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	Author	Stoinski, T.S.; Wrate, J.L.; Ure, N.; Whiten, A.
	Title	Imitative learning by captive western lowland gorillas (Gorilla gorilla gorilla) in a simulated food-processing task			Type	Journal Article
	Year	2001	Publication	Journal of comparative psychology (Washington, D.C. : 1983)	Abbreviated Journal	J Comp Psychol
	Volume	115	Issue	3	Pages	272-281
	Keywords	Animals; Behavior, Animal/physiology; Discrimination Learning; Feeding Behavior/physiology; Gorilla gorilla; *Imitative Behavior; Social Behavior
	Abstract	Although field studies have suggested the existence of cultural transmission of foraging techniques in primates, identification of transmission mechanisms has remained elusive. To test experimentally for evidence of imitation in the current study, we exposed gorillas (Gorilla gorilla gorilla) to an artificial fruit foraging task designed by A. Whiten and D. M. Custance (1996). Gorillas (n=6) watched a human model remove a series of 3 defenses around a fruit. Each of the defenses was removed using 1 of 2 alternative techniques. Subsequent video analysis of gorillas' behavior showed a significant tendency to copy the observed technique on 1 of the individual defenses and the direction of removal on another defense. This is the first statistically reliable evidence of imitation in gorillas. Sequence of defense removal was not replicated. The gorillas' responses were most similar to those of chimpanzees.
	Address	TECHlab, Zoo Atlanta, Georgia 30315, USA. stoinskit@mindspring.com
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0735-7036	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:11594496			Approved	no
	Call Number	refbase @ user @			Serial	738
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	Author	Pepperberg, I.M.; Brezinsky, M.V.
	Title	Acquisition of a relative class concept by an African gray parrot (Psittacus erithacus): discriminations based on relative size			Type	Journal Article
	Year	1991	Publication	Journal of Comparative Psychology	Abbreviated Journal	J Comp Psychol
	Volume	105	Issue	3	Pages	286-294
	Keywords	Animals; Aptitude; Concept Formation; Discrimination Learning; Form Perception; Male; Mental Recall; Parrots; Size Perception; Vocalization, Animal
	Abstract	We report that an African gray parrot (Psittacus erithacus), Alex, responds to stimuli on a relative basis. Previous laboratory studies with artificial stimuli (such as pure tones) suggest that birds make relational responses as a secondary strategy, only after they have acquired information about the absolute values of the stimuli. Alex, however, after learning to respond to a small set of exemplars on the basis of relative size, transferred this behavior to novel situations that did not provide specific information about the absolute values of the stimuli. He responded to vocal questions about which was the larger or smaller exemplar by vocally labeling its color or material, and he responded “none” if the exemplars did not differ in size. His overall accuracy was 78.7%.
	Address	Northwestern University
	Corporate Author				Thesis
	Publisher		Place of Publication	Washington, D.C. : 1983	Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0735-7036	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:1935007			Approved	yes
	Call Number	Equine Behaviour @ team @			Serial	3610
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	Author	Zentall, T.R.; Galizio, M.; Critchfied, T.S.
	Title	Categorization, concept learning, and behavior analysis: an introduction			Type	Journal Article
	Year	2002	Publication	Journal of the experimental analysis of behavior	Abbreviated Journal	J Exp Anal Behav
	Volume	78	Issue	3	Pages	237-248
	Keywords	Animals; Association Learning; Concept Formation; Discrimination Learning; Humans; Language
	Abstract	Categorization and concept learning encompass some of the most important aspects of behavior, but historically they have not been central topics in the experimental analysis of behavior. To introduce this special issue of the Journal of the Experimental Analysis of Behavior (JEAB), we define key terms; distinguish between the study of concepts and the study of concept learning; describe three types of concept learning characterized by the stimulus classes they yield; and briefly identify several other themes (e.g., quantitative modeling and ties to language) that appear in the literature. As the special issue demonstrates, a surprising amount and diversity of work is being conducted that either represents a behavior-analytic perspective or can inform or constructively challenge this perspective.
	Address	Department of Psychology, University of Kentucky, Lexington 40506, USA. zentall@pop.uky.edu
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0022-5002	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:12507002			Approved	no
	Call Number	refbase @ user @			Serial	236
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	Author	Zentall, T.R.; Roper, K.L.; Sherburne, L.M.
	Title	Most directed forgetting in pigeons can be attributed to the absence of reinforcement on forget trials during training or to other procedural artifacts			Type	Journal Article
	Year	1995	Publication	Journal of the experimental analysis of behavior	Abbreviated Journal	J Exp Anal Behav
	Volume	63	Issue	2	Pages	127-137
	Keywords	Animals; Attention; Color Perception; Columbidae; Cues; Discrimination Learning; Mental Recall; Motivation; Pattern Recognition, Visual; Reinforcement Schedule; Retention (Psychology)
	Abstract	In research on directed forgetting in pigeons using delayed matching procedures, remember cues, presented in the delay interval between sample and comparisons, have been followed by comparisons (i.e., a memory test), whereas forget cues have been followed by one of a number of different sample-independent events. The source of directed forgetting in delayed matching to sample in pigeons was examined in a 2 x 2 design by independently manipulating whether or not forget-cue trials in training ended with reinforcement and whether or not forget-cue trials in training included a simultaneous discrimination (involving stimuli other than those used in the matching task). Results were consistent with the hypothesis that reinforced responding following forget cues is sufficient to eliminate performance deficits on forget-cue probe trials. Only when reinforcement was omitted on forget-cue trials in training (whether a discrimination was required or not) was there a decrement in accuracy on forget-cue probe trials. When reinforcement is present, however, the pattern of responding established during and following a forget cue in training may also play a role in the directed forgetting effect. These findings support the view that much of the evidence for directed forgetting using matching procedures may result from motivational and behavioral artifacts rather than the loss of memory.
	Address	Department of Psychology, University of Kentucky, Lexington 40506
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0022-5002	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:7714447			Approved	no
	Call Number	refbase @ user @			Serial	256
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	Author	Lazareva, O.F.; Smirnova, A.A.; Bagozkaja, M.S.; Zorina, Z.A.; Rayevsky, V.V.; Wasserman, E.A.
	Title	Transitive responding in hooded crows requires linearly ordered stimuli			Type	Journal Article
	Year	2004	Publication	Journal of the experimental analysis of behavior	Abbreviated Journal	J Exp Anal Behav
	Volume	82	Issue	1	Pages	1-19
	Keywords	Animals; Association; Cognition/physiology; Crows; Discrimination (Psychology); Discrimination Learning; Feedback; Reinforcement (Psychology); Visual Perception/physiology
	Abstract	Eight crows were taught to discriminate overlapping pairs of visual stimuli (A+ B-, B+ C-, C+ D-, and D+ E-). For 4 birds, the stimuli were colored cards with a circle of the same color on the reverse side whose diameter decreased from A to E (ordered feedback group). These circles were made available for comparison to potentially help the crows order the stimuli along a physical dimension. For the other 4 birds, the circles corresponding to the colored cards had the same diameter (constant feedback group). In later testing, a novel choice pair (BD) was presented. Reinforcement history involving stimuli B and D was controlled so that the reinforcement/nonreinforcement ratios for the latter would be greater than for the former. If, during the BD test, the crows chose between stimuli according to these reinforcement/nonreinforcement ratios, then they should prefer D; if they chose according to the diameter of the feedback stimuli, then they should prefer B. In the ordered feedback group, the crows strongly preferred B over D; in the constant feedback group, the crows' choice did not differ significantly from chance. These results, plus simulations using associative models, suggest that the orderability of the postchoice feedback stimuli is important for crows' transitive responding.
	Address	Institute of Higher Nervous Activity, Moscow State University. olga-lazareva@uiowa.edu
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0022-5002	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:15484868			Approved	no
	Call Number	refbase @ user @			Serial	612
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	Author	Biederman, G.B.; Robertson, H.A.; Vanayan, M.
	Title	Observational learning of two visual discriminations by pigeons: a within-subjects design			Type	Journal Article
	Year	1986	Publication	Journal of the experimental analysis of behavior	Abbreviated Journal	J Exp Anal Behav
	Volume	46	Issue	1	Pages	45-49
	Keywords	Animals; Attention; Columbidae; Conditioning, Operant; Cues; Discrimination Learning; Imitative Behavior; Male; Visual Perception
	Abstract	Pigeon's observational learning of successive visual discrimination was studied using within-subject comparisons of data from three experimental conditions. Two pairs of discriminative stimuli were used; each bird was exposed to two of the three experimental conditions, with different pairs of stimuli used in a given bird's two conditions. In one condition, observers were exposed to visual discriminative stimuli only. In a second condition, subjects were exposed to a randomly alternating sequence of two stimuli where the one that would subsequently be used as S+ was paired with the operation of the grain magazine. In a third experimental condition, subjects were exposed to the performance of a conspecific in the operant discrimination procedure. After exposures to conspecific performances, there was facilitation of discriminative learning, relative to that which followed exposures to stimulus and reinforcement sequences or exposures to stimulus sequences alone. Exposure to stimulus and food-delivery sequences enhanced performance relative to exposure to stimulus sequences alone. The differential effects of these three types of exposure were not attributable to order effects or to task difficulty; rather, they clearly were due to the type of exposure.
	Address
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0022-5002	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:3746187			Approved	no
	Call Number	refbase @ user @			Serial	853
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	Author	Dougherty, D.M.; Lewis, P.
	Title	Stimulus generalization, discrimination learning, and peak shift in horses			Type	Journal Article
	Year	1991	Publication	Journal of the experimental analysis of behavior	Abbreviated Journal	J Exp Anal Behav
	Volume	56	Issue	1	Pages	97-104
	Keywords	Animals; Appetitive Behavior; Attention; Conditioning, Operant; Discrimination Learning; Female; Generalization, Stimulus; Horses/psychology; Male; Pattern Recognition, Visual; Size Perception
	Abstract	Using horses, we investigated three aspects of the stimulus control of lever-pressing behavior: stimulus generalization, discrimination learning, and peak shift. Nine solid black circles, ranging in size from 0.5 in. to 4.5 in. (1.3 cm to 11.4 cm) served as stimuli. Each horse was shaped, using successive approximations, to press a rat lever with its lip in the presence of a positive stimulus, the 2.5-in. (6.4-cm) circle. Shaping proceeded quickly and was comparable to that of other laboratory organisms. After responding was maintained on a variable-interval 30-s schedule, stimulus generalization gradients were collected from 2 horses prior to discrimination training. During discrimination training, grain followed lever presses in the presence of a positive stimulus (a 2.5-in circle) and never followed lever presses in the presence of a negative stimulus (a 1.5-in. [3.8-cm] circle). Three horses met a criterion of zero responses to the negative stimulus in fewer than 15 sessions. Horses given stimulus generalization testing prior to discrimination training produced symmetrical gradients; horses given discrimination training prior to generalization testing produced asymmetrical gradients. The peak of these gradients shifted away from the negative stimulus. These results are consistent with discrimination, stimulus generalization, and peak-shift phenomena observed in other organisms.
	Address	Department of Psychology, Ohio University, Athens 45701
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0022-5002	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:1940765			Approved	no
	Call Number				Serial	1764
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	Author	Zentall, T.R.; Klein, E.D.; Singer, R.A.
	Title	Evidence for detection of one duration sample and default responding to other duration samples by pigeons may result from an artifact of retention-test ambiguity			Type	Journal Article
	Year	2004	Publication	Journal of experimental psychology. Animal behavior processes	Abbreviated Journal	J Exp Psychol Anim Behav Process
	Volume	30	Issue	2	Pages	129-134
	Keywords	Animals; Artifacts; Association Learning; Columbidae; Discrimination Learning; Recognition (Psychology); Retention (Psychology); Time Perception; *Transfer (Psychology)
	Abstract	S. C. Gaitan and J. T. Wixted (2000) proposed that when pigeons are trained on a conditional discrimination to associate 1 duration sample with 1 comparison and 2 other duration samples with a 2nd comparison, they detect only the single duration, and on trials involving either of the 2 other duration samples, they respond to the other comparison by default. In 2 experiments, the authors show instead that pigeons lend to treat the retention intervals (such as those used by Gaitan and Wixted) as intertrial intervals, and thus, they tend to treat all trials with a delay as 0-s sample trials. The authors tested this hypothesis by showing that divergent retention functions do not appear when the retention interval is discriminably different from the intertrial interval.
	Address	Department of Psychology, University of Kentucky, Lexington, KY 40506-0044, USA. zentall@uky.edu
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0097-7403	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:15078122			Approved	no
	Call Number	refbase @ user @			Serial	232
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	Author	Zentall, T.R.; Sherburne, L.M.; Roper, K.L.; Kraemer, P.J.
	Title	Value transfer in a simultaneous discrimination appears to result from within-event pavlovian conditioning			Type	Journal Article
	Year	1996	Publication	Journal of experimental psychology. Animal behavior processes	Abbreviated Journal	J Exp Psychol Anim Behav Process
	Volume	22	Issue	1	Pages	68-75
	Keywords	Animals; Behavior, Animal; Columbidae; Conditioning, Classical; Discrimination Learning; Female; Male; *Reinforcement (Psychology)
	Abstract	When pigeons acquire a simple simultaneous discrimination, some of the value acquired by the S+ transfers to the S-. The mechanism underlying this transfer of value was examined in three experiments. In Experiment 1, pigeons trained on two simultaneous discriminations (A + B- and C +/- D-) showed a preference for B over D. This preference was reduced, however, following the devaluation of A. In Experiment 2, when after the same original training, value was given to D, the pigeons' preference for C did not significantly increase. In Experiment 3, when both discriminations involved partial reinforcement (S +/-), A + C- training resulted in a preference for B over D, whereas B + D- training resulted in a preference for A over C. Thus, simultaneous discrimination training appears to result in bidirectional within-event conditioning involving the S+ and S-.
	Address	Department of Psychology, University of Kentucky Lexington 40506, USA
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0097-7403	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:8568497			Approved	no
	Call Number	refbase @ user @			Serial	255
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	Author	Zentall, T.R.; Sherburne, L.M.
	Title	Role of differential sample responding in the differential outcomes effect involving delayed matching by pigeons			Type	Journal Article
	Year	1994	Publication	Journal of experimental psychology. Animal behavior processes	Abbreviated Journal	J Exp Psychol Anim Behav Process
	Volume	20	Issue	4	Pages	390-401
	Keywords	Animals; Behavior, Animal; Choice Behavior; Columbidae; Discrimination Learning; Feeding Behavior; Task Performance and Analysis
	Abstract	The role of differential sample responding in the differential outcomes effect was examined. In Experiment 1, we trained pigeons on a one-to-many matching task with differential sample responding required. Differential outcomes were associated with samples and comparisons, with comparisons only, or with neither samples nor comparisons. Slopes of delay functions for trials with pecked versus nonpecked samples suggested use of a single-code-default strategy in the nondifferential-outcomes group but not in the differential-outcomes groups. In Experiment 2, differential sample responding and differential outcomes were manipulated independently. Again, there were significant differences in the relative slopes of the delay functions. Results suggest that differential outcomes exert their effect independently of differential sample responding.
	Address	Department of Psychology, University of Kentucky, Lexington 40506
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0097-7403	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:7964521			Approved	no
	Call Number	refbase @ user @			Serial	257
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