Papers and Posters Presented at the 33rd Annual Meeting of the Psychonomic Society The Adams' Mark Hotel, St. Louis, Missouri November 13–15, 1992

1992 Bulletin of the Psychonomic Society  
College-Rats were allowed, for various periods of time, to press a lever for which they received no consequence. They were then allowed to press to receive a food reward. The more animals pressed during the preexposure period, the lower the rate of subsequent learning. Such latent inhibition for responding appears to dependon total amountof prior exposureto unrewarded leverpressing and is comparable to conventional latent inhibition using stimuliin several interesting ways. 8:15-8:30 (2) Latent
more » ... Inhibition From Exposure to Compound Stimuli in Developing Rats. DAVID L. McKINZIE, Binghamton University, WEI-JUNG CHEN, University ofIowa, & NORMAN E. SPEAR, Binghamton University (read by Norman E. Spear)-Latent inhibition in Pavlovian conditioning of A was greater in infant rats following prior exposure to a simultaneous stimulus compound (AB) or a more intense version of A than to A alone or both A and B presented sequentially. These effects differ from those observed in adults and suggest an infantile disposition for configuring simultaneous compounds and encoding the net result amodally in terms of intensity. 8:35-8:45 (3) Anticipatory Contrast. Choice. and Devaluation. CHARLESFLA-HERTY & CYNTHIA COPPOTELLI, Rutgers University-Rats given brief, daily, sequential access to 0.15 % saccharin followed by 32% sucrose consume less saccharin than rats given two access periods to the saccharin. Is this anticipatory contrast effect due to the devaluation of the initial saccharin solution because it precedes the preferred 32% sucrose? Data will be presented from choice tests (saccharin that predicts 32% sucrose versus saccharin that predicts saccharin) and from experiments in which the 32% sucrose is devalued after the development of anticipatory contrast. 8:50-9:05 (4) Range Effects and Dimensional Contrast With Multidimensional Stimuli. JOHN M. HINSON & LINDA R. TENNISON, Washington State University-Pigeons were trained to discriminate one-and twodimensional visual stimuli. In some cases, stimulus range was extended to assess changes in discrimination of unchanged stimulus values. Dimensional contrast was observed with both unidimensional and multidimensional stimuli. Range effects were also observed in both stimulus sets. Dimensionalcontrast and range effects in these studies can be explained in terms of changes in attentional allocation. 9:16-9:25 (5)
doi:10.3758/bf03334109 fatcat:5wkarsmzpbha5nlmx3pbut3kva