Showing papers by "Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto published in 1975"
TL;DR: The results suggest that the increases in keypecking rate caused by apomorphine in some pigeons in a conventional operant situation are due to the orientation of the drug-induced stereotyped pecking toward the response-key, as a consequence of the topographic compatibility between this behavioral effect of apomorphicine and the operant selected for study.
Abstract: Key-pecking and treadle-pressing behavior were maintained in five pigeons by a mult. FI 5 key FI 5 treadle schedule of food presentation. Dose-effect curves for apomorphine and amphetamine on overall rates of responding in both FI components of the multiple schedule were determined. Effective doses of apomorphine caused dose-dependent decreases on treadle-pressing rates in all animals. Similarly, key pecking rates were decreased by increasing doses of apomorphine in two of the five pigeons. However, dose-dependent increases in key-pecking rates were caused by apomorphine in the other three birds. In this group of pigeons, the mean key-pecking rate was increased to over 500 % of the control rate by the dose of 1 mg/kg of apomorphine. Observation of the animals under the effect of apomorphine showed continuous pecking at the operative key in these three animals while the other two pecked at different places of the floor and walls of the experimental chamber. Appropriate doses of amphetamine caused rate-increasing effects on key-pecking as well as treadle-pressing rates of all pigeons. These results suggest that the increases in keypecking rate caused by apomorphine in some pigeons in a conventional operant situation are due to the orientation of the drug-induced stereotyped pecking toward the response-key, as a consequence of the topographic compatibility between this behavioral effect of apomorphine and the operant selected for study.
21 citations
TL;DR: In this article, mixed complexes of cadmium(II) ions with nitrate and azide ions, using nitrate to adjust the ionic strength of the working solutions, have been detected by polarographic analysis.
3 citations
TL;DR: In this article, the nature of the reaction product between La(III) and ECR has been investigated and an empirical formula proposed for the observed lake, which does not possess a definite structure, the composition of the isolated product being dependent on the experimental conditions and composition of solution.
Abstract: The nature of the reaction product between La(III) and ECR has been investigated and an empirical formula proposed for the observed lake. Chemical analysis of the lake demonstrated it does not possess a definite structure, the composition of the isolated product being dependent on the experimental conditions and composition of the solution. X-ray studies revealed the amorphous nature of the isolated product. D. T. A. study of the product was made and a decomposition sequence is proposed for the same.