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Author |
Kelly, D.M.; Spetch, M.L. |
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Title |
Pigeons encode relative geometry |
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Journal Article |
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Year |
2001 |
Publication |
Journal of Experimental Psychology. Animal Behavior Processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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27 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
4 |
Pages |
417-422 |
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Animals; Behavior, Animal/physiology; Cognition/*physiology; Columbidae; Discrimination Learning/physiology; Form Perception/*physiology; Space Perception/*physiology |
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Abstract |
Pigeons were trained to search for hidden food in a rectangular environment designed to eliminate any external cues. Following training, the authors administered unreinforced test trials in which the geometric properties of the apparatus were manipulated. During tests that preserved the relative geometry but altered the absolute geometry of the environment, the pigeons continued to choose the geometrically correct corners, indicating that they encoded the relative geometry of the enclosure. When tested in a square enclosure, which distorted both the absolute and relative geometry, the pigeons randomly chose among the 4 corners, indicating that their choices were not based on cues external to the apparatus. This study provides new insight into how metric properties of an environment are encoded by pigeons. |
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Department of Psychology, University of Alberta, Edmonton, Alberta, Canada, T6G 2E9. kelly@bio.psy.ruhr-uni-bochum.de |
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0097-7403 |
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PMID:11676090 |
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no |
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Equine Behaviour @ team @ |
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2770 |
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Author |
Nakamura, K. |
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Title |
Perseverative errors in object discrimination learning by aged Japanese monkeys (Macaca fuscata) |
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Journal Article |
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Year |
2001 |
Publication |
Journal of Experimental Psychology. Animal Behavior Processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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27 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
4 |
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345-353 |
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Age Factors; Animals; Behavior, Animal/physiology; Cognition Disorders/*diagnosis/*physiopathology; Discrimination Learning/*physiology; Frontal Lobe/*physiopathology; Macaca; Neuropsychological Tests |
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To examine the nature of age-dependent cognitive decline, performance in terms of concurrent object discriminations was assessed in aged and nonaged Japanese monkeys (Macaca fuscata). Aged monkeys required more sessions and committed more errors than nonaged ones in the discriminations, even in simple object discriminations. Analyses of errors suggest that aged monkeys repeated the same errors and committed more errors when they chose a negative object at the 1st trial. A hypothesis analysis of behavior suggests that their incorrect choices were mainly due to object preference. Therefore, the impairment was probably caused by a failure to inhibit inappropriate responses. Together with previous neuropsychological findings, deficits of aged monkeys in the performance of object discriminations can be explained by dysfunction of the frontal cortex. |
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Department of Behavioral and Brain Sciences, Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan. knakamur@pri.kyoto-u.ac.jp |
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0097-7403 |
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PMID:11676085 |
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no |
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Equine Behaviour @ team @ |
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2771 |
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Fagot, J.; Wasserman, E.A.; Young, M.E. |
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Title |
Discriminating the relation between relations: the role of entropy in abstract conceptualization by baboons (Papio papio) and humans (Homo sapiens) |
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Journal Article |
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Year |
2001 |
Publication |
Journal of Experimental Psychology. Animal Behavior Processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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27 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
4 |
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316-328 |
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Animals; Behavior, Animal; Choice Behavior; Cognition/physiology; *Discrimination (Psychology); Discrimination Learning; *Entropy; Female; Humans; Judgment/*physiology; Male; Papio |
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Two baboons (Papio papio) successfully learned relational matching-to-sample: They picked the choice display that involved the same relation among 16 pictures (same or different) as the sample display, although the sample display shared no pictures with the choice displays. The baboons generalized relational matching behavior to sample displays created from novel pictures. Further experiments varying the number of sample pictures and the mixture of same and different sample pictures suggested that entropy plays a key role in the baboons' conceptual behavior. Two humans (Homo sapiens) were similarly trained and tested; their behavior was both similar to and different from the baboons' behavior. The results suggest that animals other than humans and chimpanzees can discriminate the relation between relations. They further suggest that entropy detection may underlie same-different conceptualization, but that additional processes may participate in human conceptualization. |
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Comparative Cognition Research Group, Center for Research in Cognitive Neurosciences, 31 Chemin Joseph Aiguier, 13402 Marseille, France. fagot@lnf.cnrs-mrs.fr |
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0097-7403 |
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PMID:11676083 |
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no |
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Equine Behaviour @ team @ |
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2772 |
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Author |
Johnson, C.M. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Distributed primate cognition: a review |
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Journal Article |
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Year |
2001 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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3 |
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4 |
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167-183 |
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A model of “distributed cognition” is contrasted with the “mental representation” model exemplified by Tomasello and Call's Primate Cognition. Rather than using behavior as a basis for inferences to invisible mental events such as intentions, the distributed approach treats communicative interactions as, themselves, directly observable cognitive events. Similar to a Vygotskian approach, this model characterizes cognition as “co-constructed” by the participants. This approach is thus particularly suitable for studying primates (including humans), whose reliance on multiparty negotiations can undermine the researcher's ability to extrapolate from observable outcomes back to individual intentions. Detailed (e.g., frame-by-frame) analyses of such interactions reveal cross-species differences in the relevant media of information flow (e.g., behavioral coordination, relative gaze) as well as in the flexibility and complexity of the trajectories observed. Plus, with its focus on dynamics, the distributed approach is especially useful for modeling developmental and evolutionary processes. In discussing enculturation and the ontogeny of imitation, its emphasis is on changes in how expert and novice participate in such events, rather than how either may represent them. Primate cognitive evolution is seen as involving changes in context sensitivity, multi-tasking, and the coordination of social attention. Humans in particular – in, especially, the context of teaching – are seen as having specialized in linking co-perception with the refined sensory-motor coordination that enables them to translate observed behavior into strategically similar action. Highlighting the continuity between human and nonhuman development, this promising, complementary model enables us to tap the richness of micro-ethology as a cognitive science. |
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Equine Behaviour @ team @ |
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3086 |
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Author |
Weiss, D.J.; Kralik, J.D.; Hauser, M.D. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Face processing in cotton-top tamarins (Saguinus oedipus) |
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Journal Article |
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Year |
2001 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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3 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
4 |
Pages |
191-205 |
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Current research on face processing in primates has focused on a few species, mostly macaques and chimpanzees; to date, only one New World monkey, the squirrel monkey, has been tested. We explored face processing, and the inversion effect in particular, in a New World primate species, the cotton-top tamarin (Saguinus oedipus). In phase 1 of our study, we trained subjects to discriminate between two faces and two scrambled faces; we then presented the tamarins with a series of novel probes in order to determine the features underlying classification. Results showed that the tamarins relied on the external contour of the face for discrimination more than the internal features and their configuration. Statistical analyses revealed no differences in accuracy or response times to upright versus inverted stimuli, and thus no inversion effect. In phase 2, we provided subjects with additional training on the face versus scrambled face discrimination task in order to focus their attention on the configuration of the internal features. Accuracy data revealed individual differences in how tamarins classified these stimuli, even though each subject was trained in the same way. In phase 3, we tested for generalization to a new set of face stimuli, as well as for the capacity to show an inversion effect. For one subject who attended to the configuration of internal features, we found significant evidence of generalization, but no evidence for an inversion effect. |
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no |
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Equine Behaviour @ team @ |
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3183 |
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Author |
Call, J.; Carpenter, M. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Do apes and children know what they have seen? |
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Journal Article |
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Year |
2001 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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3 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
4 |
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207-220 |
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Chimpanzees and young children understand much about what other individuals have and have not seen. This study investigates what they understand about their own visual perception. Chimpanzees, orangutans, and 2.5-year-old children were presented with a finding game in which food or stickers were hidden in one of two or three tubes. We varied whether subjects saw the baiting of the tubes, whether subjects could see through the tubes, and whether there was a delay between baiting and presentation of the tubes to subjects. We measured not only whether subjects chose the correct tube but also, more importantly, whether they spontaneously looked into one or more of the tubes before choosing one. Most apes and children appropriately looked into the tubes before choosing one more often when they had not seen the baiting than when they had seen the baiting. In general, they used efficient search strategies more often than insufficient or excessive ones. Implications of subjects' search patterns for their understanding of seeing and knowing in the self are discussed. |
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no |
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Equine Behaviour @ team @ |
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3321 |
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Author |
Nakajima, S. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Failure of hierarchical conditional rule learning in the pigeon (Columba livia) |
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Journal Article |
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2001 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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3 |
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4 |
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221-226 |
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Pigeons were trained with a conditional discrimination task in three-key operant chambers. Choosing either the left or right key was followed by food according to combinations of three preceding events: (a) a houselight illumination condition (dark or light), (b) presence or absence of green flashes on the three keys, (c) a color (amber or blue) of the center sample key. With these 2ǶǶ event combinations, eight types of correct trials were prepared: (1) darkMno flashMamberMLEFT, (2) darkMno flashMblueMRIGHT, (3) darkMflashMamberMRIGHT, (4) darkMflashMblueMLEFT, (5) lightMno flashMamberMRIGHT, (6) lightMno flashMblueMLEFT, (7) lightMflashMamberMLEFT, and (8) lightMflashMblueMRIGHT. Seven of these eight types were used for training of a given bird, and then the remaining trial type was presented as the test. If the birds had learned the conditional structure of the events (the hierarchical switching rule), they would have responded correctly to the test type. However, they chose the opposite side key, suggesting that they had learned cue configuration or multiple rules to solve the task. |
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Equine Behaviour @ team @ |
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3341 |
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Meershoek, L.S.; Roepstorff, L.; Schamhardt, H.C.; Johnston, C.; Bobbert, M.F. |
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Title |
Joint moments in the distal forelimbs of jumping horses during landing |
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Journal Article |
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2001 |
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Equine Veterinary Journal |
Abbreviated Journal |
Equine Vet J |
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33 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
4 |
Pages |
410-415 |
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Animals; Biomechanics; Forelimb/physiology; Gait/*physiology; Horses/*physiology; Joints/*physiology; Physical Conditioning, Animal; Tendons/*physiology; Weight-Bearing |
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Tendon injuries are an important problem in athletic horses and are probably caused by excessive loading of the tendons during demanding activities. As a first step towards understanding these injuries, the tendon loading was quantified during jump landings. Kinematics and ground reaction forces were collected from the leading and trailing forelimbs of 6 experienced jumping horses. Joint moments were calculated using inverse dynamic analysis. It was found that the variation of movement and loading patterns was small, both within and between horses. The peak flexor joint moments in the coffin and fetlock joints were larger in the trailing limb (-0.62 and -2.44 Nm/kg bwt, respectively) than in the leading limb (-0.44 and -1.93 Nm/kg bwt, respectively) and exceeded literature values for trot by 82 and 45%. Additionally, there was an extensor coffin joint moment in the first half of the stance phase of the leading limb (peak value 0.26+/-0.18 Nm/kg bwt). From these results, it was concluded that the loading of the flexor tendons during landing was higher in the trailing than in the leading limb and that there was an unexpected loading of the extensor tendon in the leading limb. |
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Department of Veterinary Anatomy and Physiology, Faculty of Veterinary Medicine, Utrecht University, The Netherlands |
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0425-1644 |
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PMID:11469776 |
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Equine Behaviour @ team @ |
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3787 |
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Kudo, H.; Dunbar, R.I.M. |
![goto web page (via DOI) doi](img/doi.gif)
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Neocortex size and social network size in primates |
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Journal Article |
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2001 |
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Animal Behaviour. |
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Anim. Behav. |
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62 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
4 |
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711-722 |
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Primates use social grooming to service coalitions and it has been suggested that these directly affect the fitness of their members by allowing them to reduce the intrinsic costs associated with living in large groups. We tested two hypotheses about the size of grooming cliques that derive from this suggestion: (1) that grooming clique size should correlate with relative neocortex size and (2) that the size of grooming cliques should be proportional to the size of the groups they have to support. Both predictions were confirmed, although we show that, in respect of neocortex size, there are as many as four statistically distinct grades within the primates (including humans). Analysis of the patterns of grooming among males and females suggested that large primate social groups often consist of a set of smaller female subgroups (in some cases, matrilinearly based coalitions) that are linked by individual males. This may be because males insert themselves into the interstices between weakly bonded female subgroups rather than because they actually hold these subunits together. |
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0003-3472 |
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Equine Behaviour @ team @ |
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4726 |
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Author |
Hostetter, A.B.; Cantero, M.; Hopkins, W.D. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Differential use of vocal and gestural communication by chimpanzees (Pan troglodytes) in response to the attentional status of a human (Homo sapiens) |
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2001 |
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Journal of Comparative Psychology |
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J. Comp. Psychol. |
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115 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
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337-343 |
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Animals; *Attention; *Communication Methods, Total; Female; *Gestures; Humans; Male; Motivation; Pan troglodytes/*psychology; Social Environment; Species Specificity; *Vocalization, Animal |
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This study examined the communicative behavior of 49 captive chimpanzees (Pan troglodytes), particularly their use of vocalizations, manual gestures, and other auditory- or tactile-based behaviors as a means of gaining an inattentive audience's attention. A human (Homo sapiens) experimenter held a banana while oriented either toward or away from the chimpanzee. The chimpanzees' behavior was recorded for 60 s. Chimpanzees emitted vocalizations faster and were more likely to produce vocalizations as their 1st communicative behavior when a human was oriented away from them. Chimpanzees used manual gestures more frequently and faster when the human was oriented toward them. These results replicate the findings of earlier studies on chimpanzee gestural communication and provide new information about the intentional and functional use of their vocalizations. |
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Department of Psychology, Berry College, USA |
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0735-7036 |
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PMID:11824896 |
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yes |
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Equine Behaviour @ team @ |
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4970 |
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