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Huber, R.; van Staaden, M.J.; Kaufman, L.S.; Liem, K.F. |
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Title |
Microhabitat Use, Trophic Patterns, and the Evolution of Brain Structure in African Cichlids |
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Year |
1997 |
Publication |
Brain, Behavior and Evolution |
Abbreviated Journal |
Brain Behav Evol |
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50 |
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3 |
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167-182 |
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The species assemblages of cichlids in the three largest African Great Lakes are among the richest concentrations of vertebrate species on earth. The faunas are broadly similar in terms of trophic diversity, species richness, rates of endemism, and taxonomic composition, yet they are historically independent of each other. Hence, they offer a true and unique evolutionary experiment to test hypotheses concerning the mutual dependencies of ecology and brain morphology. We examined the brains of 189 species of cichlids from the three large lakes: Victoria, Tanganyika, and Malawi. A first paper demonstrated that patterns of evolutionary change in cichlid brain morphology are similar across taxonomic boundaries as well as across the three lakes [van Staaden et al., 1995 ZACS 98: 165–178]. Here we report a close relationship between the relative sizes of various brain structures and variables related to the utilization of habitat and prey. Causality is difficult to assign in this context, nonetheless, prey size and agility, turbidity levels, depth, and substrate complexity are all highly predictive of variation in brain structure. Areas associated with primary sensory functions such as vision and taste relate significantly to differences in feeding habits. Turbidity and depth are closely associated with differences in eye size, and large eyes are associated with species that pick plankton from the water column. Piscivorous taxa and others that utilize motile prey are characterized by a well developed optic tectum and a large cerebellum compared to species that prey on molluscs or plants. Structures relating to taste are well developed in species feeding on benthos over muddy or sandy substrates. The data militated against the existence of compensatory changes in brain structure. Thus enhanced development of a particular function is generally not accompanied by a parallel reduction of structures related to other modalities. Although genetic and environmental influences during ontogeny of the brain cannot be isolated, this study provides a rich source of hypotheses concerning the way the nervous system functions under various environmental conditions and how it has responded to natural selection. |
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0006-8977 |
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Equine Behaviour @ team @ |
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5454 |
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Rogers, L.J. |
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Title |
Early Experiential Effects on Laterality: Research on Chicks has Relevance to Other Species |
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Year |
1997 |
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Laterality |
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Laterality |
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2 |
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3-4 |
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199-219 |
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The influence of early experience on the development of lateralisation of hemispheric function was further investigated, using the chick as a model. A range of functions are lateralised in the chick and these correlate with asymmetry in the organisation of the visual projections. Chicks using the right eye and, therefore, primarily the left hemisphere are able to switch from pecking randomly at grain and pebbles to pecking mainly at grain, whereas those using the left eye and primarily the right hemisphere continue to peck at random. Exposure to light during the last days of incubation establishes this lateralisation in males, as a consequence of the embryo being oriented in the egg so that the left eye only is occluded. Males incubated in the dark peck at random when using either the right or left eye. Irrespective of light experience, females perform the same as darkincubated males: they are not influenced by light exposure. Monocular performance of the pebble-grain task is compared to binocular performance, and the sensitive period for the influence of light is delineated. The interactive effects of sex hormone levels on the differentiation of lateralisation are discussed and also the relevance of the results to other species, including humans. |
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Psychology Press |
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1357-650x |
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doi: 10.1080/713754277 |
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Equine Behaviour @ team @ |
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5587 |
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Russell, C.L.; Bard, K.A.; Adamson, L.B. |
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Title |
Social referencing by young chimpanzees (Pan troglodytes) |
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1997 |
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Journal of Comparative Psychology |
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J. Comp. Psychol. |
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111 |
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2 |
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185-191 |
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happy & fear messages concerning novel objects from familiar human caregiver, social referencing, 14–41 mo old chimpanzees |
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Social referencing is the seeking of information from another individual and the use of that information to evaluate a situation. It is a well-documented ability in human infants but has not been studied experimentally in nonhuman primates. Seventeen young nursery-reared chimpanzees (14 to 41 months old) were observed in a standard social referencing paradigm in which they received happy and fear messages concerning novel objects from a familiar human caregiver. Each chimpanzee looked referentially at their caregiver, and the emotional messages that they received differentially influenced their gaze behavior and avoidance of the novel objects. It is concluded that chimpanzees can acquire information about their complex social and physical environments through social referencing and can use emotional information to alter their own behavior. (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
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US: American Psychological Association |
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1939-2087(Electronic);0735-7036(Print) |
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Equine Behaviour @ team @ 1997-06365-008 |
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5603 |
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Author |
Schultz, W.; Dayan, P.; Montague, P.R. |
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Title |
A Neural Substrate of Prediction and Reward |
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1997 |
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Science |
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275 |
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5306 |
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1593-1599 |
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The capacity to predict future events permits a creature to detect, model, and manipulate the causal structure of its interactions with its environment. Behavioral experiments suggest that learning is driven by changes in the expectations about future salient events such as rewards and punishments. Physiological work has recently complemented these studies by identifying dopaminergic neurons in the primate whose fluctuating output apparently signals changes or errors in the predictions of future salient and rewarding events. Taken together, these findings can be understood through quantitative theories of adaptive optimizing control. |
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Equine Behaviour @ team @ |
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5749 |
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Palme, R.; Moestl, E. |
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Title |
Measurement of cortisol metabolites in faeces of sheep as a parameter of cortisol concentration in blood |
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Year |
1997 |
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Zeitschrift für Säugetierkunde |
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J. Mammal. Biol. |
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62 |
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192-197 |
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glucocorticoids, metabolites, animal biology, sheep, immunoenzyme techniques, |
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Equine Behaviour @ team @ |
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6044 |
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Author |
Kräußlich, H.; Brem, G. |
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Title |
Tierzucht und allgemeine Landwirtschaftslehre für Tiermediziner |
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1997 |
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Enke |
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Stuttgart |
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Equine Behaviour @ team @ |
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6542 |
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Khalil, A.M.; Kaseda, Y. |
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Title |
Behavioral patterns and proximate reason of young male separation in Misaki feral horses |
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1997 |
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Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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54 |
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4 |
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281-289 |
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Misaki feral horse; Horse maternal-filial bond; Social behavior; Separation season; Separation reason |
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The present investigation was undertaken to study the proximate reasons why and the behavioral patterns of young male Misaki feral horses when they left their natal band or mothers. We observed a total of ten young males twice a month from January 1988 to December 1995. Almost all young males left their natal band or mothers at between 1 and 4 years of age. We found that, during the separation process, all the young males from first parity dams returned several times after the initial separation, indicating a strong attachment between primiparous mares and their male offspring. The other five separated only once without rejoining. Our observations showed five variable behavior patterns of young males at separation time, depending on the consort relation between their mothers and harem stallion and the reason for separation at that time. Eight young males separated in the non-breeding season at average 2.1 years and the other two separated in the breeding season at average 3 years and the average difference was not significant. These results revealed that 80% of the young males separated voluntarily when the natural resources become poor whereas 20% separated when their siblings were born. |
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Equine Behaviour @ team @ |
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2209 |
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Author |
Delacour, J. |
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Title |
Object Perception and Recognition: A Model for the Scientific Study of Consciousness |
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1997 |
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Theory Psychology |
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7 |
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2 |
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257-262 |
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The main obstacles to the scientific study of consciousness are its subjectivity and its complexity. Object perception and recognition (OPR) can be a useful model in such a study because there is a remarkable agreement between the subjective and objective aspects of OPR; in addition, while OPR is somewhat simpler than other forms of cognition, it adequately represents one characteristic feature of consciousness: intentionality. It thus allows convergent studies of experimental psychology, artificial intelligence and biology, in both humans and animals. Recent advances in the neurophysiology of visual OPR in subhuman primates and its brain imaging in humans provide a vital thread to the neural basis of consciousness, especially of its integrative, unifying character. |
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10.1177/0959354397072007 |
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Equine Behaviour @ team @ |
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2967 |
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Author |
Anderson JR; Gallup GG |
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Title |
Self-recognition in Saguinus? A critical essay |
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1997 |
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Animal Behaviour. |
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Anim. Behav. |
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54 |
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1563 |
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Equine Behaviour @ team @ |
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2978 |
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Bugnyar T; Huber L |
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Push or pull: an experimental study on imitation in marmosets |
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1997 |
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Animal Behaviour. |
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Anim. Behav. |
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54 |
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817 |
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Equine Behaviour @ team @ |
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2984 |
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