Individual Group Members Research Articles

A Cyber-Security Risk Assessment Methodology for Medical Imaging Devices: the Radiologists' Perspective.

Medical imaging devices (MIDs) are exposed to cyber-security threats. Currently, a comprehensive, efficient methodology dedicated to MID cyber-security risk assessment is lacking. We propose the Threat identification, ontology-based Likelihood, severity Decomposition, and Risk assessment (TLDR) methodology and demonstrate its feasibility and consistency with existing methodologies, while being more efficient, providing details regarding the severity components, and supporting organizational prioritization and customization. Using our methodology, the impact of 23 MIDs attacks (that were previously identified) was decomposed into six severity aspects. Four Radiology Medical Experts (RMEs) were asked to assess these six aspects for each attack. The TLDR methodology's external consistency was demonstrated by calculating paired T-tests between TLDR severity assessments and those of existing methodologies (and between the respective overall risk assessments, using attack likelihood estimates by four healthcare cyber-security experts); the differences were insignificant, implying externally consistent risk assessment. The TLDR methodology's internal consistency was evaluated by calculating the pairwise Spearman rank correlations between the severity assessments of different groups of two to four RMEs and each of their individual group members, showing that the correlations between the severity rankings, using the TLDR methodology, were significant (P < 0.05), demonstrating that the severity rankings were internally consistent for all groups of RMEs. Using existing methodologies, however, the internal correlations were insignificant for groups of less than four RMEs. Furthermore, compared to standard risk assessment techniques, the TLDR methodology is also sensitive to local radiologists' preferences, supports a greater level of flexibility regarding risk prioritization, and produces more transparent risk assessments.

Safety in numbers: how social choice theory can inform avalanche risk management

ABSTRACT Avalanche studies have undergone a transition in recent years. Early research focused mainly on environmental factors. More recently, attention has turned to human factors in decision making, such as behavioural and cognitive biases. This article adds a social component to this human turn in avalanche studies. It identifies lessons for decision making by groups of skiers from the perspective of social choice theory, a sub-field of economics, decision theory, philosophy and political science that investigates voting methods and other forms of collective decision making. In the first part, we outline the phenomenon of wisdom of crowds, where groups make better decisions than their individual members. Drawing on the conceptual apparatus of social choice theory and using idealised scenarios, we identify conditions under which wisdom of crowds arises and also explain how and when deciding together can instead result in worse decisions than may be expected from individual group members. In the second part, we use this theoretical understanding to offer practical suggestions for decision making in avalanche terrain. Finally, we make several suggestions for risk management in other outdoor and adventure sports and for outdoor sports education.

Profile Aggregation-Based Group Recommender Systems: Moving From Item Preference Profiles to Deep Profiles

To meet the increasing demand for group activities, single-user recommender systems need to be scaled up to provide recommendations to groups of users. This issue is solved by aggregating item preference profiles of individual group members into a single item preference profile, thereby allowing recommendations to be created for this item preference profile. In this paper, we introduce the concept of deep profiles of users, and we propose group recommendation methods based on the aggregation of group members’ deep profiles, instead of item preference profiles as in previous studies. The term <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">deep profile</i> refers to the users’ profiles that lie deep within the recommendation algorithms. Experiments have shown that group recommendations based on deep profiles give higher efficiency in terms of F1-score and nDCG than those based on item preference profiles.

Group value learned through interactions with members: A reinforcement learning account

How do group-based interaction tendencies form through encounters with individual group members? In four experiments, in which participants interacted with group members in a reinforcement learning task presented as a money sharing game, participants formed instrumental reward associations with individual group members through direct interaction and feedback. Results revealed that individual-level reward learning generalized to a group-based representation, as indicated in self-reported group attitudes, trait impressions, and the tendency to choose subsequent interactions with novel members of the group. Experiments 3 and 4 further demonstrated that group-based reward effects on interaction choices persisted even when past group reward value was no longer predicted of future positive outcomes, consistent with a habit-like expression of group bias. These results demonstrate a novel process of prejudice formation based on instrumental reward learning from direct interactions with individual group members. We discuss implications for existing theories of prejudice, the role of habit in intergroup bias, and intervention strategies to reduce prejudice.

Benefits and costs of social foraging in velvet worms

AbstractGroup living is ubiquitous in nature, and social foraging is among the common forms of cooperative behaviour in animals. Understanding the evolution and maintenance of social foraging requires knowledge of the underlying benefits and costs to group members, though these are only known for few model taxa, which often lie at the extremes of social organisation. Here, we experimentally examined hypothesised benefits and costs of social foraging in the velvet wormEuperipatoides rowelli; the only Onychophoran currently known to live and forage in groups. To explore benefits, we tested the effects of natural group size and controlled prey size on the latency to attack and begin consuming prey, the likelihood of complete prey consumption and the time taken to completely consume prey. Our focal cost was aggressive intraspecific interactions in the form of biting, kicking and striking, which may present a particular risk to soft‐bodied velvet worms. As predicted, we found a positive scaling of most effects with the size of foraging groups. Larger groups were faster to attack and begin consuming prey, and more likely to completely consume prey, though they took longer to do so. This may be a consequence of the increasing representation of juveniles in larger aggregations. However, larger groups were also subject to heightened aggression among conspecifics, though is it unclear whether such a cost holds at the level of individual group members. Variation in prey size and, hence, resource availability had little effect across all outcomes, except for a slightly reduced likelihood of completely consuming larger prey. A time‐course analysis of individual activity suggested the existence of feeding hierarchies with adults excluding juveniles, particularly when resources are scarce. Taken together, our results offer the first support for the existence of foraging benefits and costs to group membership inE. rowelli, which may contribute to the maintenance of group living in this evolutionary significant taxon.

The Potential for Physiological Performance Curves to Shape Environmental Effects on Social Behavior.

As individual animals are exposed to varying environmental conditions, phenotypic plasticity will occur in a vast array of physiological traits. For example, shifts in factors such as temperature and oxygen availability can affect the energy demand, cardiovascular system, and neuromuscular function of animals that in turn impact individual behavior. Here, we argue that nonlinear changes in the physiological traits and performance of animals across environmental gradients—known as physiological performance curves—may have wide-ranging effects on the behavior of individual social group members and the functioning of animal social groups as a whole. Previous work has demonstrated how variation between individuals can have profound implications for socially living animals, as well as how environmental conditions affect social behavior. However, the importance of variation between individuals in how they respond to changing environmental conditions has so far been largely overlooked in the context of animal social behavior. First, we consider the broad effects that individual variation in performance curves may have on the behavior of socially living animals, including: (1) changes in the rank order of performance capacity among group mates across environments; (2) environment-dependent changes in the amount of among- and within-individual variation, and (3) differences among group members in terms of the environmental optima, the critical environmental limits, and the peak capacity and breadth of performance. We then consider the ecological implications of these effects for a range of socially mediated phenomena, including within-group conflict, within- and among group assortment, collective movement, social foraging, predator-prey interactions and disease and parasite transfer. We end by outlining the type of empirical work required to test the implications for physiological performance curves in social behavior.

Social Relationship Strength Modulates the Similarity of Brain-to-Brain Representations of Group Members.

Within our societies, humans form co-operative groups with diverse levels of relationship quality among individual group members. In establishing relationships with others, we use attitudes and beliefs about group members and the group as a whole to establish relationships with particular members of our social networks. However, we have yet to understand how brain responses to group members facilitate relationship quality between pairs of individuals. We address this here using a round-robin interpersonal perception paradigm in which each participant was both a perceiver and target for every other member of their group in a set of 20 unique groups of between 5 and 6 members in each (total N = 111). Using functional magnetic resonance imaging, we show that measures of social relationship strength modulate the brain-to-brain multivoxel similarity patterns between pairs of participants' responses when perceiving other members of their group in regions of the brain implicated in social cognition. These results provide evidence for a brain mechanism of social cognitive processes serving interpersonal relationship strength among group members.

ВИКОРИСТАННЯ ВОРКШОПУ В ПРОЦЕСІ ВИКЛАДАННЯ МЕДИЧНОЇ ТА БІОЛОГІЧНОЇ ФІЗИКИ СТУДЕНТАМ МЕДИЧНИХ ЗАКЛАДІВ ВИЩОЇ ОСВІТИ

It is relevant to find directions and courses for updating education that will meet the norms of the world community and educational development for a long period. The traditional learning is replaced by interactive learning, which is aimed at increasing the level of cognitive activity of students by improving interaction and communication between students, students and teachers, students in small groups. The article provides a theoretical analysis of the interactive process of teaching medical and biological physics to students of medical and dental faculties of Poltava State Medical University and describes the experience of using a workshop in preparing students for future professional activities. The theoretical bases of introduction of the newest technologies in educational process in establishments of higher education are analyzed. The theoretical foundations of the workshop as an innovative and interactive method of teaching are considered and analyzed. The main stages of the interactive educational event workshop are identified. The role and place of medical and biological physics in the preparation of medical students for future professional activities are clarified. The method of using the workshop method in laboratory-practical classes in medical and biological physics as a way to involve students in an active and productive learning process is presented. It is established that the application of the workshop to the educational process satisfies the requirements of increasing the level of competencies of individual group members due to active group interaction of each participant in the educational process, as well as achieving additional effect in the classroom due to maximum contribution of each group member. The use of interactive methods in preparing students allows to more effectively prepare them for professional activities. &nbsp;&nbsp;&nbsp

Creating an Online Self: Developing Virtual Identity in Online Group Interaction Spaces

Online groups have pervasively become platforms for association and interaction. Hence, it is important to study how interactions on these virtual groups affect the selves of individual group members, and whether communication activities in these groups lead to formation of virtual identities of active members which is distinguishable from their non-mediated identity. To analyze the development of virtual identity, four focus group discussions of ten youthful participants each, who were members of various online groups, were conducted and eight social media experts were interviewed. Concepts of Communication Theory of Identity (CTI) and Uses and Gratification Theory were employed to analyze collected data in assessing how online group interactions that involve fashioning identity, impression management, anonymity and pro-social behavior lead to formation of online group members virtual identity. We first interrogate how these online groups shape behavior online by interrogating the individual group member’s conversations and actions online and paralleling them with their conversations and actions offline. Second, using the three-dimensional identity formation model (Crocetti, Rubini, &amp; Meeus, 2008), we crystalize how these online interactions and behavior cause individual group member’s to feel, think and understand themselves in ways that promote a unique online-self, which we refer to as the virtual identity.

Collective defence and behavioural homogeneity during simulated territorial intrusions in banded mongooses (Mungos mungo)

AbstractConflicts between stable social groups (“intergroup conflicts”) can be damaging and exert a strong influence on within‐group social behaviour. The success of groups during intergroup conflict may depend on the ability of individual group members to converge upon collective defence behaviour, such as approaching or attacking. In principle, collective defence can be achieved via a united front, in which each individual responds in the same way to an intergroup threat. We tested the impact of simulated intergroup conflicts on collective defence and individual behaviour in banded mongooses (Mungos mungo), a cooperatively breeding mammal in which intergroup conflict is particularly common and costly. We presented focal groups with scent markings, call playbacks and caged live animals from rival groups and compared their responses to these stimuli with their responses to own‐group control stimuli. A greater proportion of group members approached the stimulus and acted defensively in response to rival stimuli as compared to controls, consistent with a unified collective defence response. However, counter to our expectation, groups exhibited lower behavioural homogeneity when presented with rival stimuli as compared to controls. A closer examination of the behaviours competitors used revealed that lower homogeneity was driven by a greater use, and diversity, of defensive behaviours relevant to repelling simulated rivals. Finally, group size affected responses: as group size increased, the proportion of members approaching the stimulus and behavioural homogeneity decreased. Our results lend support to the hypothesis that intergroup conflict leads to coordinated collective defence behaviour during the immediate threat of an intergroup conflict. However, collective defence need not mean that all group members execute the same behaviours.

Collective attention in navigating homing pigeons: group size effect and individual differences

One prominent feature of collective attention is the so-called ‘group size effect’. Often documented in studies of vigilance by animals foraging gregariously, this effect describes how individual group members are able to reduce their attention to environmental cues (e.g. predators) as group size increases, since the group can pool information from multiple individuals. Despite extensive literature in one context (foraging–vigilance), it remains unclear whether this effect can be observed in other contexts where animals face different informational demands (e.g. navigation). Using a custom-made sensor combining head-mounted inertial measurement unit and back-mounted GPS, we examined head movement, a proxy for visual scanning behaviour, in homing pigeons, Columba livia , flying alone, in pairs and in flocks (ca. 10 individuals). Individual birds' head movements decreased sharply when they switched from solo to paired flights and again when they switched from paired to flock flights. Homing efficiency (or route straightness) did not decrease in parallel with decreasing head movement but continued to increase over repeated flights. We also found systematic individual differences during flock homing flights, where birds positioned more frontally and more centrally in the flock made larger head movements. Moreover, leaders were positioned more frontally and tended to show larger head movements than followers. Decreased head movement by peripheral birds suggested increased attention to the rest of the flock rather than increased individual vigilance (contra ‘the edge effect’). Overall, our results suggest that individual birds reduced their visual scanning during navigation because of the need to attend closely to fellow flock members to maintain flock cohesion. While reduced per capita visual scanning may reduce the amount of environmental information available to individual birds, it is likely to be compensated by the flock's collective attention. • The group size effect in attention was examined in the context of navigation. • We measured head movement of homing pigeons using a custom-made sensor. • Pigeons flew alone, in pairs, and in flocks (∼10 individuals). • Pigeons decreased their head movement sharply as the flock size increased. • This effect was likely driven by individuals' efforts to maintain flock cohesion.

Explanations for norm violations affect preschoolers' judgments of norm violators.

Preschoolers commonly interpret how a group is as evidence for how individual group members should be-often leading to emphatic disapproval of norm violations (i.e., descriptive-to-prescriptive reasoning). The present research suggests that this tendency is shaped by how preschoolers explain group norm violations. In Study 1, preschoolers held norm violators accountable for their actions (e.g., they evaluated them as bad and withheld resources from them), suggesting that they construed norm violations as internally motivated and avoidable acts deserving of blame. In Study 2, preschoolers were most disapproving of those who violated norms because of preferences (e.g., because they liked to), less disapproving of those who did so because of traits (e.g., because of an aversion), and least disapproving of those who did so because of situations (e.g., because of an external constraint), suggesting that explanations for norm violations affect preschoolers' judgments of norm violators. Thus, similar to a judge's sentence or a jury's verdict, preschoolers' reasoning about the (mis)behavior of others is affected by why the behavior occurred. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

The Rise of \u2018Group Solution\u2019 in Insolvency Law and Bank Resolution

This article traces the emergence of the concept of ‘group solution’ and its manifestations in insolvency law and bank resolution as an alternative to the rigid entity-by-entity approach. The rise of this concept can be linked to the recognition of the specificity of problems related to the insolvency of multinational enterprise groups, arising from group operational and financial interconnectedness. This has not happened at once, but has resulted from the evolution of views and ideas, evident in hard and soft law instruments of the 2000s and the 2010s. In light of this important development the article explores the concept of a group solution, its rationale, scope of application and limitations. It concludes that despite the gradual acceptance of the group phenomenon, a group solution has not been formed as a coherent and well-defined legal principle. Instead, it represents a variety of approaches, tools and practices, which pursue different policy objectives underpinned by different societal values. Among them are asset value maximization, business rescue, the protection of financial stability and the preservation of banks’ critical functions. With all its flexibility, a group solution has one pervasive limitation—it cannot trump the interests of individual group members and their creditors. At the same time, in order to realize the full potential of a group solution, it is necessary to embrace the group-sensitive and forward-looking interpretation of creditors’ interest, facilitating commercially sensible and practical group solutions.

Determining the potential of informal savings groups as a model for formal commitment saving devices

Background: Saving behaviour has attracted research attention over the past 20 years. Typically, individual and household saving rates among low-income groups are inadequate. Research suggests that informal savings groups are effective vehicles for encouraging saving among low-income individuals. Yet little is known about the drivers of positive saving behaviour among informal savings groups, which makes it difficult for formal providers to design interventions that promote higher levels of saving.Aim: This study aimed to explore both the rational and non-rational drivers of saving behaviour among low-income members of informal savings groups, the attributes of informal savings groups that positively influence their collective saving behaviour, and to identify the valued features of savings groups that encourage the adoption of informal commitment saving devices (CSDs).Methods: The study was informed by a literature review followed by field research in which semi-structured interviews were conducted with 10 savings groups and 10 individual members of savings groups. The participants’ perspectives were analysed and compared within the context of behavioural economic theory.Results: The study revealed seven characteristics of informal savings groups that potentially serve as interventions to explain non-rational saving behaviour. It also identified seven features valued by users of informal CSDs (including flexibility, restricted access to savings and no transaction fees) which could be salient to providers of formal CSDs.Conclusion: On the basis of the findings, a behavioural design framework was proposed to inform the design features of formal CSDs that may ensure customer retention and improved saving outcomes.

In situ three‐dimensional video tracking of tagged individuals within site‐attached social groups of coral‐reef fish

AbstractTracking the movement of all individual group members in their natural environment remains a challenging task. Using advances in computer vision and Deep Learning, we developed and tested a semi‐automated in situ tracking system to reconstruct simultaneous three‐dimensional trajectories of marked individuals in social groups of a coral‐reef fish. Our system has a temporal resolution of 10s of milliseconds, allowing for multiple 30‐min tracking sessions that have been repeated over weeks to months. We present the technique and illustrate its application for Dascyllus marginatus, a planktivorous damselfish that lives in social groups associated with branching corals. Our technique identified all individuals 85–100% of the time, with a mean spatial error of ~ 1.3 cm. It provides a cost‐effective semi‐automated tool for in situ research on movements and foraging of individuals within small site‐attached groups of animals in their natural environment.

Perceived Level of Threat and Cooperation.

The evolution of parochial altruism goes hand in hand with intergroup conflict. Helping other group members is evolutionary stable in the presence of an outside threat (Bowles et al., 2003; Guzman et al., 2007), and hostility toward other groups can evolve together with parochial altruism (Choi and Bowles, 2007; Bowles, 2008). Furthermore, group reputation fosters cooperation with fellow group members in times of conflict—even in an environment that does not foster cooperation in times of peace (Hugh-Jones and Zultan, 2013). Social scientists have long documented that intergroup conflict increases intragroup cooperation (Sumner, 1906; Williams, 1947; Simmel, 1955; Coser, 1956). Over a century ago, Sumner (1906) wrote that “the exigencies of war with outsiders are what makes peace inside.” Indeed, prosocial behaviors, such as volunteering and blood donations, increase during times of war or exposure to terror attacks (Schmiedeberg, 1942; Janis, 1951; Glynn et al., 2003; Penner et al., 2005; Steinberg and Rooney, 2005; Gneezy and Fessler, 2012; Berrebi and Yonah, 2016). This phenomenon can be reproduced in experimental settings, either under experimentally induced external threat to the group (Wright, 1943; Feshbach and Singer, 1957; Sherif, 1961, 1966; Burnstein and McRae, 1962; Hargreaves-Heap and Varoufakis, 2002), or in times of interstate conflict (Gneezy and Fessler, 2012). Democratic leaders are also apparently aware of this phenomenon, often dubbed the common enemy effect, as they are more likely to initiate interstate conflict at times of internal unrest or threatened leadership (Sirin, 2011). In this paper, we argue that outside threat has the capacity to both increase and decrease intragroup cooperation. We propose that the crucial psychological variable that determines the response to outside threat is the level at which threat is perceived and construed. Outside threat increases cooperation only if it menaces the group as a whole (Williams, 1947). As intergroup conflict poses a threat both to the group as a whole and to individual group members, the same threat can trigger different—and even opposing—responses, depending on how it is perceived. These perceptions are sensitive to the duration and intensity of the conflict, media coverage, and the salience of various aspects of intergroup conflict. This Perceived Target of Threat principle can be summed thus: individuals who perceive the group to be under threat help the group, whereas an individual who perceives himself to be under threat helps himself (Weisel and Zultan, 2016). In the following, we review empirical support for this principle and discuss its psychological antecedents.

Preliminary Relationship between Overnight Separation and Wounding in Bachelor Groups of Western Lowland Gorillas (Gorilla gorilla gorilla)

• Wounding is lower in groups where individuals are separated overnight. • Overnight housing may increasingly influence wounding rate with social group duration. • Groups can be housed socially overnight for at least 6 years without increased wounding. • This timeline may be influenced by individual trends and group member maturation. • We recommend that organizations begin separating their long-term bachelor units overnight. Despite no significant difference in wounding between bachelor and mixed-sex groups of western lowland gorillas ( Gorilla gorilla gorilla ) in zoological settings, anecdotal concerns around the frequency and severity of wounding in bachelor groups have perpetuated opinions of all-male units as inherently less stable. Bachelor groups are prevalent within zoological organizations and necessitate specialized care and protocols separate from those for mixed-sex groups. We collected survey data on 59 gorillas in 21 bachelor groups across 19 zoos. This survey broadly encompassed group social and demographic history, exhibit design, management practices, and wounding over the past year. Previous experience suggested that overnight housing conditions could be an important influencing factor on wounding rates. We ran Pearson’s Correlations and ANOVAs to examine wounding within the context of overnight housing conditions as well as other management and demographic factors. We found a significant negative correlation between group duration and wounding rate such that wounding rate was lower in groups that were together longer if and only if groups were separated overnight (r=-0.62, N = 11, p = 0.04). This was further supported by ANOVAs which demonstrated that groups that have been together for longer had significantly higher rates of wounding when housed together overnight than when housed separately overnight (F = 3.51, df = 3, 17, p = 0.04). Finally, we found that mature silverbacks housed socially overnight sustain significantly more wounds than mature silverbacks housed separately overnight (F = 4.11; df = 1,31; p = 0.05). Based on our analyses, overnight housing conditions have a significant impact on wounding particularly when paired with long-term (> 7 years) group social history. We recommend that groups with long social histories or primarily mature members be separated overnight should housing facilities allow.

Three heads are better than two: Comparing learning properties and performances across individuals, dyads, and triads through a computational approach.

Although it is considered that two heads are better than one, related studies argued that groups rarely outperform their best members. This study examined not only whether two heads are better than one but also whether three heads are better than two or one in the context of two-armed bandit problems where learning plays an instrumental role in achieving high performance. This research revealed that a U-shaped correlation exists between performance and group size. The performance was highest for either individuals or triads, but the lowest for dyads. Moreover, this study estimated learning properties and determined that high inverse temperature (exploitation) accounted for high performance. In particular, it was shown that group effects regarding the inverse temperatures in dyads did not generate higher values to surpass the averages of their two group members. In contrast, triads gave rise to higher values of the inverse temperatures than their averages of their individual group members. These results were consistent with our proposed hypothesis that learning coherence is likely to emerge in individuals and triads, but not in dyads, which in turn leads to higher performance. This hypothesis is based on the classical argument by Simmel stating that while dyads are likely to involve more emotion and generate greater variability, triads are the smallest structure which tends to constrain emotions, reduce individuality, and generate behavioral convergences or uniformity because of the ''two against one" social pressures. As a result, three heads or one head were better than two in our study.

Hope, Solidarity, and Justice

This article defends an account of collective hope that arises through solidarity in the pursuit of justice. I begin by reviewing recent literature on the nature of hope. I then explore the relationship between hope and solidarity to demonstrate the ways in which solidarity can give rise to hope. I suggest that the hope born of solidarity is collective when it is shared by at least some others, when it is caused or strengthened by activity in a collective action setting, and when the reciprocal hopeful expressions of individual group members result in an emotional atmosphere of hope that extends across the group. In the context of social movements, collective hope emerges alongside the collective intentions and actions of the solidarity group; namely, in the pursuit of a form of social justice that inspires the movement. I then suggest that the object of collective hope born of solidarity is the guiding ideal of justice and reflect on what it might mean to hope well for justice.

Attentional gaze dynamics in group interactions

ABSTRACT Group interactions influence human social and cognitive function. However, the non-verbal vehicles of that influence remain poorly understood. To address this question, here we present a taxonomy of interactive non-verbal attentional gaze behaviours – social referencing, participation, and mutual engagement – which we captured and characterized during live three-person interactions. Experiment 1 measured how each of these non-verbal indices predicted both the groups’ social dynamic (in terms of leadership perception) and later individual group member’s behaviour (in terms of gaze following magnitudes). The data indicated that the three attentional gaze behaviours (i) reliably reflected the groups’ nonverbal dynamics, (ii) predicted the groups’ social dynamics, and (iii) connected meaningfully with individual members’ behaviour. Experiment 2 confirmed that these group-to-individual links were dependent on individuals participating in a prior group interaction. Thus, our taxonomy of nonverbal attentional gaze behaviours characterizes both group and individual function well, and as such provides a methodological foundation for future investigations of non-verbal group dynamics and their links with individual behaviour.