Abstract
Writing is a motor act which is acquired early in life and the performance thereafter remains stable over long periods of time in adult individuals. Successive samples are, thus unlikely to be affected by further practice (1). At the same time, handwriting, being a complex motor act requiring fine co-ordination should be more sensitive to the effects of psychoactive agents than simple skills (2). Further, repeated samples of handwriting can be obtained easily and quickly.
In the present investigation effects of four psychoactive agents, caffeine, chlorpromazinc, methamphetamine and phenobarbitone, on handwriting have been studied. A preliminary report of the work has appeared (3).
