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Four male Sprague-Dawley rats pressed a lever for food reinforcers delivered by a multiple variable interval 1-min variable interval 1-min schedule. Components alternated every 5 min. The force required to move the lever was 0.25, 0.15, 1.10, 0.75, and 0.50 N in different conditions. Changes in...
Fersen et al. (1991) (J. Exp. Psychol.: Anim. Behav. Process., 17: 334–341) trained pigeons to discriminate four overlapping pairs of stimuli A + B −, B + C −, C + D − and D + E − (+ rewarded, − penalized). When subsequently tested with a pair BD the pigeons showed a strong preference...
Experiment 1 trained three pigeons on a six-key oddity-from-sample procedure. At trial onset, one of two compound color-form sample stimuli was presented (a white ‘X’ on a red background or a white circle on a green background). Every second peck on the sample key lighted another comparison...
In a previous work, we have described an increase of agonistic behaviour 24 h after a single 30-min restraint (RT) in female rats. The present work was aimed at assessing whether this effect was actually due to physical immobilization or was a mere consequence of the exposure to a novel...
In a study of the effects of age on cue utilization, groups of young and old rats were administered three versions of a non-matching-to-sample task that could be solved only by using spatial stimuli, local stimuli, or response cues respectively. The delay between sample and test runs was varied...
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