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Author |
Weatherly, J.N.; Arthur, E.I.L.; Tischart, L.M. |
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Title |
Altering “motivational” variables alters induction produced by upcoming food-pellet reinforcement |
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Journal Article |
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Year |
2003 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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6 |
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1 |
Pages |
17-26 |
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Animals; *Conditioning, Operant; Food Deprivation; Male; *Motivation; Rats; Rats, Sprague-Dawley |
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Abstract |
Previous research has demonstrated that rats will increase their rates of lever pressing for sucrose rewards in the first half of an experimental session when food pellets, rather than the same sucrose, continually serve as the reward in the second half of the session. This effect has been coined induction, and the present study investigated whether it could be altered by altering “motivational” variables. Experiment 1 manipulated subjects' motivation by altering, across conditions, their level of food deprivation. Predictably, the size of induction varied directly with level of deprivation. Experiments 2 and 3 manipulated subjects' motivation by feeding them food pellets and sucrose, respectively, prior to their responding in the experimental session. These pre-session feedings decreased the size of the observed induction in both experiments. The results from the present study indicate that the size of induction is correlated with subjects' motivation to respond for the available reinforcers. They are also consistent with the idea that operant processes underlie the effect. The notion that induction might encompass the concept of “anticipation” is also discussed. |
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Department of Psychology, University of North Dakota, ND 58202-8380, Grand Forks, USA. jeffrey_weatherly@und.nodak.edu |
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1435-9448 |
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PMID:12658532 |
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no |
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Equine Behaviour @ team @ |
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2584 |
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Author |
Katz, M.; Lachlan, R.F. |
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Title |
Social learning of food types in zebra finches (Taenopygia guttata) is directed by demonstrator sex and feeding activity |
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Journal Article |
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Year |
2003 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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6 |
Issue |
1 |
Pages |
11-16 |
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Animals; Color; Diet; *Feeding Behavior; Female; *Learning; Male; Sex Factors; *Social Behavior; *Songbirds |
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In this study we examined how social learning of feeding preferences by zebra finches was affected by the identity of different demonstrators. We presented adult zebra finches with two demonstrators, one male and one female, that exhibited different food choices, and we recorded their subsequent preference when given a choice between the two food types. Previously it was found that young zebra finches' patterns of social learning are affected by the sex of the individual demonstrating a feeding behaviour. This result could be explained by the lack of exposure these animals had to the opposite sex, or by their mating status. Therefore, we investigated the social learning preferences of adult mated zebra finches. We found the same pattern of directed social learning of a different type of feeding behaviour (food colour): female zebra finches preferred the colour of food eaten by male demonstrators, whereas male zebra finches showed little evidence of any preference for the colour of food eaten by female demonstrators. Furthermore, we found that female observers' preferences were biased by demonstrators' relative feeding activity: the female demonstrator was only ever preferred if it ate less than its male counterpart. |
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Institute of Evolutionary and Ecological Science, University of Leiden, Kaiserstraat 63, 2311GP, Leiden, The Netherlands |
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1435-9448 |
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PMID:12658531 |
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Equine Behaviour @ team @ |
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2585 |
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Author |
Baron-Cohen S; Leslie AM; Frith U |
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Does the autistic child have a “theory of mind”? |
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1985 |
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Cognition |
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21 |
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37 |
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Equine Behaviour @ team @ |
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2979 |
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Wimmer H; Perner J |
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Title |
Beliefs about beliefs: representation and constraining function of wrong beliefs in young children's understanding of deception |
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1983 |
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Cognition |
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13 |
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103 |
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Equine Behaviour @ team @ |
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3051 |
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Hauser MD |
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Title |
Artifactual kinds and functional design features: what a primate understands without language |
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1997 |
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Cognition |
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64 |
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285 |
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Equine Behaviour @ team @ |
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3064 |
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Author |
Premack D; Premack AJ |
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Title |
Levels of causal understanding in chimpanzees and children |
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1994 |
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Cognition |
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50 |
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347 |
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Equine Behaviour @ team @ |
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3072 |
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Santos LR; Hauser MD; Spelke ES |
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Recognition and categorization of biologically significant objects by rhesus monkeys (Macaca mulatta): the domain of food |
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2001 |
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Cognition |
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82 |
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127 |
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Equine Behaviour @ team @ |
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3073 |
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Cook, R.G.; Shaw, R.; Blaisdell, A.P. |
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Title |
Dynamic object perception by pigeons: discrimination of action in video presentations |
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Journal Article |
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Year |
2001 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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Volume |
4 |
Issue |
3 |
Pages |
137-146 |
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Two experiments examined the discrimination by pigeons of relative motion using computer-generated video stimuli. Using a go/no-go procedure, pigeons were tested with video stimuli in which the camera's perspective went either “around” or “through” an approaching object in a semi-realistic context. Experiment 1 found that pigeons could learn this discrimination and transfer it to videos composed from novel objects. Experiment 2 found that the order of the video's frames was critical to the discrimination of the videos. We hypothesize that the pigeons perceived a three-dimensional representation of the objects and the camera's relative motion and used this as the primary basis for discrimination. It is proposed that the pigeons might be able to form generalized natural categories for the different kinds of motions portrayed in the videos. |
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Equine Behaviour @ team @ |
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3142 |
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Author |
Forkman, B. |
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Title |
Domestic hens have declarative representations |
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Journal Article |
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2000 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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3 |
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3 |
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135-137 |
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It is generally considered that information can be stored either as a procedural or as a declarative representation. A devaluation technique was used to determine whether hens have declarative representations. Individual hens (Gallus gallus domesticus) were fed in an enclosure with two containers, each with a new food type. One of the food types was devalued by pre-feeding with that food, after which the hens were tested with empty food containers. The pre-feeding should only affect the choice of the hens if they have learned where a particular food type was (declarative representation) rather than “go left when coming into the enclosure” (procedural representation). A significant proportion of the hens went to the location previously occupied by the non-devalued food (seven out of eight). This supports the hypothesis that domestic hens can form declarative representations. |
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Equine Behaviour @ team @ |
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3143 |
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Author |
De Lillo,; C. De Lillo; Floreano,; D. Floreano; Antinucci,; F. Antinucci |
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Title |
Transitive choices by a simple, fully connected, backpropagation neural network: implications for the comparative study of transitive inference |
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Journal Article |
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2001 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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4 |
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1 |
Pages |
61-68 |
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In search of the minimal requirements for transitive reasoning, a simple neural network was trained and tested on the non-verbal version of the conventional “five-term-series task” – a paradigm used with human adults, children and a variety of non-human species. The transitive performance of the network was analogous in several aspects to that reported for children and animals. The three effects usually associated with transitive choices i.e. “symbolic distance”, “lexical marking” and “end-anchor”, were also clearly shown by the neural network. In a second experiment, where the training conditions were manipulated, the network failed to match the behavioural pattern reported for human adults in the test following an ordered presentation of the premises. However, it mimicked young children's performance when tested with a novel comparison term. Although we do not intend to suggest a new model of transitive inference, we conclude, in line with other authors, that a simple error-correcting rule can generate transitive behaviour similar to the choice pattern of children and animals in the binary form of the five-term-series task without requiring high-order logical or paralogical abilities. The analysis of the training history and of the final internal structure of the network reveals the associative strategy employed. However, our results indicate that the scope of the associative strategy used by the network might be limited. The extent to which the conventional five-term-series task, in absence of appropriate manipulations of training and testing conditions, is suitable to detect cognitive differences across species is also discussed on the basis of our results. |
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Equine Behaviour @ team @ |
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3145 |
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