Capuchin monkey tool use: Overview and implications

Nutcracking capuchins are mentioned in reports dating as far back as the sixteenth century,(1,2) as well as in Brazilian folklore.(3) However, it was barely a decade ago that primatologists ""discovered"" the spontaneous use of stones to crack nuts in a semi-free ranging group of tufted capuchin monkeys. Since then, we have found several more capuchin populations in savanna-like environments which(5-7) employ this form of tool use. The evidence so far only weakly supports geneti cally based behavioral differences between populations and does not suggest that dietary pressures in poor environments are proximate determinants of the likelihood of tool use. Instead, tool use within these capuchin populations seems to be a behavioral tradition that is socially learned and is primarily associated with more terrestrial habits. However, differences in the diversity of ""tool kits"" between populations remain to be understood.

ASSOCIATIVE SYMMETRY BY PIGEONS AFTER FEW-EXEMPLAR TRAINING

The present experiment investigated whether pigeons can show associative symmetry on a two-alternative matching to-sample procedure The procedure consisted of a within subject sequence of training and testing with reinforcement and It provided (a) exemplars of symmetrical responding and (b) all prerequisite discriminations among test samples and comparisons After pigeons had learned two arbitrary matching tasks (A B and C D) they were given a reinforced symmetry test for half of the baseline relations (B1-A1 and D1-C1) To control for the effects of reinforcement during testing two novel nonsymmetrical responses were concurrently reinforced using the other baseline stimuli (D2-A2 and B2-C2) Pigeons matched at chance on both types of relations thus indicating no evidence for symmetry These symmetrical and nonsymmetrical relations were then directly trained in order to provide exemplars of symmetry and all prerequisite discriminations for a second test The symmetrical test relations were now B2-A2 and D2-C2 and the nonsymmetrical relations were D1-A1 and B1-C1 On this test 1 pigeon showed clear evidence of symmetry 2 pigeons showed weak evidence and 1 pigeon showed no evidence The previous training of all prerequisite discriminations among stimuli and the within subject control for testing with reinforcement seem to have set favorable conditions for the emergence of symmetry in nonhumans However the variability across subjects shows that methodological variables still remain to be controlled

Characterization of Opsin Gene Alleles Affecting Color Vision in a Wild Population of Titi Monkeys (Callicebus brunneus)

The color vision of most platyrrhine primates is determined by alleles at the polymorphic X-linked locus coding for the opsin responsible for the middle- to long-wavelength (M/L) cone photopigment. Females who are heterozygous at the locus have trichromatic vision, whereas homozygous females and all males are dichromatic. This study characterized the opsin alleles in a wild population of the socially monogamous platyrrhine monkey Callicebus brunneus (the brown titi monkey), a primate that an earlier study suggests may possess an unusual number of alleles at this locus and thus may be a subject of special interest in the study of primate color vision. Direct sequencing of regions of the M/L opsin gene using feces-, blood-, and saliva-derived DNA obtained from 14 individuals yielded evidence for the presence of three functionally distinct alleles, corresponding to the most common M/L photopigment variants inferred from a physiological study of cone spectral sensitivity in captive Callicebus. Am. J. Primatol. 73:189-196, 2011. (C) 2010 Wiley-Liss, Inc.

The protective effect of Canova homeopathic medicine in cyclophosphamide-treated non-human primates

Background: Canova activates macrophages and indirectly induces lymphocyte proliferation. Here we evaluated the effects of Canova in cyclophosphamide-treated non-human primates. Methods: Twelve Cebus apella were evaluated. Four animals were treated with Canova only. Eight animals were treated with two doses of cyclophosphamide (50 mg/kg) and four of these animals received Canova. Body weight, biochemistry and hematologic analyses were performed for 40 days. Micronucleus and comet assays were performed for the evaluation of DNA damage. Results: We observed that cyclophosphamide induced abnormal WBC count in all animals. However, the group treated with cyclophosphamide plus Canova presented a higher leukocyte count than that which received only cyclophosphamide. Cyclophosphamide induced micronucleus and DNA damage in all animals. The frequency of these alterations was significantly lower in the Canova group than in the group without this medicine. Conclusions: Our results demonstrated that Canova treatment minimizes cyclophosphamide myelotoxicity in C. apella. (C) 2012 Elsevier Ltd. All rights reserved.

Flexible and conservative features of social systems in tufted capuchin monkeys: comparing the socioecology of Sapajus libidinosus and Sapajus nigritus

Socioecological models assume that primates adapt their social behavior to ecological conditions, and predict that food availability and distribution, predation risk and risk of infanticide by males affect patterns of social organization, social structure and mating system of primates. However, adaptability and variation of social behavior may be constrained by conservative adaptations and by phylogenetic inertia. The comparative study of closely related species can help to identify the relative contribution of ecological and of genetic determinants to primate social systems. We compared ecological features and social behavior of two species of the genus Sapajus, S. nigritus in Carlos Botelho State Park, an area of Atlantic Forest in Sao Paulo state, and S. libidinosus in Fazenda Boa Vista, a semi-arid habitat in Piaui state, Brazil. S. libidinosus perceived higher predation risk and fed on clumped, high quality, and usurpable resources (fruits) all year round, whereas S. nigritus perceived lower predation risk and relied on evenly distributed, low-quality food sources (leaves) during periods of fruit shortage. As predicted by socioecology models, S. libidinosus females were philopatric and established linear and stable dominance hierarchies, coalitions, and grooming relationships. S. nigritus females competed less often, and could transfer between groups, which might explain the lack of coalitions and grooming bonds among them. Both populations presented similar group size and composition and the same polygynous mating system. The species differed from each other in accordance with differences in the characteristics of their main food sources, as predicted by socioecological models, suggesting that phylogenetic inertia does not constrain social relationships established among female Sapajus. The similarity in mating systems indicates that this element of the social system is not affected by ecological variables and thus, is a more conservative behavioral feature of the genus Sapajus. Am. J. Primatol. 74:315331, 2012. (c) 2011 Wiley Periodicals, Inc.

Social cliques in male northern muriquis Brachyteles hypoxanthus

Analyses of spatial relationships and social interactions provide insights into the social structure of animal societies and the ways in which social preferences among and between dyads affect higher order social relationships. In this paper we describe the patterns of spatial associations and social interactions among adult male northern muriquis in order to evaluate the dynamics of their social networks above the dyadic levels. Systematic observations were made on the 17 adult males present in a multi-male/multi-female group from April 2004 through February 2005, and in July 2005. Analyses of their spatial relationships identified two distinct male cliques; some adult males (called "N" males) were more connected to the females and immatures than other adult males ("MU" males), which were more connected to one another. Affiliative interactions were significantly higher among dyads belonging to the same clique than to different cliques. Although frequencies of dyadic agonistic interactions were similarly low among individuals within and between cliques, MU males appeared to be subordinate to N males. Nonetheless, there were no significant differences in the copulation rates estimated for MU males and N males. Mutual benefits of cooperation between MU and N cliques in intergroup encounters might explain their ongoing associations in the same mixed-sex group [Current Zoology 58 (2): 342-352, 2012].

Capuchin Monkeys Exercise Self-control by Choosing Token Exchange Over an Immediate Reward

Self-control is a prerequisite for complex cognitive processes such as cooperation and planning. As such, comparative studies of self-control may help elucidate the evolutionary origin of these capacities. A variety of methods have been developed to test for self-control in non-human primates that include some variation of foregoing an immediate reward in order to gain a more favorable reward. We used a token exchange paradigm to test for self-control in capuchin monkeys (Cebus apella). Animals were trained that particular tokens could be exchanged for food items worth different values. To test for self-control, a monkey was provided with a token that was associated with a lower-value food. When the monkey exchanged the token, the experimenter provided the monkey with a choice between the lower-value food item associated with the token or another token that was associated with a higher-value food. If the monkey chose the token, they could then exchange it for the higher-value food. Of seven monkeys trained to exchange tokens, five demonstrated that they attributed value to the tokens by differentially selecting tokens for higher-value foods over tokens for lower-value foods. When provided with a choice between a food item or a token for a higher-value food, two monkeys selected the token significantly more than expected by chance. The ability of capuchin monkeys to forego an immediate food reward and select a token that could then be traded for a more preferred food demonstrated some degree of self-control. Thus, results suggest a token exchange paradigm could be a successful technique for assessing self-control in this New World species.

The Use of Human and Conspecific Gestures By Capuchin Monkeys to Solve an Object-Choice Task

Most primates live in highly complex social systems, and therefore have evolved similarly complex methods of communicating with each other. One type of communication is the use of manual gestures, which are only found in primates. No substantial evidence exists indicating that monkeys use communicative gestures in the wild. However, monkeys may demonstrate the ability to learn and/or use gestures in certain experimental paradigms since they¿ve been shown to use other visual cues such as gaze. The purpose of this study was to investigate if ten brown capuchin monkeys (Cebus apella) were able to use gestural cues from monkeys and a pointing cue from a human to obtain a hidden reward. They were then tested to determine if they could transfer this skill from monkeys to humans and from humans to monkeys. One group of monkeys was trained and tested using a conspecific as the cue giver, and was then tested with a human cue-giver. The second group of monkeys began training and testing with a human cue giver, and was then tested with a monkey cue giver. I found that two monkeys were able to use gestural cues from conspecifics (e.g., reaching) to obtain a hidden reward and then transfer this ability to a pointing cue from a human. Four monkeys learned to use the human pointing cue first, and then transferred this ability to use the gestural cues from conspecifics to obtain a hidden reward. However, the number of trials it took for each monkey to transfer the ability varied considerably. Some subjects spontaneously transferred in the minimum number of trials needed to reach my criteria for successfully obtaining hidden rewards (N = 40 trials), while others needed a large number of trials to do so (e.g. N = 190 trials). Two subjects did not perform successfully in any of the conditions in which they were tested. One subject successfully used the human pointing cue and a human pointing plus vocalization cue, but did not learn the conspecific cue. One subject learned to use the conspecific cue but not the human pointing cue. This was the first study to test if brown capuchin monkeys could use gestural cues from conspecifics to solve an object choice task. The study was also the first to test if capuchins could transfer this skill from monkeys to humans and from humans to monkeys. Results showed that capuchin monkeys were able to flexibly use communicative gestures when they were both unintentionally given by a conspecific and intentionally given by a human to indicate a source of food.

Investigation of Rudimentary Meta-Cognition in Lion-Tailed Macaques and Tufted Capuchins

Meta-cognition, or "thinking about thinking," has been studied extensively in humans, but very little is known about the process in animals. Although great apes and rhesus macaques (Macaca mulatta) have demonstrated multiple apparently meta-cognitive abilities, other species have either been largely ignored or failed to convincingly display meta-cognitive traits. Recent work by Marsh, however, raised the possibility that some species may possess rudimentary or partial forms of meta-cognition. This thesis sought to further investigate this possibility by running multiple comparative experiments. The goal of the first study was to examine whether lion-tailed macaques, a species that may have a rudimentary form of meta-cognition, are able to use an uncertainty response adaptively, and if so, whether they could use the response flexibly when the stimuli for which the subjects should be uncertain changed. The macaques' acquisition of the initial discrimination task is ongoing, and as such there were not yet data to support a conclusion either way. In the second study, tufted capuchins were required to locate a food reward hidden beneath inverted cups that sat on a Plexiglas tray. In some conditions the capuchins were shown where the food was hidden, in others they could infer its location, and in yet others they were not given information about the location of the food. On all trials, however, capuchins could optionally seek additional information by looking up through the Plexiglas into the cups. In general, capuchins did this less often when they were shown the food reward, but not when they could infer the reward's location. These data suggest capuchins only meta-cognitively control their information seeking in some conditions, and thus, add support to the potential for a rudimentary form of meta-cognition. In convergence with other studies, these results may represent early models for rudimentary meta-cognition, although viable alternative explanations still remain.

Geschichte der Juden von ihrer Rückkehr aus der babylonischen Gefangenschaft bis zur Zerstörung des zweyten Tempels

nach Josephus Flavius zunächst für die jüdische Jugend bearbeitet und mit erläuternden Anmerkungen begleitet von Peter Beer

LUCAS 13,1-5 MEMÓRIA PERIGOSA DAS VÍTIMAS

O seguinte trabalho desenvolve o tema da violência contra o movimento popular na Galiléia, segundo o texto de Lucas 13,1-5. Esse texto não tem paralelo nas outras duas fontes sinóticas, nem em João, nem em Tomé, nem no grupo Galileu que escreveu a fonte Q; quanto a esses eventos históricos que narra o texto, não há referência nem em Flávio Josefo, nem em outros historiadores da época. Isso quer dizer, que estes versículos são uma fonte própria de Lucas, uma fonte autônoma, chamada por alguns como fonte L (ou fonte S). A abordagem deste texto de Lucas, feita por grande parte de pesquisadores na área bíblica, preocupa-se com os temas de pecado e arrependimento, deixando na margem a situação das vítimas e as ameaças de Jesus para seus ouvintes. Neste sentido, este trecho de Lucas é de grande importância. Estes versículos expressam a realidade sócio -política. Seu conteúdo é um sinal de conflito e de denúncia contra o sistema imperial romano que não passou desapercebido para o redator do texto e nem para o seu auditório. Trata-se, portanto, da memória das vítimas da opressão. Apresentamos a seguir, a pesquisa em três capítulos esboçados brevemente. O primeiro descreve o agir específico dos procuradores ou governadores romanos, nas províncias comandadas por eles; ao mesmo tempo, a reação do povo e os seus protestos. A nossa ênfase recairá sobre o procurador romano Pôncio Pilatos. Nos valeremos das fontes bíblicas, extra-bíblicas e pseudo-epígrafas. No final, destacaremos a relevância e o papel central do texto Lucas 13,1-5. No segundo capítulo, o centro será a exegese de Lucas 13,1-5, relacionando-o com o contexto maior que, em nosso caso, é chamado itinerário de viagem para Jerusalém , e com um contexto imediato que é o capitulo 13 de Lucas. No final, perguntaremos pelo grupo ou grupos que podem estar por trás destes versículos, e a importância da fonte L, como fonte primeira que se insere no Evangelho de Lucas. O texto de Lucas 13,1-5 aparece como texto autônomo, memória das vítimas; ele contrasta com a visão moderada dos relatos da Paixão nos sinóticos, frente a uma realidade de opressão. O terceiro capítulo constitui-se num ensaio de articulação destes dois capítulos com a realidade atual, especificamente com a situação de guerra, violência e morte na Colômbia, junto aos esforços atuais por reconstruir a memória das vítimas do povo colombiano, memória que dá sentido e dignifica a oferenda de suas vidas.(AU)

LUCAS 13,1-5 MEMÓRIA PERIGOSA DAS VÍTIMAS

O seguinte trabalho desenvolve o tema da violência contra o movimento popular na Galiléia, segundo o texto de Lucas 13,1-5. Esse texto não tem paralelo nas outras duas fontes sinóticas, nem em João, nem em Tomé, nem no grupo Galileu que escreveu a fonte Q; quanto a esses eventos históricos que narra o texto, não há referência nem em Flávio Josefo, nem em outros historiadores da época. Isso quer dizer, que estes versículos são uma fonte própria de Lucas, uma fonte autônoma, chamada por alguns como fonte L (ou fonte S). A abordagem deste texto de Lucas, feita por grande parte de pesquisadores na área bíblica, preocupa-se com os temas de pecado e arrependimento, deixando na margem a situação das vítimas e as ameaças de Jesus para seus ouvintes. Neste sentido, este trecho de Lucas é de grande importância. Estes versículos expressam a realidade sócio -política. Seu conteúdo é um sinal de conflito e de denúncia contra o sistema imperial romano que não passou desapercebido para o redator do texto e nem para o seu auditório. Trata-se, portanto, da memória das vítimas da opressão. Apresentamos a seguir, a pesquisa em três capítulos esboçados brevemente. O primeiro descreve o agir específico dos procuradores ou governadores romanos, nas províncias comandadas por eles; ao mesmo tempo, a reação do povo e os seus protestos. A nossa ênfase recairá sobre o procurador romano Pôncio Pilatos. Nos valeremos das fontes bíblicas, extra-bíblicas e pseudo-epígrafas. No final, destacaremos a relevância e o papel central do texto Lucas 13,1-5. No segundo capítulo, o centro será a exegese de Lucas 13,1-5, relacionando-o com o contexto maior que, em nosso caso, é chamado itinerário de viagem para Jerusalém , e com um contexto imediato que é o capitulo 13 de Lucas. No final, perguntaremos pelo grupo ou grupos que podem estar por trás destes versículos, e a importância da fonte L, como fonte primeira que se insere no Evangelho de Lucas. O texto de Lucas 13,1-5 aparece como texto autônomo, memória das vítimas; ele contrasta com a visão moderada dos relatos da Paixão nos sinóticos, frente a uma realidade de opressão. O terceiro capítulo constitui-se num ensaio de articulação destes dois capítulos com a realidade atual, especificamente com a situação de guerra, violência e morte na Colômbia, junto aos esforços atuais por reconstruir a memória das vítimas do povo colombiano, memória que dá sentido e dignifica a oferenda de suas vidas.(AU)

Flavii Iosephi Opera :

Greek Text with Latin notes.

Jerusalem and Rome : the writings of Josephus /

Mode of access: Internet.