title: Evaluation of cognitive brain functions in caffeine users: a P3 evoked potential study.
abstract: Caffeine is one of the most widely consumed stimulant drugs of the modern world. It brings about a feeling of well-being, relaxation, increased alertness and concentration. Its effects have been studied on brain function and behavior using mood questionnaires, reaction time tests, memory tests, EEG and of late Event Related Potentials (ERPs). This study evaluates the response of caffeine on ERPs and Reaction Time (RT) using auditory "oddball" paradigm. Forty undergraduate medical students volunteered for the study and their ERPs and RT were recorded before and after 40 minutes of ingestion of caffeine. There was a non-significant decrease in latency of N1, P2, N2 and P3 and a significant decrease in Reaction Time after caffeine consumption. The amplitude of P3 showed a significant increase after intake of caffeine. The results of this study indicate that caffeine leads to facilitation of information processing and motor output response of the brain.
authors.affiliation: Department of Physiology, University College of Medical Sciences and G.T.B. Hospital, Dilshad Garden, Delhi 110 095. abhinavdr@yahoo.com
authors.forename: Abhinav
authors.initials: A
authors.lastname: Dixit
authors.forename: Neelam
authors.initials: N
authors.lastname: Vaney
authors.forename: O P
authors.initials: OP
authors.lastname: Tandon
mesh_terms: D000293:Adolescent; D000328:Adult; D001921:Brain / Q000187:drug effects* / Q000502:physiology; D002110:Caffeine / Q000494:pharmacology*; D003071:Cognition / Q000187:drug effects*; D005071:Evoked Potentials / Q000187:drug effects*; D006801:Humans; D008297:Male; D011930:Reaction Time / Q000187:drug effects; D011954:Receptors, Dopamine / Q000187:drug effects; D018047:Receptors, Purinergic P1 / Q000187:drug effects
chemical_list: D011954:Receptors, Dopamine; D018047:Receptors, Purinergic P1; D002110:Caffeine