Gregory Charles Westergaard
Dados Biográficos
| ID | 116899 |
|---|---|
| NOME | Gregory Charles Westergaard |
| PRENOMES | Gregory Charles |
| SOBRENOME | Westergaard |
| ASSINATURA | WESTERGAARD G C |
| AFILIAÇÕES | National Institutes of Health |
| VERIFICADO | Não |
| TOTAL DE OBRAS | 35 |
| TOTAL DE CITAÇÕES | 132 |
| TOTAL COMO AUTOR | 35 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1987 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2001 |
| ÍNDICE H | 8 |
Skeletal evidence for precision gripping inCebus apella
Rhesus Macaque (Macaca mulatta) group formation and housing
In the present report, we examined the effects of group formation strategy and corral design on wounding and reproduction rates in rhesus macaques. Specifically, we examined group formation using a staged strategy, in which small groups of animals were introduced incrementally over a period of weeks, and a rapid formation strategy, in which all animals were introduced in 1 day. We also examined group formation using a divided corral design that f…
Rhesus Macaque (Macaca mulatta) group formation and housing
In the present report, we examined the effects of group formation strategy and corral design on wounding and reproduction rates in rhesus macaques. Specifically, we examined group formation using a staged strategy, in which small groups of animals were introduced incrementally over a period of weeks, and a rapid formation strategy, in which all animals were introduced in 1 day. We also examined group formation using a divided corral design that f…
Manipulative Tendencies of Captive Cebus albifrons
Carrying, Sharing, and Hand Preference in Tufted Capuchins (Cebus apella)
Effects of upright posture on hand preference for reaching vs. the use of probing tools by tufted capuchins (Cebus apella)
This research examined the effects of task (reaching vs. tool use) and posture (quadrupedal vs. bipedal) on hand preference in tufted capuchins (Cebus apella). Regarding direction of hand preference, we found a significant main effect of posture, as the bipedal stance elicited greater use of the right hand than did the quadrupedal stance, and a significant posture x task interaction, as bipedal reaching elicited greater use of the right hand than…
Aimed Throwing as a Means of Food Transfer Between Tufted Capuchins (Cebus apella)
What Capuchin Monkeys Can Tell Us About the Origins of Hominid Material Culture
Capuchin monkeys are well-known for their extensive manipulative propen sities which rival those of chimpanzees. This report examines the produc tion and use of tools by capuchins with the aim of gaining insight into the origins of hominid material culture. It is proposed that research examining tool-making and tool-using in extant nonhuman primates can facilitate greater understanding of the mental life of Homo habilis and other early hominid sp…
Transfer of tools and food between groups of tufted capuchins (Cebus apella)
This research examined tool and food transfer between two groups of tufted capcuhin monkeys (Cebus apella). Subjects in one group transferred stones to subjects in a second group who in turn used the stones as cutting tools and then transferred food to subjects in the first group. Aspects of the capuchins' behavior are similar to those described for food-sharing in Cebus, cooperative tool use in Papio, and tool and food exchange in Pan. We propos…
Transfer of tools and food between groups of tufted capuchins (Cebus apella)
This research examined tool and food transfer between two groups of tufted capcuhin monkeys (Cebus apella). Subjects in one group transferred stones to subjects in a second group who in turn used the stones as cutting tools and then transferred food to subjects in the first group. Aspects of the capuchins' behavior are similar to those described for food-sharing in Cebus, cooperative tool use in Papio, and tool and food exchange in Pan. We propos…
Modification of Clay Forms by Tufted Capuchins (Cebus apella)
Ant-Gathering with Tools by Captive Tufted Capuchins (Cebus apella)
Capuchin monkey (Cebus apella) grips for the use of stone tools
This research examined capuchin monkey (Cebus apella) grips for the use of throwing, nut-cracking and cutting tools. We provided subjects with stones and apparatus that accommodated the use of stones as tools. Our subjects exhibited five grips, two of which the animals used when force was the primary consideration (power grips) and three of which the animals used when accuracy of sensory judgment and instrumentation was required (precision grips)…
The use of naturally-occurring copper and iron tools by monkeys
Hand preference for stone artefact production and tool-use by monkeys
Mirror inspection varies with age and tool-using ability in tufted capuchin monkeys (Cebus apella)
The manufacture and use of bamboo tools by monkeys
The stone tools of capuchins (Cebus apella)
Pestle use and modification by tufted capuchins (Cebus apella)
The stone-tool technology of capuchin monkeys
Research with captive capuchin monkeys has demonstrated that these New World primates produce flaked stone artifacts that they use as cutting tools, and that they exhibit patterns of right‐handedness analogous to those of tool‐making Plio‐Pleistocene hominids. These findings indicate that the cognitive and biomechanical conditions of pre‐adaptation for the production and use of stone tools are present in extant nonhuman primates, and that capuchi…
The Production and Use of Digging Tools by Monkeys
This research examined the production and use of digging tools by tufted capuchin monkeys (Cebus apella). We provided groups of subjects with sticks and containers that held peanuts buried in hard-packed earth. Nine of the ten subjects used their fingers to loosen earth and their hands to scoop away soil. Four of these subjects used sticks as digging tools, and three of them produced tools for this purpose. Similarities were noted between the dig…
Hierarchical complexity of combinatorial manipulation in capuchin monkeys ( Cebus apella )
The purpose of this study was to examine the hierarchical complexity of combinatorial manipulation in capuchin monkeys ( Cebus apella ). Two experiments were conducted. In Experiment 1 capuchins were presented with an apparatus designed to accommodate the use of probing tools. In Experiment 2 the same capuchins were presented with sets of nesting containers. Five of the ten subjects used probing tools and seven subjects placed objects in the cont…
Theories of mind and self-recognition
Theories of mind and self-recognition
The responses of bonobos (Pan paniscus) to their mirror images
Hand preference for stone artefact production and tool-use by monkeys
A simple stone-tool technology in monkeys
The stone-tool technology of capuchin monkeys
Research with captive capuchin monkeys has demonstrated that these New World primates produce flaked stone artifacts that they use as cutting tools, and that they exhibit patterns of right‐handedness analogous to those of tool‐making Plio‐Pleistocene hominids. These findings indicate that the cognitive and biomechanical conditions of pre‐adaptation for the production and use of stone tools are present in extant nonhuman primates, and that capuchi…
The subsistence technology of capuchins
Aimed throwing of stones by tufted capuchin monkeys (Cebus apella)
Stone-Tool Bone-Surface Modification by Monkeys
The Use and Modification of Bone Tools by Capuchin Monkeys
The manufacture and use of bamboo tools by monkeys
Ant-Gathering with Tools by Captive Tufted Capuchins (Cebus apella)
The stone tools of capuchins (Cebus apella)
The use of probing tools by tufted capuchins (cebus apella)
Pestle use and modification by tufted capuchins (Cebus apella)
The Production and Use of Digging Tools by Monkeys
This research examined the production and use of digging tools by tufted capuchin monkeys (Cebus apella). We provided groups of subjects with sticks and containers that held peanuts buried in hard-packed earth. Nine of the ten subjects used their fingers to loosen earth and their hands to scoop away soil. Four of these subjects used sticks as digging tools, and three of them produced tools for this purpose. Similarities were noted between the dig…
Manipulative Tendencies of Captive Cebus albifrons
Carrying, Sharing, and Hand Preference in Tufted Capuchins (Cebus apella)
Aimed Throwing as a Means of Food Transfer Between Tufted Capuchins (Cebus apella)
Mirror inspection varies with age and tool-using ability in tufted capuchin monkeys (Cebus apella)
The responses of bonobos (Pan paniscus) to their mirror images
Modification of Clay Forms by Tufted Capuchins (Cebus apella)
Self-treatment of wounds by a capuchin monkey (Cebus apella)
Manipulation of objects in a captive group of lion‐tailed macaques ( Macaca silenus )
The purpose of this study was to investigate the manipulative propensities of a captive group of lion‐tailed macaques ( Macaca silenus ). Simple natural objects (browse and bamboo poles) were provided regularly in the home cage. Findings indicate richness in the frequency and form of manipulative activities, with juvenile males manipulating the test objects more frequently and exhibiting more goal‐directed manipulative activity than adult females…
Self-treatment of wounds by a capuchin monkey (Cebus apella)
Use of a tool-set by capuchin monkeys (Cebus apella)
Hand preference in capuchin monkeys varies with age
Hierarchical complexity of combinatorial manipulation in capuchin monkeys ( Cebus apella )
The purpose of this study was to examine the hierarchical complexity of combinatorial manipulation in capuchin monkeys ( Cebus apella ). Two experiments were conducted. In Experiment 1 capuchins were presented with an apparatus designed to accommodate the use of probing tools. In Experiment 2 the same capuchins were presented with sets of nesting containers. Five of the ten subjects used probing tools and seven subjects placed objects in the cont…
Theories of mind and self-recognition
Theories of mind and self-recognition
The responses of bonobos (Pan paniscus) to their mirror images
Aimed throwing of stones by tufted capuchin monkeys (Cebus apella)
The subsistence technology of capuchins
The use of probing tools by tufted capuchins (cebus apella)
A simple stone-tool technology in monkeys
Stone-Tool Bone-Surface Modification by Monkeys
The Use and Modification of Bone Tools by Capuchin Monkeys
Mirror inspection varies with age and tool-using ability in tufted capuchin monkeys (Cebus apella)
The manufacture and use of bamboo tools by monkeys
The stone tools of capuchins (Cebus apella)
Pestle use and modification by tufted capuchins (Cebus apella)
The stone-tool technology of capuchin monkeys
Research with captive capuchin monkeys has demonstrated that these New World primates produce flaked stone artifacts that they use as cutting tools, and that they exhibit patterns of right‐handedness analogous to those of tool‐making Plio‐Pleistocene hominids. These findings indicate that the cognitive and biomechanical conditions of pre‐adaptation for the production and use of stone tools are present in extant nonhuman primates, and that capuchi…
The Production and Use of Digging Tools by Monkeys
This research examined the production and use of digging tools by tufted capuchin monkeys (Cebus apella). We provided groups of subjects with sticks and containers that held peanuts buried in hard-packed earth. Nine of the ten subjects used their fingers to loosen earth and their hands to scoop away soil. Four of these subjects used sticks as digging tools, and three of them produced tools for this purpose. Similarities were noted between the dig…
The use of naturally-occurring copper and iron tools by monkeys
Hand preference for stone artefact production and tool-use by monkeys
Transfer of tools and food between groups of tufted capuchins (Cebus apella)
This research examined tool and food transfer between two groups of tufted capcuhin monkeys (Cebus apella). Subjects in one group transferred stones to subjects in a second group who in turn used the stones as cutting tools and then transferred food to subjects in the first group. Aspects of the capuchins' behavior are similar to those described for food-sharing in Cebus, cooperative tool use in Papio, and tool and food exchange in Pan. We propos…
Transfer of tools and food between groups of tufted capuchins (Cebus apella)
This research examined tool and food transfer between two groups of tufted capcuhin monkeys (Cebus apella). Subjects in one group transferred stones to subjects in a second group who in turn used the stones as cutting tools and then transferred food to subjects in the first group. Aspects of the capuchins' behavior are similar to those described for food-sharing in Cebus, cooperative tool use in Papio, and tool and food exchange in Pan. We propos…
Modification of Clay Forms by Tufted Capuchins (Cebus apella)
Primate Behavior and Ecology (33 obras) · Biology (31 obras) · Zoology (21 obras) · Child and Animal Learning Development (17 obras) · Psychology (15 obras) · Animal ecology (11 obras) · Animal Vocal Communication and Behavior (11 obras) · Geography (10 obras) · Communication (9 obras) · Ecology (9 obras)