Linda Dreyfus

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In four experiments, pigeons were tested on a duration comparison task involving the successive presentation of two visual stimuli that varied in duration from trial to trial. Following presentation of the durations, two choice keys were lit, and reinforcement for choices was based on the temporal relation between duration of the pair. In Experiment 1, the(More)
Complex simulations can facilitate students' synthesis of knowledge. Simulations of cognitively impaired elders provide nursing students the opportunity to use critical thinking and clinical decision-making skills in complex patient care situations. The authors report their experiences in designing, implementing, and evaluating a simulation on cognitive(More)
Humans (Homo sapiens) were trained on 2 versions of a 2-alternative, forced-choice procedure. First, subjects judged which of 2 successive stimulus durations was longer. Second, subjects judged whether the ratio of the 2 durations was less or greater than a criterion ratio (e.g., 2:1). Accuracy was significantly lower for the task in which the judgment was(More)
Pigeons were trained to peck on a key, which could be lit by red or green light, and produce feeder-light stimuli intermittently. On some trials, food followed the fourth feeder flash providing the key color was red, while on other trials food followed the sixteenth flash providing the color was green. The change in color from red to green was produced by a(More)
Humans compared 2 durations according to different rules. Some judged which duration lasted longer, some judged whether the duration ratio was less or greater than 3:1, and others judged according to a same-different rule. Under each condition, 1/2 of the participants had advance knowledge of the rule, whereas the others acquired the discrimination solely(More)
Multiple-unit activity (MUA), recorded simultaneously from many brain areas, was used to detect the existence and location of ‘target sites’ for ethanol action in rabbits with chronically implanted electrodes in 14 areas. Each of 12 rabbits received intraperitoneal injection of 300, 600, 900, and 1200 mg/kg of 20% ETOH and a saline control injection given(More)
This study was a follow-up to our earlier data which indicated that the hippocampus was one of the brain areas in which ethanol had a preferential action. Rabbits were chronically implanted with electrodes in 9 brain areas associated with the hippocampus. The EEG and multiple-unit activity were recorded simultaneously in each area before and for 15 min(More)
Under a psychophysical trials procedure, pigeons were presented with a red light of one duration followed by a green light of a second duration. Eight geometrically spaced base durations were paired with one of four shorter and four longer durations as the alternate member of a duration pair, with different pairs randomly intermixed. One choice was(More)