Animal Learning & Behavior
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Grasping in the pigeon (Columba livid): Stimulus control during conditioned and consummatory responses
Animal Learning & Behavior - Tập 12 - Trang 223-231 - 1984
Control of beak opening (gape) and peck location was examined in pigeons. Feeding pecks showed accurate guidance that positioned the seed between the beaks. At the moment of contact with the seed, gape was proportional to seed diameter, although pecks with gape less than seed diameter were more frequent following an increase in seed size during a meal. There were no substantial differences between...... hiện toàn bộ
Operant responding by bonnet macaques for color videotape recordings of social stimuli
Animal Learning & Behavior - Tập 8 - Trang 311-321 - 1980
Socially reared juvenile bonnet macaques responded at high sustained levels in an operant task for presentation of color videotaped television images of social stimuli. Absolute levels of response depended upon the nature of the stimulus. In two experiments, subjects responded at 60.8% and 74.6% of the 1-h experimental sessions for presentation of a color videotape of a conspecific adult female mo...... hiện toàn bộ
Behavioral contrast as a function of component duration for leverpressing using a within-session procedure
Animal Learning & Behavior - Tập 19 - Trang 71-80 - 1991
Ten rats pressed levers for food reinforcers delivered by multiple schedules. Behavioral contrast was measured using a within-session procedure that presented the baseline and contrast schedules within single sessions. The absolute sizes of both positive and negative contrast increased and then decreased as components lengthened. Negative induction occurred when components were very short. These r...... hiện toàn bộ
Symmetrical and asymmetrical sources of variance in temporal generalization
Animal Learning & Behavior - Tập 19 - Trang 207-214 - 1991
Ten rats were trained in a temporal generalization task (the peak procedure) with variations in the time of reinforcement, the intertrial interval, and the mean and variance of the duration of nonfood trials. There were three types of asymmetry in the temporal generalization gradients: positive skew, secondary rise, and positive asymptote. Asymmetrical gradients can occur as a result of asymmetric...... hiện toàn bộ
Prolonged duration of the “novelty effect” following prolonged exposure to a single discriminandum
Animal Learning & Behavior - Tập 1 Số 3 - Trang 233-236 - 1973
Rats were exposed for approximately 1 month to a single stimulus mounted on the home cage wall. During discrimination training, half of the Ss had the exposed figure as the positive stimulus and half the exposed figure as the negative stimulus. Control Ss had no pattern mounted on the wall. The results indicate that when the exposed figure was the positive stimulus, the Ss made significantly more ...... hiện toàn bộ
Ontogeny of persistence: Immediate extinction effects in preweanling and weanling rats
Animal Learning & Behavior - Tập 4 - Trang 131-138 - 1976
In Experiment I rats were trained for 21÷2 days under partial (PRF) or continuous reinforcement (CRF) conditions starting at 18, 22, 28, or 36 days of age and were then subjected to immediate extinction. At all ages there was a strong partial reinforcement extinction effect (PREE), and absolute size of PREE was greatest in the youngest rats. Rate of extinction increased as a function of age follow...... hiện toàn bộ
19th Annual Meeting of the Society for Computers in Psychology Atlanta, Georgia November 16, 1989
Animal Learning & Behavior - Tập 17 - Trang 279-279 - 1989
Intuitive statistical inference: How pigeons categorize binomial samples
Animal Learning & Behavior - Tập 18 - Trang 401-409 - 1990
Pigeons categorized binomial samples produced by two complementary random processes. Samples were 1, 2, 4, or 8 successively presented outcomes (vertical or horizontal lines) of, in effect, tossing one of two equally likely coins. One coin (A) was biased in favor of vertical, and the other coin (B) was similarly biased in favor of horizontal. Choosing red or green stimuli presented after each samp...... hiện toàn bộ
Errors in pigeons’ memory for number of events
Animal Learning & Behavior - Tập 29 - Trang 208-220 - 2001
In Experiment 1, pigeons were trained in a within-subjects design to discriminate sequences of light flashes (illumination of the feeder) that varied in number, but not in time (2f/4sec and 8f/4sec), and in time, but not in number (4f/2sec and 4f/8sec). Number samples required a response to one of two comparison dimensions (either color or line), whereas time samples required a response to the rem...... hiện toàn bộ
Preference for food and water in rats as a function of delay of reward
Animal Learning & Behavior - Tập 4 - Trang 299-302 - 1976
In Experiment I, rats which were both hungry and thirsty were given a choice between a food reward and a water reward. The animals preferred food to water when the reward was delivered immediately, but preferred water to food when a 30-sec delay was imposed in the goalbox before the reward was received. Experiment II replicated the results of the first experiment and showed, in addition, that when...... hiện toàn bộ
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