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Social facilitation and food partitioning in the queenless ant Dinoponera quadriceps (Hymenoptera: Formicidae)

Nascimento, Fabio S.; Souza, Danilo I. S. A.; Tannure-Nascimento, Ivelize C.; Dantas, Jose O.
Fonte: TAYLOR & FRANCIS LTD; ABINGDON Publicador: TAYLOR & FRANCIS LTD; ABINGDON
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
46.05%
Social facilitation occurs when an animal is more likely to behave in a certain way in response to other animals engaged in the same behaviour. For example, an individual returning to the nest with food stimulates other ants to leave and to forage. In the present study we demonstrate the existence of new facets in the colony organization of Dinoponera quadriceps: a positive feedback between the incoming food and the activation of new foragers, and the occurrence of incipient task partitioning during the food sharing. Lower-ranked workers located inside the nest process protein resources and higher-ranked workers handle smaller pieces and distribute them to the larvae. In conclusion, D. quadriceps has a decentralized pattern of task allocation with a double regulatory mechanism, which can be considered a sophisticated aspect of division of labour in ponerine ants.

Social facilitation of responses during a stimulus paired with electric shock1

Hake, D. F.; Laws, D. R.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /07/1967 EN
Relevância na Pesquisa
46.05%
Key-pecking responses of a pigeon were maintained by a variable-interval schedule of food reinforcement. The responses were suppressed during the occasional presentation of a warning stimulus paired with electric shock. The presence of a second pigeon emitting the same response for food reinforcement reduced the suppression that otherwise occurred during the warning stimulus when the second pigeon was absent. These results reveal that the social facilitation phenomenon can be used to restore behavior that is suppressed by a conditioned aversive stimulus.

Repeated restraint stress alters sensitivity to the social consequences of ethanol in adolescent and adult rats

Varlinskaya, Elena I.; Doremus-Fitzwater, Tamara L.; Spear, Linda P.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
36.2%
Human adolescents consume alcohol largely to enhance social interactions. Adolescent, but not adult rats likewise exhibit ethanol-induced social facilitation under low-stress circumstances. Since the relationship between stress and ethanol sensitivity across ontogeny still has yet to be well explored, the present study sought to characterize possible age-associated differences in the influence of stressor exposure on ethanol-induced changes in social behavior in adolescent [postnatal days (P) 30–36] and adult (P65-71) male and female Sprague-Dawley rats. Animals were repeatedly restrained (90 min/day) for 5 days, followed by examination of ethanol-induced (0, 0.25, 0.5, 0.75, or 1.0 g/kg) alterations in social behaviors on the last day. Results revealed typical age-related differences in sensitivity to ethanol among controls, with adolescents being uniquely sensitive to low-dose ethanol stimulation of social investigation and play fighting, but less sensitive than adults to the social suppression emerging at higher doses. At both ages, stressor exposure decreased sensitivity to social inhibitory effects of ethanol, while augmenting expression of ethanol’s social facilitatory effects. Ethanol also attenuated the stress-related suppression of social motivation at both ages. These results suggest that repeated stressor exposure diminishes age-related differences in the social consequences of ethanol...

Social facilitation in virtual reality-enhanced exercise: competitiveness moderates exercise effort of older adults

Anderson-Hanley, Cay; Snyder, Amanda L; Nimon, Joseph P; Arciero, Paul J
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
46.2%
This study examined the effect of virtual social facilitation and competitiveness on exercise effort in exergaming older adults. Fourteen exergaming older adults participated. Competitiveness was assessed prior to the start of exercise. Participants were trained to ride a “cybercycle;” a virtual reality-enhanced stationary bike with interactive competition. After establishing a cybercycling baseline, competitive avatars were introduced. Pedaling effort (watts) was assessed. Repeated measures ANOVA revealed a significant group (high vs low competitiveness) × time (pre- to post-avatar) interaction (F[1,12] = 13.1, P = 0.003). Virtual social facilitation increased exercise effort among more competitive exercisers. Exercise programs that match competitiveness may maximize exercise effort.

Social facilitation of d-amphetamine self-administration in rats

Gipson, Cassandra D; Yates, Justin R; Beckmann, Joshua S; Marusich, Julia A; Zentall, Thomas R; Bardo, Michael T
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
46.3%
The link between social influence and drug abuse has long been established in humans. However, preclinical animal models of drug abuse have only recently begun to consider the role of social influence. Since social factors influence the initiation and maintenance of drug use in humans, it is important to include these factors in preclinical animal models. The current study examined the effects of the presence of a social partner on responding for sucrose pellets under various motivational conditions, as well as on d-amphetamine (AMPH) self-administration. Rats were trained to lever press for either sucrose pellets or AMPH (0.01 or 0.1 mg/kg/infusion unit dose). Following response stability, a novel same-sex conspecific was presented in an adjacent compartment separated by a clear Plexiglas wall, and responding for sucrose or AMPH reward was measured. Rats were allowed to restabilize, and were subsequently given an additional partner presentation. Presence of the social partner increased responding only during the first partner pairing in the AMPH 0.1 mg/kg/infusion unit dose, whereas inhibition of responding was observed during the first partner pairing during access to the 0.01 mg/kg/infusion unit dose. Under free feed conditions...

Repeated restraint stress alters sensitivity to the social consequences of ethanol differentially in early and late adolescent rats.

Varlinskaya, Elena I.; Truxell, Eric M.; Spear, Linda P.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
36.31%
In rats, considerable differences in the social consequences of acute ethanol are seen across ontogeny, with adolescents being more sensitive to low dose ethanol-induced social facilitation and less sensitive to the social inhibition evident at higher ethanol doses relative to adults. Stressor exposure induces social anxiety-like behavior, indexed via decreases in social preference, and alters responsiveness to the social consequences of acute ethanol by enhancing ethanol-associated social facilitation and anxiolysis regardless of age. Given that substantial ontogenetic differences in the social consequences of ethanol are evident even within the adolescent period, the present study was designed to investigate whether similar stress-associated alterations in social behavior and ethanol responsiveness are evident in early and late adolescents. Juvenile-early adolescent [postnatal days (P) 24-28] and mid-late adolescent (P38-42) male and female Sprague-Dawley rats were repeatedly restrained (90 min/day) for 5 days, followed by examination of ethanol-induced (0, 0.25, 0.5, or 1.0 g/kg) alterations in social behaviors on the last day. Responsiveness to restraint stress in terms of both stress-induced behavioral alterations and stress-associated changes in sensitivity to the social consequences of acute ethanol challenge differed drastically at the two ages. Repeated restraint increased anxiety-like behavior in a social context in older adolescents...

Social facilitation of insect reproduction with motor-driven tactile stimuli

Uzsák, Adrienn; Dieffenderfer, James; Bozkurt, Alper; Schal, Coby
Fonte: The Royal Society Publicador: The Royal Society
Tipo: Artigo de Revista Científica
Publicado em 22/05/2014 EN
Relevância na Pesquisa
46.14%
Tactile stimuli provide animals with important information about the environment, including physical features such as obstacles, and biologically relevant cues related to food, mates, hosts and predators. The antennae, the principal sensory organs of insects, house an array of sensory receptors for olfaction, gustation, audition, nociception, balance, stability, graviception, static electric fields, and thermo-, hygro- and mechanoreception. The antennae, being the anteriormost sensory appendages, play a prominent role in social interactions with conspecifics that involve primarily chemosensory and tactile stimuli. In the German cockroach (Blattella germanica) antennal contact during social interactions modulates brain-regulated juvenile hormone production, ultimately accelerating the reproductive rate in females. The primary sensory modality mediating this social facilitation of reproduction is antennal mechanoreception. We investigated the key elements, or stimulus features, of antennal contact that socially facilitate reproduction in B. germanica females. Using motor-driven antenna mimics, we assessed the physiological responses of females to artificial tactile stimulation. Our results indicate that tactile stimulation with artificial materials...

Tolerance and Social Facilitation in the Foraging Behaviour of Free-Ranging Crows (Corvus corone corone; C. c. cornix)

Miller, Rachael; Schiestl, Martina; Whiten, Andrew; Schwab, Christine; Bugnyar, Thomas
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 01/12/2014 EN
Relevância na Pesquisa
46.19%
Social foraging provides animals with opportunities to gain knowledge about available food. Studies indicate that animals are influenced by social context during exploration and are able to learn socially. Carrion and hooded crows, which are opportunistic generalists with flexible social systems, have so far received little focus in this area. We combined observational and experimental approaches to investigate social interactions during foraging and social influences on crow behaviour within a free-ranging population at Vienna Zoo, which included 115 individually marked crows. We expected the crows to be tolerant of conspecifics during foraging due to high food abundance. We predicted that social context would enhance familiar object exploration, as well as a specific foraging strategy: predation by crows on other species. We found that crows were highly tolerant of one another, as reflected by their high rates of cofeeding – where they fed directly beside conspecific(s) – relative to affiliative or agonistic interactions. Evidence for social facilitation – when the observer’s behaviour is affected by the mere presence of a model – was found in both object exploration and predation behaviour. Specifically, crows touched the objects more frequently when others were present (whilst only approaching the objects when alone)...

The combination of perception of other individuals and exogenous manipulation of arousal enhances social facilitation as an aftereffect: re-examination of Zajonc’s drive theory

Ukezono, Masatoshi; Nakashima, Satoshi F.; Sudo, Ryunosuke; Yamazaki, Akira; Takano, Yuji
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 07/05/2015 EN
Relevância na Pesquisa
46.41%
Zajonc’s drive theory postulates that arousal enhanced through the perception of the presence of other individuals plays a crucial role in social facilitation (Zajonc, 1965). Here, we conducted two experiments to examine whether the elevation of arousal through a stepping exercise performed in front of others as an exogenous factor causes social facilitation of a cognitive task in a condition where the presence of others does not elevate the arousal level. In the main experiment, as an “aftereffect of social stimulus,” we manipulated the presence or absence of others and arousal enhancement before participants conducted the primary cognitive task. The results showed that the strongest social facilitation was induced by the combination of the perception of others and arousal enhancement. In a supplementary experiment, we manipulated these factors by adding the presence of another person during the task. The results showed that the effect of the presence of the other during the primary task is enough on its own to produce facilitation of task performance regardless of the arousal enhancement as an aftereffect of social stimulus. Our study therefore extends the framework of Zajonc’s drive theory in that the combination of the perception of others and enhanced arousal as an “aftereffect” was found to induce social facilitation especially when participants did not experience the presence of others while conducting the primary task.

Exploring fast food consumption behaviours and social influence.

Brindal, Emily
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2010
Relevância na Pesquisa
56.3%
There has been an increase in the consumption of convenience-style foods. This change has occurred concurrently with a global rise in obesity rates which has led to some researchers blaming the increased consumption of ‘big brand’ fast foods (such as McDonald’s) for expanding waistlines. Nutritional profiling in the initial study showed that the energy provided in a typical fast food meal seemed ‘appropriate’ in terms of a general daily intake but that increased meal sizes, poor ordering decisions and choice of fast food restaurant could influence energy balance and long-term health outcomes. Even though fast foods are occupying a larger part of the diet, limited previous research has explored how social influences (including modelling, social norms and social facilitation) may increase the intake of fast foods. Therefore the aim of this dissertation was to explore environmental, social and demographic influences on the amount of fast food consumed at a single eating occasion. The Fast Food Survey (FFS) was developed and administered to two samples to collect information – including the item/s eaten and any social, environmental or demographic influences that surrounded the consumption – on participants’ most recent visit to one of the large fast food chains in Australia. Results from an initial sample (n=116) revealed both the effectiveness of the program that delivered the FFS and support for the hypothesis that environmental and social factors could influence the amount of fast food consumed. A second study using the FFS aimed to test and develop an existing model of social facilitation (originally developed using ‘general’ eating behaviours) in the specific context of fast food consumption. Accordingly...

Does meal duration predict amount consumed in lone diners? An evaluation of the time-extension hypothesis

Brindal, E.; Wilson, C.; Mohr, P.; Wittert, G.
Fonte: Elsevier BV Publicador: Elsevier BV
Tipo: Artigo de Revista Científica
Publicado em //2011 EN
Relevância na Pesquisa
46.24%
The time-extension hypothesis has been proposed to describe why social facilitation (the tendency for presence of co-eaters to increase the amount eaten) occurs amongst groups of diners. However, it is possible that time-extension could increase the amount eaten in the absence of social effects. Therefore, the aim of this study was to assess whether prolonged exposure to a food environment without social interaction could increase consumption. Lone diners (n=141) were observed eating in a fast food environment. The items consumed, meal duration, estimated demographics (sex, weight status and age) and whether or not the participant was reading were recorded unobtrusively. Lone diners who were reading spent longer eating (M=17.36; SD=8.23) than those who were not (M=8.88; SD=5.47), but energy intake was less than 200 kJ greater, and not overall related to time spent eating. The fact that time-extension did not alter the amount eaten in lone diners is discussed in the context of previous studies and the theory of social facilitation.; Emily Brindal, Carlene Wilson, Philip Mohr, Gary Wittert

Estudio multidimensional de algunas prácticas de justicia restaurativa en el País Vasco con lentes de trabajo social

Olalde Altarejos, Alberto José
Fonte: Universidade de Múrcia Publicador: Universidade de Múrcia
Tipo: Tese de Doutorado Formato: application/pdf
SPA
Relevância na Pesquisa
46.02%
OBJETIVOS • Estudiar, comprender y reflexionar sobre el fenómeno de la práctica de la justicia restaurativa desde el prisma de cinco lentes (epistemológica, contextual, ética, personal y metodológica) en dos realidades profesionales de justicia restaurativa: o Servicio de Mediación Penal de Barakaldo (Bizkaia) en el periodo 2007-2010. o Encuentros restaurativos en victimización terrorista generada por ETA (2010-2012). • Conocer los efectos del contexto del sistema penal en la práctica de la persona mediadora. • Conocer las posibilidades de la presencia meditativa para la práctica restaurativa. • Estudiar y reflexionar sobre el vínculo y las aportaciones del trabajo social a la práctica de justicia restaurativa (terapia narrativa, paradigma de fortalezas, la perspectiva comunitaria, la perspectiva de acompañamiento y relación de ayuda). • Estudiar en profundidad las características y resultados de la práctica de justicia restaurativa del Servicio de Mediación Penal de Barakaldo. METODOLOGÍA • Análisis documental de literatura especializada, prensa, investigaciones del Foro Europeo de Justicia Restaurativa, proyectos y memorias de los Servicios de Mediación Penal de Barakaldo y Catalunya. • Ejercicio de sistematización individual de la práctica a través de dos mecanismos: o Examen crítico de la propia experiencia mediadora en el Servicio de Mediación Penal de Barakaldo...

Gender Dimensions of Trade Facilitation and Logistics : A Guidance Note

Higgins, Kate
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Publications & Research :: Working Paper; Publications & Research
ENGLISH; EN_US
Relevância na Pesquisa
36.24%
Gender equality is a vital instrument for development. In trade related interventions, taking gender equality into account not only spurs country competitiveness, but also helps obtain better outcomes. The World Bank's international trade department and the gender and development unit in the Poverty Reduction and Economic Management network are collaborating to produce guidance notes in order to help people working in the field identify and assess the gender dimensions of trade projects. This guidance note focuses on trade facilitation and logistics initiatives, which seek to improve customs and border management, trade infrastructure, port efficiency, transport security, logistics and transport services, regional trade corridors and transit and multimodal transport. The guidance note demonstrates why gender matters for trade facilitation and logistics and how gender dimensions can be integrated into trade facilitation and logistics initiatives. The ultimate objective of the note is to support World Bank staff to enhance the effectiveness of the World Banks's trade-related work by integrating a gender perspective into trade-related policy dialogue...

Predictors of academic achievement and social competence in adolescence : facilitation, inhibition and general cognitive processing /

Pailing, Patricia.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
ENG
Relevância na Pesquisa
36.36%
The relevance of attentional measures to cognitive and social adaptive behaviour was examined in an adolescent sample. Unlike previous research, the influence of both inhibitory and facilitory aspects of attention were studied. In addition, contributions made by these attentional processes were compared with traditional psychometric measures of cognitive functioning. Data were gathered from 36 grade 10 and 1 1 high school students (20 male and 16 female students) with a variety of learning and attentional difficulties. Data collection was conducted in the course of two testing sessions. In the first session, students completed questionnaires regarding their medical history, and everyday behaviours (the Brock Adaptive Functioning Questionnaire), along with non-verbal problem solving tasks and motor speed tasks. In the second session, students performed working memory measures and computer-administered tasks assessing inhibitory and facilitory aspects of attention. Grades and teacher-rated measures of cognitive and social impulsivity were also gathered. Results indicate that attentional control has both cognitive and social/emotional implications. Performance on negative priming and facilitation trials from the Flanker task predicted grades in core courses...

Social Facilitation Revisited: Increase in Foraging Efforts and Synchronization of Running in Domestic Chicks

Ogura, Yukiko; Matsushima, Toshiya
Fonte: Frontiers Research Foundation Publicador: Frontiers Research Foundation
Tipo: Artigo de Revista Científica
Publicado em 21/07/2011 EN
Relevância na Pesquisa
46.26%
Social influences on foraging efforts were examined in domestic chicks by investigating the frequency of runs made to feeders and the amount of pecking to gain food. Single or paired chicks foraged in an I-shaped maze equipped with a millet feeder on each end, that distributed one or two grains at variable intervals. Regardless of when the grain(s) were dispensed, chicks ran back and forth between the feeders. Analyses of their movement patterns revealed: (1) running patterns were not directly synchronized with the dispensing of grain(s), (2) running distance was longer in paired chicks than in single chicks, (3) paired chicks partially synchronized their runs between feeders, and (4) social effects were immediate but cumulative after repeated blocks. We further examined the social effects on running by dividing the I-maze into two parallel lanes separated by a transparent wall, so that kleptoparasitic interference of food did not occur. Again, the chicks increased their running speed and were even more synchronized with their partner's movements, indicating that food competition alone was not responsible for increased foraging effort. The number of pecks to get grains was also assessed under conditions where the food tray was gradually replaced...

Sensory Cues Involved in Social Facilitation of Reproduction in Blattella germanica Females

Uzsák, Adrienn; Schal, Coby
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 06/02/2013 EN
Relevância na Pesquisa
46.18%
Cockroaches, like many other animal species, form aggregations in which social stimuli from conspecifics can alter the physiology, morphology, or behavior of individuals. In adult females of the German cockroach, Blattella germanica, social isolation slows oocyte development, sexual maturation, and sexual receptivity, whereas social interactions as minimal as between just two females accelerate reproduction; however, the sensory modalities and pathways that mediate these physiological and behavioral changes are poorly understood. We explored the roles of visual, olfactory, and tactile cues in the reproductive physiology of German cockroach females, and whether their effects are species-specific and related to circadian time. Our results show that tactile cues are the primary sensory input associated with social conditions—with no evidence for involvement of the visual and olfactory systems—and that the antennae play an important role in the reception of these tactile cues. This conclusion is supported by the observation that interactions with other insect species of similar or larger size and with similar antennal morphology also stimulate oocyte development in B. germanica. Social facilitation of reproduction is expected to be influenced by the circadian timing system...

Insensitivity to social reputation in autism

Izuma, Keise; Matsumoto, Kenji; Camerer, Colin F.; Adolphs, Ralph
Fonte: National Academy of Sciences Publicador: National Academy of Sciences
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
45.98%
People act more prosocially when they know they are watched by others, an everyday observation borne out by studies from behavioral economics, social psychology, and cognitive neuroscience. This effect is thought to be mediated by the incentive to improve one's social reputation, a specific and possibly uniquely human motivation that depends on our ability to represent what other people think of us. Here we tested the hypothesis that social reputation effects are selectively impaired in autism, a developmental disorder characterized in part by impairments in reciprocal social interactions but whose underlying cognitive causes remain elusive. When asked to make real charitable donations in the presence or absence of an observer, matched healthy controls donated significantly more in the observer's presence than absence, replicating prior work. By contrast, people with high-functioning autism were not influenced by the presence of an observer at all in this task. However, both groups performed significantly better on a continuous performance task in the presence of an observer, suggesting intact general social facilitation in autism. The results argue that people with autism lack the ability to take into consideration what others think of them and provide further support for specialized neural systems mediating the effects of social reputation.

Social Facilitation of Cognition in Rhesus Monkeys: Audience Vs. Coaction

Reynaud, Amélie J.; Guedj, Carole; Hadj-Bouziane, Fadila; Meunier, Martine; Monfardini, Elisabetta
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 01/12/2015 EN
Relevância na Pesquisa
46.14%
Social psychology has long established that the mere presence of a conspecific, be it an active co-performer (coaction effect), or a passive spectator (audience effect) changes behavior in humans. Yet, the process mediating this fundamental social influence has so far eluded us. Brain research and its nonhuman primate animal model, the rhesus macaque, could shed new light on this long debated issue. For this approach to be fruitful, however, we need to improve our patchy knowledge about social presence influence in rhesus macaques. Here, seven adults (two dyads and one triad) performed a simple cognitive task consisting in touching images to obtain food treats, alone vs. in presence of a co-performer or a spectator. As in humans, audience sufficed to enhance performance to the same magnitude as coaction. Effect sizes were however four times larger than those typically reported in humans in similar tasks. Both findings are an encouragement to pursue brain and behavior research in the rhesus macaque to help solve the riddle of social facilitation mechanisms.

Crítica teórica y práctica a la Teoría de la Facilitación Social

Loriente Zamora, Cristóbal
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Article; info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2007 SPA
Relevância na Pesquisa
56.3%
La teoría de la facilitación social es una de las más paradigmáticas de la psicología social porque representa el carácter científico y experimentalista de la disciplina; sin embargo, en este artículo creemos demostrar que dicha teoría recurre a muestras sesgadas de población para validar sus hipótesis: las tareas investigadas son prácticas o productivas omitiendo otras más humanas y cotidianas como dialogar u orinar. La teoría de la facilitación social, lejos de alcanzar la objetividad, refleja la ideología de la psicología social americana porque ignora funciones humanas básicas y comunidades estigmatizados como tartamudos y paruréticos.; Social facilitation theory is one of the most paradigmatic examples of social psychology, understood as an experimental science. However, in this paper we intend to demonstrate that the research that allegedly supports it suffers from a number of defects. It uses biased population samples, and the tasks it sets its experimental subjects are limited to the practical or productive, ignoring the broader range of everyday activities such as conversing or, indeed, urinating. Social facilitation theory, far from being objective, is a microcosm of American social psychology ideology insofar as it ignores basic human functions...

Facilitação social na escavação do solo por pequenos grupos de obreiras Atta sexdens rubropilosa; .

Rodrigues, Maria Margarida Pereira; Universidade Federal do Espírito Santo; Ribeiro, Fernando Leite; Departamento de Psicologia Experimental - Universidade de São Paulo
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/01/1991 POR
Relevância na Pesquisa
45.95%
O objetivo deste trabalho foi investigar se as condições sociais afetavam a escavação de obreiras colocadas em pequenos grupos. As obreiras eram colocadas, em grupo ou solitariamente, em caixas experimentais contendo terra e alimento. Durante 5 dias foram registrados o número de túneis escavados e os aprofundamentos desses túneis. Obtivemos que a extensão média per capita escavada por obreiras em condição grupo foi maior que a extensão média per capita escavada por solitárias. Essa diferença, no entanto, não foi considerada estatisticamente significativa. O número de túneis de caixa, por outro lado, não aumenta proporcionalmente com o número de obreiras. Essa concentração da escavação é provavelmente um indício de organização e, talvez resulte da atração que túneis iniciados exercem sobre as obreiras.; The effect of social conditions on the digging behavior of worker ants in small groups was studied. The workers were tested either alone or in small groups in exprimental boxes provided with soil and food. During 5 days the amount and depth of tunnels were recorded. Regardind tunnel lenght, it has been observed that the mean per capita outcome of groups animals is better than that of single worker ants...