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Social interactions are a significant factor that influence the decision-making of species ranging from humans to bacteria. In the context of animal migration, social interactions may lead to improved decision-making, greater ability to respond to environmental cues, and the cultural transmission of optimal routes. Despite their significance, the precise nature of social interactions in migrating species remains largely unknown. Here we deploy unmanned aerial systems to collect aerial footage of caribou as they undertake their migration from Victoria Island to mainland Canada. Through a Bayesian analysis of trajectories we reveal the fine-scale interaction rules of migrating caribou and show they are attracted to one another and copy directional choices of neighbours, but do not interact through clearly defined metric or topological interaction ranges. By explicitly considering the role of social information on movement decisions we construct a map of near neighbour influence that quantifies the nature of information flow in these herds. These results will inform more realistic, mechanism-based models of migration in caribou and other social ungulates, leading to better predictions of spatial use patterns and responses to changing environmental conditions. Moreover, we anticipate that the protocol we developed here will be broadly applicable to study social behaviour in a wide range of migratory and non-migratory taxa. This article is part of the theme issue ‘Collective movement ecology’.

'A clarion voice from a new generation of British feminists ... I was gripped' - Sophie Lewis, author of Abolish the FamilyCapitalist ideology wants us to believe that there is an optimal way to live. 'Making connections' means networking for work. Our emotional needs are to be fulfilled by a single romantic partner, and self-care equates to taking personal responsibility for our suffering. We must be productive and heterosexual, we must have babies and buy a house. But the kicker is most people cannot and do not want to achieve these goals. Instead we are left feeling atomised, exhausted and disempowered.Radical Intimacy shows that it doesn't need to be this way. Including inspiring ideas for alternative ways to live, Sophie K Rosa demands we use our radical imagination to discover a new form of intimacy.Including critiques of the 'wellness' industry that ignores rising poverty rates, the mental health crisis and racist and misogynist state violence; transcending love and sex under capitalism to move towards feminist, decolonial and queer thinking; asking whether we should abolish the family; interrogating the framing of ageing and death and much more, Radical Intimacy is the compassionate antidote to a callous society.Now as an audiobook, to listen to on the go.

Predation is thought to shape the macroscopic properties of animal groups, making moving groups more cohesive and coordinated. Precisely how predation has shaped individuals' fine-scale social interactions in natural populations, however, is unknown. Using high-resolution tracking data of shoaling fish (Poecilia reticulata) from populations differing in natural predation pressure, we show how predation adapts individuals' social interaction rules. Fish originating from high predation environments formed larger, more cohesive, but not more polarized groups than fish from low predation environments. Using a new approach to detect the discrete points in time when individuals decide to update their movements based on the available social cues, we determine how these collective properties emerge from individuals' microscopic social interactions. We first confirm predictions that predation shapes the attraction–repulsion dynamic of these fish, reducing the critical distance at which neighbours move apart, or come back together. While we find strong evidence that fish align with their near neighbours, we do not find that predation shapes the strength or likelihood of these alignment tendencies. We also find that predation sharpens individuals' acceleration and deceleration responses, implying key perceptual and energetic differences associated with how individuals move in different predation regimes. Our results reveal how predation can shape the social interactions of individuals in groups, ultimately driving differences in groups' collective behaviour.

Do women participate in and influence meetings equally with men? Does gender shape how a meeting is run and whose voices are heard?The Silent Sexshows how the gender composition and rules of a deliberative body dramatically affect who speaks, how the group interacts, the kinds of issues the group takes up, whose voices prevail, and what the group ultimately decides. It argues that efforts to improve the representation of women will fall short unless they address institutional rules that impede women's voices. Using groundbreaking experimental research supplemented with analysis of school boards, Christopher Karpowitz and Tali Mendelberg demonstrate how the effects of rules depend on women's numbers, so that small numbers are not fatal with a consensus process, but consensus is not always beneficial when there are large numbers of women. Men and women enter deliberative settings facing different expectations about their influence and authority. Karpowitz and Mendelberg reveal how the wrong institutional rules can exacerbate women's deficit of authority while the right rules can close it, and, in the process, establish more cooperative norms of group behavior and more generous policies for the disadvantaged. Rules and numbers have far-reaching implications for the representation of women and their interests. Bringing clarity and insight to one of today's most contentious debates,The Silent Sexprovides important new findings on ways to bring women's voices into the conversation on matters of common concern.

Can men and women have equal levels of voice and authority in deliberation or does deliberation exacerbate gender inequality? Does increasing women's descriptive representation in deliberation increase their voice and authority? We answer these questions and move beyond the debate by hypothesizing that the group's gender composition interacts with its decision rule to exacerbate or erase the inequalities. We test this hypothesis and various alternatives, using experimental data with many groups and links between individuals’ attitudes and speech. We find a substantial gender gap in voice and authority, but as hypothesized, it disappears under unanimous rule and few women, or under majority rule and many women. Deliberative design can avoid inequality by fitting institutional procedure to the social context of the situation.

Both conversation-analytic and ethnographic studies of interaction tend to isolate situated conduct from the full biographical context that is meaningful to actors. This article argues that there are good analytic reasons to recover some of that biographical context by incorporating character-driven ethnographic representation within interactionist research. I make this case in reference to a rule dispute captured on video during an ethnography of a public park basketball game. Through a biographically contextualized analysis of players’ situated conduct, I show how character representation allows unspoken threads of actors’ lives to become analytic resources. Incorporating biographical context also opens a methodological path for interactionists to leverage the close-up study of situated encounters for empirical claims about broader forms of social organization. In this case, I argue that character-driven representation allows for an analysis that identifies rule disputes as an interactional mechanism of socially integrative park use.

I present a brief review of problems in the sociological study of culture, followed by an integrated, interdisciplinary view of culture that eschews extreme contextualism and other orthodoxies. Culture is defined as the conjugate product of two reciprocal, componential processes. The first is a dynamically stable process of collectively made, reproduced, and unevenly shared knowledge structures that are informational and meaningful, internally embodied, and externally represented and that provide predictability, coordination equilibria, continuity, and meaning in human actions and interactions. The second is a pragmatic component of culture that grounds the first, and it has its own rules of usage and a pragmatically derived structure of practical knowledge. I also offer an account of change and draw on knowledge activation theory in exploring the microdynamics of cultural practice and propose the concept of cultural configuration as a better way of studying cultural practice in highly heterogeneous modern societies where people shift between multiple, overlapping configurations.

Social interactions between animals can provide many benefits, including the ability to gain useful environmental information through social learning. However, these social contacts can also facilitate the transmission of infectious diseases through a population. Animals engaging in social interactions therefore face a trade-off between the potential informational benefits and the risk of acquiring disease. Theoretical models have suggested that modular social networks, associated with the formation of groups or sub-groups, can slow spread of infection by trapping it within particular groups. However, these social structures will not necessarily impact the spread of information in the same way if its transmission follows a “complex contagion”, e.g. through individuals disproportionally copying the majority (conformist learning). Here we use simulation models to demonstrate that modular networks can promote the spread of information relative to the spread of infection, but only when the network is fragmented and group sizes are small. We show that the difference in transmission between information and disease is maximised for more well-connected social networks when the likelihood of transmission is intermediate. Our results have important implications for understanding the selective pressures operating on the social structure of animal societies, revealing that highly fragmented networks such as those formed in fission–fusion social groups and multilevel societies can be effective in modulating the infection-information trade-off for individuals within them.

This article contributes to the geographical understanding of how mobile online presence enabled by smartphones transforms human spatial practices; that is, people's everyday routines and experiences in time and space. Contrasting a mainstream discourse concentrating on the autonomy and flexibility of ubiquitous (anywhere, anytime) use of social media, we examine new and mounting constraints on user agency. Building on time-geographic theory, we advance novel insights into the virtualities of young people's social lives and how they are materialized in the physical world. Critically, we rework the classical time-geographic conceptions of bundling, constraints, rhythms, and pockets of local order; draw on the emerging literature on smartphone usage; and use illustrative examples from interviews with young people. We suggest a set of general and profound changes in everyday life and sociality due to pervasive and perpetual mediated presence of friends: (1) the emergence of new coupling constraints and the recoupling of social interaction; (2) the changing rhythms of social interaction due to mediated bundles of sociality becoming more frequent and insistent; (3) the shifting nature of the streaming background of online contacts, which are becoming more active, intervening in, and intruding on ongoing foreground activities of everyday life; and (4) the reordering of foreground activity as well as colocated and mediated presences, centering on processes of interweaving, congestion and ambivalence, and colocated absence. Key Words: intervening background, local and mediated pockets of order, online copresence, rhythm, spatial practice.

The success and widespread deployment of artificial intelligence (AI) have raised awareness of the technology’s economic, social, and political consequences. Each new step in the development and application of AI is accompanied by speculations about a supposedly imminent but largely fictional artificial general intelligence (AGI) with (super-)human capacities, as seen in the unfolding discourse about capabilities and impact of large language models (LLMs) in the wake of ChatGPT. These far-reaching expectations lead to a discussion on the societal and political impact of AI that is largely dominated by unfocused fears and enthusiasms. In contrast, this article provides a framework for a more focused and productive analysis and discussion of AI’s likely impact on one specific social field: democracy. First, it is necessary to be clear about the workings of AI. This means differentiating between what is at present a largely imaginary AGI and narrow artificial intelligence focused on solving specific tasks. This distinction allows for a critical discussion of how AI affects different aspects of democracy, including its effects on the conditions of self-rule and people’s opportunities to exercise it, equality, the institution of elections, and competition between democratic and autocratic systems of government. This article shows that the consequences of today’s AI are more specific for democracy than broad speculation about AGI capabilities implies. Focusing on these specific aspects will account for actual threats and opportunities and thus allow for better monitoring of AI’s impact on democracy in an interdisciplinary effort by computer and social scientists.