E
Eef L. Theunissen
Researcher at Maastricht University
Publications - 96
Citations - 3376
Eef L. Theunissen is an academic researcher from Maastricht University. The author has contributed to research in topics: Cannabis & Poison control. The author has an hindex of 27, co-authored 89 publications receiving 2687 citations. Previous affiliations of Eef L. Theunissen include Centre national de la recherche scientifique.
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Journal ArticleDOI
High-Potency Marijuana Impairs Executive Function and Inhibitory Motor Control
Johannes G. Ramaekers,Gerhold Kauert,Peter van Ruitenbeek,Eef L. Theunissen,Erhard Schneider,Manfred R. Moeller +5 more
TL;DR: The data suggest that high potency marijuana consistently impairs executive function and motor control and use of higher doses of THC in controlled studies may offer a reliable indication of THC induced impairment as compared to lower doses that have traditionally been used in performance studies.
Journal ArticleDOI
Neurocognitive performance during acute THC intoxication in heavy and occasional cannabis users
Johannes G. Ramaekers,Gerold F. Kauert,Eef L. Theunissen,Stefan W. Toennes,Manfred R. Moeller +4 more
TL;DR: The data indicate that cannabis use history strongly determines the behavioural response to single doses of THC, and THC significantly impaired performance of occasional cannabis users on critical tracking, divided attention and the stop signal task.
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Cognition and motor control as a function of Delta9-THC concentration in serum and oral fluid: limits of impairment.
Johannes G. Ramaekers,Manfred R. Moeller,P. van Ruitenbeek,Eef L. Theunissen,Erhard Schneider,Gerold F. Kauert +5 more
TL;DR: Serum THC concentrations between 2 and 5 ng/ml establish the lower and upper range of a THC limit for impairment, which is associated with increased risk of becoming involved in traffic accidents.
Journal ArticleDOI
Tolerance and cross-tolerance to neurocognitive effects of THC and alcohol in heavy cannabis users
Johannes G. Ramaekers,Eef L. Theunissen,Marjolein de Brouwer,Stefan W. Toennes,Manfred R. Moeller,Gerhold Kauert +5 more
TL;DR: It is generally confirmed that heavy cannabis users develop tolerance to the impairing effects of THC on neurocognitive task performance, and the presence of the latter even selectively potentiated THC effects on measures of divided attention is confirmed.
Journal ArticleDOI
Ayahuasca enhances creative divergent thinking while decreasing conventional convergent thinking
Kim P. C. Kuypers,Jordi Riba,M. De la Fuente Revenga,Steven A. Barker,Eef L. Theunissen,Johannes G. Ramaekers +5 more
TL;DR: The present data suggest that ayahuasca increases psychological flexibility, which may facilitate psychotherapeutic interventions and support clinical trial initiatives.