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Jarvik ME, Abramson HA, Hirsch MW. 
“Lysergic acid diethylamide (LSD-25): IV. Effect on attention and concentration.”. 
J. Psychol.. 1955;39:373.
Abstract
The effects of LSD (50 and 100 mcg. orally) and placebo on attention and concentration were studied in 12 non-psychotic adults by means of various psychological tests (e.g. marking of particular figures in a mass of similar figures). 6 out of the 8 tests showed no significant difference between the scores after placebo and after 50 mcg. LSD. Two tests showed a significant difference between the scores after placebo and 100 mcg. LSD. The decreases in the scores after LSD would probably have been even more significant if it had been possible to rule out the effect of practice.
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