous animal studies after exposure to methylenedioxyamphetamines (ecstasy). A high intensity dependence of auditory… Expand
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Self-reported psychopathological symptoms in recreational ecstasy (MDMA) users are mainly associated with regular cannabis use: further evidence from a combined cross-sectional/longitudinal…
Rationale3,4-Methylenedioxymethamphetamine (MDMA, ecstasy) has become a widely used recreational drug among young people. This is of great concern, since MDMA is neurotoxic in animal studies and its… Expand
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Cerebral activation in abstinent ecstasy (MDMA) users during a working memory task: a functional magnetic resonance imaging (fMRI) study.
The popular recreational drug ecstasy (3,4-methylenedioxymethamphetamine=MDMA and related congeners) is neurotoxic upon central serotonergic systems in animal studies. So far, the most convincing… Expand
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Impaired cognitive performance in drug free users of recreational ecstasy (MDMA)
OBJECTIVES Ecstasy (3,4-methylenedioxymethamphetamine (MDMA) and related congerers: MDA, MDEA) is the name given to a group of popular recreational drugs. Animal data raise concern about neurotoxic… Expand
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Mismatch negativity generation in the human 5HT2A agonist and NMDA antagonist model of psychosis
RationaleMany studies have reported deficits of mismatch negativity (MMN) in schizophrenic patients. Pharmacological challenges with hallucinogens in healthy humans are used as models for psychotic… Expand
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The confounding problem of polydrug use in recreational ecstasy/MDMA users: a brief overview
The popular dance drug ecstasy (3,4-methylenedioxymethamphetamine -- MDMA) is neurotoxic upon central serotonergic neurons in laboratory animals and possibly also in humans. In recent years, several… Expand
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The impact of early-onset cannabis use on functional brain correlates of working memory
Cannabis is the most commonly used illicit drug. Prevalence rates are particularly high among adolescents. Neuropsychological studies have identified cannabis-associated memory deficits, particularly… Expand
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Correlation of passivity symptoms and dysfunctional visuomotor action monitoring in psychosis
Passivity experiences are hallmark symptoms of schizophrenia that can be characterized by the belief that one's thoughts or actions are controlled by an external agent. It has recently been suggested… Expand
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