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Bradley PB, Elkes C, Elkes J. 
“On some effects of lysergic acid diethylamide (L.S.D. 25) in normal volunteers”. 
J. Physiol.. 1953;121:50P.
Abstract
Rhythmic photic stimulation enhanced the symptoms due to LSD (15-100 mcg orally) in 12 of 15 subjects. An incommunicative trance-like state was noted during photic stimulation in 6 cases. (slight transient alteration in muscle tone in 3 cases) EEG studies in 13 subjects.
Notes # : London
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