Pepplinkhuizen, L.

patient group glycine serine psychosi study control psychose symptom effect dopamine loading brain schizophrenia state porphyria haloperidol reaction disturbance metabolism brain activation affective disorder smoker result psychiat substance activation perception picture disease change enzyme medication episode methyl processing addition stimuli hallucinogenic hypothesis experience folate methionine level hallucinations formation synthesis deficiency psychiatry porphyrin dysperception right activity placebo table bromocriptine loading tests treatment conversion receptor folic acid illness concentration serine-glycine metabolism hallucinogenic substances difference depersonalization one-carbon factor urine folic administration schizoaffective prefrontal syndrome excretion delusion loading test methylation