Activities and information relating to dinosaurs are presented, including: study of warm- and cold-blooded animals; research about recent dinosaur discoveries; track-making; studying and making fossils; and extinction theories. (CB)

A study designed to investigate the effects of permanent maternal separation in infant rhesus monkeys, 60, 90, and 120 days of age, and housed individually or in Paris. Monkeys separated at 90 days and housed individually showed the highest levels of disturbance. (DP)

The use of a trained sea lion to locate and attach a retrieval device to submerged instruments and test equipment is described. (CP)

Reports recent studies which establish that maternal separation and early rearing conditions can influence the development and expression of immune responses of the primate infant. Current findings extend an earlier finding on alterations in lymphocyte proliferation responses to a number of other immune parameters. (NH)

Provides English interpretations for a list of French expressions using animal imagery, focusing on those metaphors which are commonly used by contemporary French speakers. (CB)

In response to two articles on animal rights, dissection, and the classroom that appeared in the January 1992 issue of this journal, an education specialist at People for the Ethical Treatment of Animals (PETA) argues against holding animals captive in schools. (MLF)

Asserts that people have used animals in literature as long as there has been writing, because animals give people a way to characterize themselves. Argues that animals are being regarded in new, heroic ways in children's books, more and more without human distortions, but as heroes in their own right. (PRA)

Twelve pigeons were exposed to negative automaintenance contingencies for 17-27 sessions immediately after brief (14-16 sessions) or extended (168-237 sessions) exposure to positive automaintenance contingencies, or after 4-10 sessions of instrumental training. In all conditions, negative automaintenance contingencies virtually eliminated…

We investigated the effects of discriminative stimuli on choice in a highly variable environment using a procedure in which multiple two-key concurrent VI VI components changed every 10 reinforcers and were signaled by differential flashes of red and yellow keylights. Across conditions, five pigeons were exposed to a number of different…

Pigeons were trained on many-to-one matching in which pairs of samples, each consisting of a visual stimulus and a distinctive pattern of center-key responding, occasioned the same reinforced comparison choice. Acquired equivalence between the visual and response samples then was evaluated by reinforcing new comparison choices to one set of…

Dose-dependent changes in sensitivity to reinforcement were found when rats were treated with low, moderate, and high doses of the partial dopamine D[subscript 1]-type receptor agonist SKF38393 and with the nonselective dopamine agonist apomorphine, but did not change when rats were treated with similar doses of the selective dopamine D[subscript…