 Of note is a study investigating the efficacy of using psilocybin as an aid to psychotherapy in overcoming depression and nicotine addiction, a brain imaging study investigating the effects of psilocybin and MDMA on cerebral blood supply, an examination of the effects of cannabis on creativity and of the importance of the THC/CBD ratio in mental health, and the first brain imaging study investigating the effects of LSD on the brain.Feilding has also been active in drug policy reform and was among the first to start building an evidence-base upon which new policies could be formed, arguing that benefits as well as harms should be considered.In 2007, Feilding convened the Global Cannabis Commission, producing a report authored by a group of leading drug policy analysts, which lays out a plan for possible reforms of cannabis control policies at national and international levels.