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Jonathan Williams

4 papers in the library · publishing 2005-2025

Papers

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Psychological Effects Related to Psychedelic Substance Use in the Previous 12 Months

European Journal of Psychology Open May 28, 2025 Jonathan Williams, P. Murphy

Abstract: Background: Although clinical trials of psychedelics have reported therapeutic benefits, the effects of illicit psychedelic use may be different because of drug quality and influences upon consumption circumstances. This study used a battery of psychological measures to examine the effects related to illicit psychedelic consumption. Method: Psychedelic use was an independent variable...

Can a mindfulness-informed intervention reduce aggressive behaviour in people with intellectual disabilities? Protocol for a feasibility study.

Pilot and Feasibility Studies September 20, 2016 Gemma Maria Griffith, Robert Jones, Richard Patrick Hastings et al.

Background: Approximately 10-20 % of adults with intellectual disabilities engage in challenging behaviours such as aggression, destructiveness, and self-injury, which are often accompanied by feelings of anger. The inability to manage anger can reduce quality of life. For example, aggression is a strong predictor of out-of-area placements and is a risk variable for abuse. Recent research...

DOI: 10.1186/s40814-016-0098-3 (opens in new tab) Full text (opens in new tab) Costs Aggressive behaviour Intellectual disability Feasibility study +2

How cannabis causes paranoia: using the intravenous administration of ∆9-tetrahydrocannabinol (THC) to identify key cognitive mechanisms leading to paranoia.

Schizophrenia Bulletin March 2015 Daniel Freeman, Graham Dunn, Robin Murray et al.

Paranoia is receiving increasing attention in its own right, since it is a central experience of psychotic disorders and a marker of the health of a society. Paranoia is associated with use of the most commonly taken illicit drug, cannabis. The objective was to determine whether the principal psychoactive ingredient of cannabis-∆(9)-tetrahydrocannabinol (THC)-causes paranoia and to use the drug...