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Author |
Dreier, S.; van Zweden, J.S.; D'Ettorre, P. |
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Long-term memory of individual identity in ant queens |
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Journal Article |
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Year |
2007 |
Publication |
Biology Letters |
Abbreviated Journal |
Biol Lett |
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Volume |
3 |
Issue |
5 |
Pages |
459-462 |
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Aggression; Animals; Ants/*physiology; Conditioning, Operant; Evolution; Female; *Memory; *Recognition (Psychology); Social Dominance |
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Abstract |
Remembering individual identities is part of our own everyday social life. Surprisingly, this ability has recently been shown in two social insects. While paper wasps recognize each other individually through their facial markings, the ant, Pachycondyla villosa, uses chemical cues. In both species, individual recognition is adaptive since it facilitates the maintenance of stable dominance hierarchies among individuals, and thus reduces the cost of conflict within these small societies. Here, we investigated individual recognition in Pachycondyla ants by quantifying the level of aggression between pairs of familiar or unfamiliar queens over time. We show that unrelated founding queens of P. villosa and Pachycondyla inversa store information on the individual identity of other queens and can retrieve it from memory after 24h of separation. Thus, we have documented for the first time that long-term memory of individual identity is present and functional in ants. This novel finding represents an advance in our understanding of the mechanism determining the evolution of cooperation among unrelated individuals. |
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Institute of Biology, Department of Population Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark. sdreier@bi.ku.dk |
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1744-9561 |
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PMID:17594958 |
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Equine Behaviour @ team @ |
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4649 |
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Shettleworth, S.J.; Krebs, J.R. |
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
How marsh tits find their hoards: the roles of site preference and spatial memory |
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Journal Article |
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Year |
1982 |
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Journal of experimental psychology. Animal behavior processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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8 |
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4 |
Pages |
354-375 |
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Animals; *Appetitive Behavior; Birds; Cues; Discrimination Learning; *Memory; *Mental Recall; *Orientation; *Space Perception |
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Marsh tits (Parus palustris) store single food items in scattered locations and recover them hours or days later. Some properties of the spatial memory involved were analyzed in two laboratory experiments. In the first, marsh tits were offered 97 sites for storing 12 seeds. They recovered a median of 65% of them 2-3 hr later, making only two errors per seed while doing so. Over trials, they used some sites more often than others, but during recovery they were more likely to visit a site of any preference value if they had stored a seed there that day than if they had not. Recovery performance was much worse if the experimenters moved the seeds between storage and recovery. A fixed search strategy that had some of the same average properties as the tits' search behavior also did worse than the real birds. In Experiment 2, any tendency to visit the same sites on successive daily tests in the aviary was placed in opposition to memory for storage sites by allowing the tits to store more seeds 2 hr after storing a first batch. They tended to avoid individual storage sites holding seeds from the first batch. When the tits searched for all the seeds 2 hr later, they tended to recover more seeds from the second batch than from the first, i.e., there was a recency effect. |
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0097-7403 |
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PMID:7175447 |
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refbase @ user @ |
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385 |
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Author |
Vlasak, A.N. |
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Global and local spatial landmarks: their role during foraging by Columbian ground squirrels (Spermophilus columbianus) |
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Journal Article |
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Year |
2006 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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Volume |
9 |
Issue |
1 |
Pages |
71-80 |
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Animals; Cues; Feeding Behavior/*psychology; Female; *Memory; Mental Recall; Orientation; Sciuridae/*psychology; *Space Perception; *Spatial Behavior |
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Locating food and refuge is essential for an animal's survival. However, little is known how mammals navigate under natural conditions and cope with given environmental constraints. In a series of six experiments, I investigated landmark-based navigation in free-ranging Columbian ground squirrels (Spermophilus columbianus). Squirrels were trained individually to find a baited platform within an array of nine identical platforms and artificial landmarks set up on their territories. After animals learned the location of the food platform in the array, the position of the latter with respect to local artificial, local natural, and global landmarks was manipulated, and the animal's ability to find the food platform was tested. When only positions of local artificial landmarks were changed, squirrels located food with high accuracy. When the location of the array relative to global landmarks was altered, food-finding accuracy decreased but remained significant. In the absence of known global landmarks, the presence of a familiar route and natural local landmarks resulted in significant but not highly accurate performance. Squirrels likely relied on multiple types of cues when orienting towards a food platform. Local landmarks were used only as a secondary mechanism of navigation, and were not attended to when a familiar route and known global landmarks were present. This study provided insights into landmark use by a wild mammal in a natural situation, and it demonstrated that an array of platforms can be employed to investigate landmark-based navigation under such conditions. |
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Biology Department, University of Pennsylvania, Philadelphia, PA 19104, USA. avlasak@sas.upenn.edu |
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1435-9448 |
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PMID:16163480 |
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Equine Behaviour @ team @ |
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2483 |
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Author |
Shettleworth, S.J. |
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Foraging, memory, and constraints on learning |
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Journal Article |
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Year |
1985 |
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Annals of the New York Academy of Sciences |
Abbreviated Journal |
Ann N Y Acad Sci |
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443 |
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216-226 |
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Animals; Animals, Wild; *Appetitive Behavior; *Avoidance Learning; Birds; *Conditioning, Classical; Discrimination Learning; Food Preferences; *Memory; *Mental Recall; Motivation; *Predatory Behavior; Rats; *Taste |
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0077-8923 |
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PMID:3860072 |
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refbase @ user @ |
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384 |
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Author |
Schwartz, B.L.; Evans, S. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Episodic memory in primates |
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Journal Article |
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Year |
2001 |
Publication |
American journal of primatology |
Abbreviated Journal |
Am. J. Primatol. |
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Volume |
55 |
Issue |
2 |
Pages |
71-85 |
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Animals; Behavior, Animal; *Discrimination Learning; Hominidae/*psychology; Humans; *Memory; Self Concept |
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Episodic memory refers to a system of memory with the capacity to recollect specific events from an individual's life. Some psychologists have suggested that episodic memory is a uniquely human phenomenon. We challenge that idea and present evidence that great apes and other primates may possess episodic-like memory. We review criteria developed to assess episodic-like memory in nonhumans, and how they apply to primates. In particular, we discuss the criteria of Clayton et al. [2001], who stated that episodic-like memory is based on the retrieval of multiple and integrated components of an event. We then review eight studies examining memory in great apes and apply the Clayton et al. criteria to each of them. We summarize the evidence that is compatible with the existence of episodic-like memory, although none of the data completely satisfy the Clayton et al. criteria. Morover, feelings of pastness and feelings of confidence, which mark episodic memory in humans, have not been empirically addressed in nonhuman primates. Future studies should be directed at these aspects of memory in primates. We speculate on the functional significance of episodic memory in nonhuman primates. |
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Dept of Psychology, Florida International University, Miami, Florida 33199, USA. SchwartB@fiu.edu |
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0275-2565 |
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PMID:11668526 |
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Equine Behaviour @ team @ |
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4115 |
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Author |
Devenport, J.A.; Patterson, M.R.; Devenport, L.D. |
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Dynamic averaging and foraging decisions in horses (Equus callabus) |
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Journal Article |
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2005 |
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Journal of Comparative psychology |
Abbreviated Journal |
J. Comp. Psychol. |
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119 |
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3 |
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352-358 |
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Animals; *Decision Making; *Feeding Behavior; Female; Horses/*psychology; Male; *Memory, Short-Term; Motivation; Orientation; *Social Environment |
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The variability of most environments taxes foraging decisions by increasing the uncertainty of the information available. One solution to the problem is to use dynamic averaging, as do some granivores and carnivores. Arguably, the same strategy could be useful for grazing herbivores, even though their food renews and is more homogeneously distributed. Horses (Equus callabus) were given choices between variable patches after short or long delays. When patch information was current, horses returned to the patch that was recently best, whereas those without current information matched choices to the long-term average values of the patches. These results demonstrate that a grazing species uses dynamic averaging and indicate that, like granivores and carnivores, they can use temporal weighting to optimize foraging decisions. |
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Department of Psychology, University of Central Oklahoma, 73034, USA. jdevenport@ucok.edu |
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0735-7036 |
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PMID:16131264 |
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no |
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refbase @ user @ |
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752 |
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Author |
Fiset, S.; Beaulieu, C.; Landry, F. |
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Duration of dogs' (Canis familiaris) working memory in search for disappearing objects |
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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 |
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1-10 |
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Animals; Dogs/*psychology; *Exploratory Behavior; Female; Male; *Memory; Visual Perception |
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Two experiments explored the duration of dogs' working memory in an object permanence task: a delay was introduced between the disappearance of a moving object behind a box and the beginning of the search by the animal. In experiment 1, the dogs were tested with retention intervals of 0, 10, 30, and 60 s. Results revealed that the dogs' accuracy declined as a function of the length of the retention interval but remained above chance for each retention interval. In experiment 2, with new subjects, longer retention intervals (0, 30, 60, 120, and 240 s) were presented to the dogs. Results replicated findings from experiment 1 and revealed that the dogs' accuracy remained higher than chance level with delays up to 240 s. In both experiments, the analysis of errors also showed that the dogs searched as a function of the proximity of the target box and were not subject to intertrial proactive interference. In the discussion, we explore different alternatives to explain why dogs' search behaviour for hidden objects decreased as a function of the retention intervals. |
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Secteur Sciences Humaines, Universite de Moncton, Campus d'Edmundston, E3V 2S8, Edmundston, New Brunswick, Canada. sfiset@umce.ca |
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1435-9448 |
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PMID:12658530 |
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Equine Behaviour @ team @ |
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2586 |
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Author |
Fiset, S.; Dore, F.Y. |
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Duration of cats' (Felis catus) working memory for disappearing objects |
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Journal Article |
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2006 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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Volume |
9 |
Issue |
1 |
Pages |
62-70 |
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Animals; Cats/*psychology; *Exploratory Behavior; Female; Male; *Memory; Random Allocation; *Visual Perception |
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This study explored the duration of cats' working memory for hidden objects. Twenty-four cats were equally divided into four groups, which differed according to the type of visual cues displayed on and/or around the hiding boxes. During eight sessions, the four groups of cats were trained to locate a desirable object hidden behind one of the four boxes placed in front of them. Then, the cats were tested with retention intervals of 0, 10, 30 and 60 s. Results revealed no significant differences between the groups during training or testing. In testing, the cats' accuracy to locate the hidden object rapidly declined between 0 and 30 s but remained higher than chance with delays of up to 60 s. The analysis of errors also indicated that the cats searched as a function of the proximity of the target box and were not subjected to intertrial proactive interference. This experiment reveals that the duration of cats' working memory for disappearing objects is limited and the visual cues displayed on and/or around the boxes do not help the cats to memorize a hiding position. In discussion, we explore why the duration of cats' working memory for disappearing objects rapidly declined and compare these finding with those from domestic dogs. The irrelevance of visual cues displayed on and around the hiding boxes on cats' retention capacity is also discussed. |
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Secteur Sciences Humaines, Universite de Moncton, Campus d'Edmundston, Edmundston, New-Brunswick,, Canada, E3V 2S8. sfiset@umce.ca |
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1435-9448 |
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PMID:16133631 |
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Equine Behaviour @ team @ |
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2485 |
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Author |
Bloom, P. |
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Behavior. Can a dog learn a word? |
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Journal Article |
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2004 |
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Science (New York, N.Y.) |
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Science |
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304 |
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5677 |
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1605-1606 |
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Animals; Child; Child, Preschool; *Dogs; Humans; *Learning; *Memory; *Vocabulary |
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Department of Psychology, Yale University, Post Office Box 208205, New Haven, CT 06520-8205, USA. paul.bloom@yale.edu |
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1095-9203 |
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PMID:15192205 |
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28 |
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Neiworth, J.J.; Steinmark, E.; Basile, B.M.; Wonders, R.; Steely, F.; DeHart, C. |
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A test of object permanence in a new-world monkey species, cotton top tamarins (Saguinus oedipus) |
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Journal Article |
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2003 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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6 |
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1 |
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27-37 |
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Animals; Feeding Behavior; Female; Male; *Memory; *Saguinus; *Visual Perception |
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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. |
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Department of Psychology, Carleton College, MN 55057, Northfield, USA. jneiwort@carleton.edu |
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1435-9448 |
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PMID:12658533 |
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Equine Behaviour @ team @ |
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2583 |
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