Abstract
8 experienced users of “street-drugs” estimated the over-all similarity of 11 drug-substance combinations based on their own experiences with such combinations. Their similarity estimations were analyzed using multidimensional scaling procedures (namely, the Stone-Coles method). Four judgmental factor-dimensions were extracted and identified (tentative labels: I. Psychedelic drugs in combination with other substances vs pot in combination with downers; II. stimulant-depressant; III. psychedelic drugs vs other drugs, IV. LSD in combination with other substances) which accounted for 92% of the variance of the averaged similarity estimates. These particular judgmental factor-dimensions were similar to those extracted from judgments pertaining to single drugs as stimuli.
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