Search Results - "Mellgren, Roger L."

Sex differences in the acquisition of a radial maze task in the CD-1 mouse by LaBuda, Christopher J, Mellgren, Roger L, Hale, Robert L

“…The purpose of the present study was to investigate spatial processing performance in male and female CD-1 mice. A substantial literature supports the…”
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A neural network model of foraging decisions made under predation risk by COLEMAN, Scott L, BROWN, Vincent R, LEVINE, Daniel S, MELLGREN, Roger L

“…This article develops the cognitive-emotional forager (CEF) model, a novel application of a neural network to dynamical processes in foraging behavior. The CEF…”
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Social Enhancement and Interference of Food Finding in Zebra Finches (Taeniopygia guttata ) by Coleman, Scott L, Mellgren, Roger L

“…In Experiment 1, pairs of naive zebra finches were allowed to find food in a same (local enhancement) or a different (local interference) location and in the…”
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Language, Signs, and Cognition in the Chimpanzee by Fouts, Roger S, Mellgren, Roger L

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FORAGING IN A SIMULATED NATURAL ENVIRONMENT: THERE'S A RAT LOOSE IN THE LAB by Mellgren, Roger L.

“…Rats were required to earn their food in a large room having nine boxes placed in it, each of which contained food buried in sand. In different phases of the…”
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Optimal foraging theory: Prey density and travel requirements in Rattus norvegicus by MELLGREN, R. L, MISASI, L, BROWN, S. W

“…Two male Wistar hooded rats were allowed to forage for food by climbing nail ladders to a box containing prey mixed with sand (a patch) to investigate how…”
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DISCRIMINATION LEARNING IN A FORAGING SITUATION by Mellgren, Roger L., Brown, Steven W.

“…Rats were allowed to forage in a simulated natural environment made up of eight food sources (patches) each containing a fixed number of pellets. Two of the…”
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Positive contrast in the rat as a function of number of preshift trials in the runway by Mellgren, Roger L

“…Shifted 42 male sprague-dawley albino rats from small (1 pellet) to large (6 pellets) reward after 0, 24, 48, or 72 trials. A 20-sec delay of reward was used…”
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LANGUAGE, SIGNS, AND COGNITION IN THE CHIMPANZEE by Fouts, Roger S., Mellgren, Roger L.

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Distinction Between Places and Paths in Rats' Spatial Representations by Brown, Steven W, Mellgren, Roger L

“…Rats were trained on a 3-dimensional, 4-arm radial maze. In Experiment 1, Ss trained to climb to the single goal platform chose fewer novel routes to the goal…”
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Partial delay extinction effects within-subjects based on sequential manipulations by Dyck, Dennis G, Mellgren, Roger L

“…Describes an experiment with 4 groups of 10 male albino Sprague-Dawley rats. 3 groups received partial delay of reward in 1 runway and immediate reward in a…”
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Successive nonreinforcements (N-length) and resistance to extinction at spaced trials by Jobe, Jared B, Mellgren, Roger L

“…Investigated the effects of number of nonreinforced trials prior to reinforcement (N-length) at spaced trials. In Exp I with 32 male Sprague-Dawley albino…”
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Transfer of Persistence of Responding across Motivational and Reward Conditions by Mellgren, Roger L., Hoffman, Daryl, Nation, Jack, Williams, Jerry D., Wrather, Dan M.

“…Rats were trained with a continuous or partial reinforcement schedule under water deprivation-reward conditions or food deprivation-reward conditions; half…”
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Extinction performance as a function of reward-nonreward transitions by Eckert, Ed, Mellgren, Roger L

“…Trained 50 male Sprague-Dawley albino rats under 5 different sequences of partial reward, holding nonreward-reward (N-R) transitions constant. Groups which…”
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Partial reinforcement effect, reverse partial reinforcement effect, and generalized partial reinforcement effect within subjects by Mellgren, Roger L, Dyck, Dennis G

“…Describes 2 experiments in which a total of 44 naive male Sprague-Dawley albino rats were given partial reinforcement in 1 alley and CRF in another alley…”
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Resistance to extinction at spaced trials using the within-subject procedure by Mellgren, Roger L, Seybert, Jeffrey A

“…Hypothesized in Exp I that nonreinforcement to reinforcement (N-R) transition would determine resistance to extinction at a 24-hr intertrial interval (ITI). Ss…”
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Discrimination stimulus preexposure and learning of an operant discrimination in the rat by Mellgren, Roger L, Ost, John W

“…Examined previous findings that free, randomly reinforced preexposure of stimuli results in a decrement in subsequent discrimination learning using the…”
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Punishment of appetitively reinforced instrumental behavior: Factors affecting response persistence by Dyck, Dennis G, Mellgren, Roger L, Nation, Jack R

“…In the 1st of 2 runway investigations, 2 groups of 20 male albino Sprague-Dawley rats received equal amounts of punishment and nonreinforcement during…”
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Runway Performance as a Function of Delayed Reinforcement and Delay-Box Confinement by Wike, Edward L., Mellgren, Roger L., Wike, Sharron S.

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Preshift Reward Magnitude and Positive Contrast in the Rat by Mellgren, Roger L., Seybert, Jeffrey A., Wrather, Dan M., Dyck, Dennis G.

“…Four groups of rats were given 24 trials of training in a straight runway with 1, 2, 4, or 8 food pellets, and then shifted to 8 pellets. There was a 20-sec…”
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