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1. The anorectic and motor activity effects of 1-aminoindane, 2-aminoindane, some N-substituted 2-aminoindanes, 2-aminotetralin, amphetamine and fenfluramine were determined in rats. 2. The two compounds with structures most like the extended conformation of amphetamine, 2-aminotetralin and 2-aminoindane, were potent anorectics. At dosages which halved the intake of food over 1 h, amphetamine increased motor activity, 2-aminotetralin had no effect, and 2-aminoindane reduced motor activity. 3. Both the anorectic and central stimulant actions of 2-aminoindane were absent in N-ethyl- and N-isopropyl-2-aminoindane. 4. 1-Aminoindane, whose structure is like the folded conformation of amphetamine, produced a small anorectic effect and depressed motor activity.