Biomedical subjects
Publications and source records attributed to P N Witt.
Webs of Araneus diadematus Cl. were obtained under drugged (dextroamphetamine) and control conditions at three age-periods in the development of the spider from juvenility to sexual maturity. Although certain features of construction are affected in all periods and some exhibit differential effects with age, it was not possible to separate the latter from changes in body mass between periods.
Free ranging troops of 18--25 rhesus macaques were housed in large enclosures where a few higher-ranking monkeys were given psychotropic agents (delta 9THC: 4 mg/kg or d-amphetamine: 2 mg/kg). Measures of group spacing were (1) mean distance between all animals. (2) daily variance in mean distance, (3) nearest neighbor distance, (4) daily variance in nearest neighbor distance, (5) index of clumping (S2/mean ratio), (6) % touching, and (7) % movement/2 sec. When 3--4 animals were drugged, the entire group moved closer together and distances were more variable. Acute changes after the first week of delta 9THC and effects after delta 9THC withdrawal were seen in two experiments. Chronic behavioral changes were found for d-amphetamine and in one delta 9THC experiment.
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