Records |
Author |
Merchant, H.; Fortes, A.F.; Georgopoulos, A.P. |
Title |
Short-term memory effects on the representation of two-dimensional space in the rhesus monkey |
Type |
Journal Article |
Year |
2004 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
Volume |
7 |
Issue |
3 |
Pages |
133-143 |
Keywords |
Analysis of Variance; Animals; Discrimination Learning/*physiology; Macaca mulatta; Male; Memory, Short-Term/*physiology; Mental Processes/*physiology; Pattern Recognition, Visual/*physiology; Space Perception/*physiology |
Abstract |
Human subjects represent the location of a point in 2D space using two independent dimensions (x-y in Euclidean or radius-angle in polar space), and encode location in memory along these dimensions using two levels of representation: a fine-grain value and a category. Here we determined whether monkeys possessed the ability to represent location with these two levels of coding. A rhesus monkey was trained to reproduce the location of a dot in a circle by pointing, after a delay period, on the location where a dot was presented. Five different delay periods (0.5-5 s) were used. The results showed that the monkey used a polar coordinate system to represent the fine-grain spatial coding, where the radius and angle of the dots were encoded independently. The variability of the spatial response and reaction time increased with longer delays. Furthermore, the animal was able to form a categorical representation of space that was delay-dependent. The responses avoided the circumference and the center of the circle, defining a categorical radial prototype around one third of the total radial length. This radial category was observed only at delay durations of 3-5 s. Finally, the monkey also formed angular categories with prototypes at the obliques of the quadrants of the circle, avoiding the horizontal and vertical axes. However, these prototypes were only observed at the 5-s delay and on dots lying on the circumference. These results indicate that monkeys may possess spatial cognitive abilities similar to humans. |
Address |
Brain Sciences Center (11B), Veterans Affairs Medical Center, One Veterans Drive, MN 55417, Minneapolis, USA |
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ISSN |
1435-9448 |
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Notes |
PMID:14669074 |
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no |
Call Number |
Equine Behaviour @ team @ |
Serial |
2548 |
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Author |
Neiworth, J.J.; Steinmark, E.; Basile, B.M.; Wonders, R.; Steely, F.; DeHart, C. |
Title |
A test of object permanence in a new-world monkey species, cotton top tamarins (Saguinus oedipus) |
Type |
Journal Article |
Year |
2003 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
Volume |
6 |
Issue |
1 |
Pages |
27-37 |
Keywords |
Animals; Feeding Behavior; Female; Male; *Memory; *Saguinus; *Visual Perception |
Abstract |
Cotton top tamarins were tested in visible and invisible displacement tasks in a method similar to that used elsewhere to test squirrel monkeys and orangutans. All subjects performed at levels significantly above chance on visible ( n=8) and invisible ( n=7) displacements, wherein the tasks included tests of the perseverance error, tests of memory in double and triple displacements, and “catch” trials that tested for the use of the experimenter's hand as a cue for the correct cup. Performance on all nine tasks was significantly higher than chance level selection of cups, and tasks using visible displacements generated more accurate performance than tasks using invisible displacements. Performance was not accounted for by a practice effect based on exposure to successive tasks. Results suggest that tamarins possess stage 6 object permanence capabilities, and that in a situation involving brief exposure to tasks and foraging opportunities, tracking objects' movements and responding more flexibly are abilities expressed readily by the tamarins. |
Address |
Department of Psychology, Carleton College, MN 55057, Northfield, USA. jneiwort@carleton.edu |
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1435-9448 |
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Notes |
PMID:12658533 |
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no |
Call Number |
Equine Behaviour @ team @ |
Serial |
2583 |
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Author |
Fetterman, J.G. |
Title |
Dimensions of stimulus complexity |
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 |
3-18 |
Keywords |
Animals; *Behavior, Animal; Cognition; *Learning; Memory; Time Factors |
Abstract |
Animal learning research has increasingly used complex stimuli that approximate natural objects, events, and locations, a trend that has accompanied a resurgence of interest in the role of cognitive factors in learning. Accounts of complex stimulus control have focused mainly on cognitive mechanisms and largely ignored the contribution of stimulus information to perception and memory for complex events. It is argued here that research on animal learning stands to benefit from a more detailed consideration of the stimulus and that James Gibson's stimulus-centered theory of perception serves as a useful framework for analyses of complex stimuli. Several issues in the field of animal learning and cognition are considered from the Gibsonian perspective on stimuli, including the fundamental problem of defining the effective stimulus. |
Address |
Department of Psychology, Indiana University-Purdue University, Indianapolis 46202, USA |
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English |
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ISSN |
0097-7403 |
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Notes |
PMID:8568494 |
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no |
Call Number |
Equine Behaviour @ team @ |
Serial |
2782 |
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Author |
Pickens, C.L.; Holland, P.C. |
Title |
Conditioning and cognition |
Type |
Journal Article |
Year |
2004 |
Publication |
Neuroscience and Biobehavioral Reviews |
Abbreviated Journal |
Neurosci Biobehav Rev |
Volume |
28 |
Issue |
7 |
Pages |
651-661 |
Keywords |
Animals; Association Learning/physiology; Cognition/*physiology; Conditioning (Psychology)/*physiology; Discrimination Learning/physiology; Humans; Memory; Models, Psychological; Reinforcement (Psychology); Visual Perception/physiology |
Abstract |
Animals' abilities to use internal representations of absent objects to guide adaptive behavior and acquire new information, and to represent multiple spatial, temporal, and object properties of complex events and event sequences, may underlie many aspects of human perception, memory, and symbolic thought. In this review, two classes of simple associative learning tasks that address these core cognitive capacities are discussed. The first set, including reinforcer revaluation and mediated learning procedures, address the power of Pavlovian conditioned stimuli to gain access, through learning, to representations of upcoming events. The second set of investigations concern the construction of complex stimulus representations, as illustrated in studies of contextual learning, the conjunction of explicit stimulus elements in configural learning procedures, and recent studies of episodic-like memory. The importance of identifying both cognitive process and brain system bases of performance in animal models is emphasized. |
Address |
Department of Psychological and Brain Sciences, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA |
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English |
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Edition |
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ISSN |
0149-7634 |
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Notes |
PMID:15555675 |
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no |
Call Number |
Equine Behaviour @ team @ |
Serial |
2803 |
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Author |
Healy, S.D.; Braham, S.R.; Braithwaite, V.A. |
Title |
Spatial working memory in rats: no differences between the sexes |
Type |
Journal Article |
Year |
1999 |
Publication |
Proceedings. Biological Sciences / The Royal Society |
Abbreviated Journal |
Proc Biol Sci |
Volume |
266 |
Issue |
1435 |
Pages |
2303-2308 |
Keywords |
Animals; Estrus/metabolism; Female; Male; Memory/*physiology; Rats; Sex Factors; Swimming |
Abstract |
In a number of mammalian species, males appear to have superior spatial abilities to females. The favoured explanations for this cognitive difference are hormonal, with higher testosterone levels in males than females leading to better spatial performance, and evolutionary, where sexual selection has favoured males with increased spatial abilities for either better navigational skills in hunting or to enable an increased territory size. However, an alternative explanation for this sex difference focuses on the role of varying levels of oestrogen in females in spatial cognition (the 'fertility and parental care' hypothesis). One possibility is that varying oestrogen levels result in variation in spatial learning and memory so that, when tested across the oestrous cycle, females perform as well as males on days of low oestrogen but more poorly on days of high oestrogen. If day in the oestrous cycle is not taken into account then, across an experiment, any sex differences found would always produce male superiority. We used a spatial working memory task in a Morris water maze to test the spatial learning and memory abilities of male and female rats. The rats were tested across a number of consecutive days during which the females went through four oestrous cycles. We found no overall sex differences in latencies to reach a submerged platform in a Morris water maze but, on the day of oestrus (low oestrogen), females took an extra swim to learn the platform's location (a 100% increase over the other days in the cycle). Female swim speed also varied across the oestrous cycle but females were no less active on the day of oestrus. These results oppose the predictions of the fertility and parental care hypothesis. |
Address |
Department of Psychology, University of Newcastle, UK. s.healey@ed.ac.uk |
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Edition |
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ISSN |
0962-8452 |
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Notes |
PMID:10629980 |
Approved |
no |
Call Number |
Equine Behaviour @ team @ |
Serial |
2818 |
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Author |
Griffin, D.R. |
Title |
Animals know more than we used to think |
Type |
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Year |
2001 |
Publication |
Proceedings of the National Academy of Sciences of the United States of America |
Abbreviated Journal |
Proc. Natl. Acad. Sci. U.S.A. |
Volume |
98 |
Issue |
9 |
Pages |
4833-4834 |
Keywords |
Animal Communication; Animals; Attention/physiology; Brain/physiology; Choice Behavior/physiology; Cognition/*physiology; Humans; Macaca mulatta/physiology/*psychology; Memory/*physiology; Optic Disk/physiology; Psychological Tests |
Abstract |
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English |
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Series Editor |
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Edition |
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ISSN |
0027-8424 |
ISBN |
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Notes |
PMID:11320232 |
Approved |
no |
Call Number |
Equine Behaviour @ team @ |
Serial |
2823 |
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Author |
Hampton, R.R. |
Title |
Rhesus monkeys know when they remember |
Type |
Journal Article |
Year |
2001 |
Publication |
Proceedings of the National Academy of Sciences of the United States of America |
Abbreviated Journal |
Proc. Natl. Acad. Sci. U.S.A. |
Volume |
98 |
Issue |
9 |
Pages |
5359-5362 |
Keywords |
Animals; Choice Behavior/physiology; Cognition/*physiology; Cues; Food Preferences/psychology; Macaca mulatta/*physiology/*psychology; Male; Memory/*physiology; Probability; Psychological Tests; Reproducibility of Results; Sensitivity and Specificity |
Abstract |
Humans are consciously aware of some memories and can make verbal reports about these memories. Other memories cannot be brought to consciousness, even though they influence behavior. This conspicuous difference in access to memories is central in taxonomies of human memory systems but has been difficult to document in animal studies, suggesting that some forms of memory may be unique to humans. Here I show that rhesus macaque monkeys can report the presence or absence of memory. Although it is probably impossible to document subjective, conscious properties of memory in nonverbal animals, this result objectively demonstrates an important functional parallel with human conscious memory. Animals able to discern the presence and absence of memory should improve accuracy if allowed to decline memory tests when they have forgotten, and should decline tests most frequently when memory is attenuated experimentally. One of two monkeys examined unequivocally met these criteria under all test conditions, whereas the second monkey met them in all but one case. Probe tests were used to rule out “cueing” by a wide variety of environmental and behavioral stimuli, leaving detection of the absence of memory per se as the most likely mechanism underlying the monkeys' abilities to selectively decline memory tests when they had forgotten. |
Address |
Section on the Neurobiology of Learning and Memory, Laboratory of Neuropsychology, National Institute of Mental Health, Building 49, Room 1B-80, Bethesda, MD 20892, USA. robert@ln.nimh.nih.gov |
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0027-8424 |
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Notes |
PMID:11274360 |
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no |
Call Number |
Equine Behaviour @ team @ |
Serial |
2824 |
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Author |
Cohen, J. |
Title |
Animal behavior. The world through a chimp's eyes |
Type |
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Year |
2007 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
Volume |
316 |
Issue |
5821 |
Pages |
44-45 |
Keywords |
Animal Communication; Animals; *Behavior, Animal; Cognition; Cooperative Behavior; Culture; Memory; Pan troglodytes/*psychology; Social Behavior; Tool Use Behavior |
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English |
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Edition |
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ISSN |
1095-9203 |
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Notes |
PMID:17412932 |
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no |
Call Number |
Equine Behaviour @ team @ |
Serial |
2832 |
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Author |
Morell, V. |
Title |
Nicola Clayton profile. Nicky and the jays |
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Year |
2007 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
Volume |
315 |
Issue |
5815 |
Pages |
1074-1075 |
Keywords |
Animals; *Behavior, Animal; *Cognition; England; History, 20th Century; History, 21st Century; Intelligence; Memory; Passeriformes/*physiology; Portraits |
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ISSN |
1095-9203 |
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Notes |
PMID:17322042 |
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no |
Call Number |
Equine Behaviour @ team @ |
Serial |
2833 |
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Author |
Pennisi, E. |
Title |
Animal cognition. Social animals prove their smarts |
Type |
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Year |
2006 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
Volume |
312 |
Issue |
5781 |
Pages |
1734-1738 |
Keywords |
Animals; *Behavior, Animal; *Birds; *Cognition; Comprehension; Cues; Food; Hominidae/*psychology; *Intelligence; Learning; Memory; *Social Behavior |
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ISSN |
1095-9203 |
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Notes |
PMID:16794055 |
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no |
Call Number |
Equine Behaviour @ team @ |
Serial |
2836 |
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