In pure coordination games players aim to give the same response without communication. Cognitive science research has focused on the reasoning and common knowledge necessary as the background conditions for coordination, with less attention paid to the challenge of intuiting responses on which coordination might be possible. Most studies have examined coordination within university samples from a single country and so the extent of the challenge of coordinating between heterogenous groups of people may have been underestimated. We conducted three empirical studies (two pre-registered) with participants from the UK, South Africa, and Chile, plus a globally distributed sample (total N=520). Without communicating, participants were asked to coordinate on answers to simple questions such as “name a city”. All groups coordinated at rates far above chance, but often coordinated on different responses. Study 1 showed that participants from one group could nevertheless anticipate the responses of another group, while Studies 2 and 3 showed that participants could coordinate with a partner from a different group. Crucially, between-group partners most often coordinated on new responses that were rarely considered for within-group coordination, providing the strongest evidence to date to support Schelling’s claim that coordination requires distinctive reasoning, beyond primary and secondary salience. These findings provide evidence that coordination decisions are variable and flexible, resulting in accurate adaptations to achieve coordination. Where previous work has focussed predominantly on the forms of reasoning that support coordination, the present findings suggest that it is equally important to examine the content of coordination solutions.

Reality monitoring is the ability to remember whether information was internally- or externally-generated and is often impaired in clinical populations. Though an altered sense of reality characterizes both dissociation and psychosis, no review has compared reality monitoring between them. This paper compares these fields to inform the relation between dissociation and psychosis and the role of reality monitoring in mental health. First, a systematic review identified four eligible high-quality papers (according to Kmet and Lee's Quantitative Checklist; n = 482) which measured dissociation directly and tested reality monitoring experimentally. Meta-analysis indicated a small significant negative association between reality monitoring and dissociation (Correlation = -0.013, [-0.22, -0.04]), implying reality monitoring impairment in dissociation. Papers were identified from inception to May 15, 2025 through searching Web of Science, Scopus, PsycINFO, PsycARTICLES, EMBASE, and MEDLINE. Next, a narrative review of psychosis and reality monitoring, covering pre-existing systematic reviews and original articles, indicated variation across the clinical spectrum. While clinical psychosis was robustly associated with impaired reality monitoring ability and externalising bias, results at non-clinical and sub-clinical levels were mixed. Finally, the reviews were compared to understand how reality monitoring and research practices vary across dissociation and psychosis. This indicated that both dissociation and psychosis are associated with impaired reality monitoring. Though this suggests a shared cognitive basis, no papers on dissociation included clinical presentations or bias towards internalising/externalising the item's source, meaning any comparison is incomplete. Future research should consider clinical dissociation, reality monitoring bias in dissociation, and compare dissociation and psychosis directly.

In this chapter, we will summarize recent empirical results highlighting how different groups of people solve pure coordination games. Such games are traditionally studied in behavioural economics, where two people need to coordinate without communicating with each other. Our results suggest that coordination choices vary across groups of people, and that people can adapt flexibly to these differences in order to coordinate between groups. We propose that pure coordination games are a useful empirical platform for studying aspects of mindshaping. Drawing on existing psychological literature on alignment during interactions, we suggest that experience of successful interaction leads people to develop aligned intuitions about what is relevant and appropriate that support coordination when interaction and communication is not possible. Consistent with arguments made in the literature on mindshaping we believe that such alignment is more important for coordination than mindreading inferences about mental states, and indeed that mindreading is instead a form of coordination behaviour that is dependent upon intuitive alignment.

A rigorous psychometric approach is crucial for the accurate measurement of mind-reading abilities. Traditional scoring methods for such tests, which involve lengthy free-text responses, require considerable time and human effort. This study investigates the use of large language models (LLMs) to automate the scoring of psychometric tests. Data were collected from participants aged 13 to 30 years and scored by trained human coders to establish a benchmark. We evaluated multiple LLMs against human assessments, exploring various prompting strategies to optimize performance and fine-tuning the models using a subset of the collected data to enhance accuracy. Our results demonstrate that LLMs can assess advanced mind-reading abilities with over 90% accuracy on average. Notably, in most test items, the LLMs achieved higher Kappa agreement with the lead coder than two trained human coders, highlighting their potential to reliably score open-response psychometric tests.

The high occurrence of social content in children's fiction may provide opportunities for practicing and refining emerging understanding of others' thoughts, feelings, and desires, referred to as "theory of mind" (ToM). The aim of the present study was to test this potential developmental benefit by longitudinally examining ToM development in middle childhood and adolescence, as well as examining associations between children's reading experience and ToM. Reading experience and ToM were assessed in 234 children at five time points between ages 12.5 and 16 (56% girls). Of this sample, 16% of children were eligible for free school meals, and 9% spoke English as additional language. To examine longitudinal associations between ToM and reading experience, we tested development and stability over time and tested cross-lagged associations between these constructs. Results showed that there was meaningful improvement in ToM in this age range, but no significant variance in growth trajectories. Our data also showed rank-order stability in individual differences in ToM, suggesting that variation in theory-of-mind performance is genuine. There were bidirectional associations between ToM and reading experience, but these effects disappeared after controlling for verbal ability, gender, and parent education. Future research should include more direct tests of potential underlying mechanisms of the benefits of narrative exposure for our understanding of others. (PsycInfo Database Record (c) 2025 APA, all rights reserved).

The Birmingham Advanced Mindreading Stories (BAMS) test was developed and subject to psychometric evaluation as a new measure of social understanding. Narrative stimuli were co-produced with demographically diverse young people. Adolescent participants (aged 13-17 years) were tested in schools and adult participants (aged 18-34 years) were tested online. Study 1 (N=300) identified stories that could be coded reliably, that were sensitive to varying performance and that measured the same underlying “mindreading” factor. Study 2 (N=2612) collected data at three time points over 9 months. Confirmatory factor analysis and structural equation modelling provided evidence that the BAMS was sensitive, reliable, valid, and fair. Using the same data set, Study 3 showed that similarity of participants and authors influenced performance on the BAMS. Individual differences in social understanding corresponded to variation in the flexibility with which participants could mindread a diversity of people and situations.

Early learning of a second language at home has been found to be beneficial for children’s cognitive development, including their ability to ascribe mental states to others. We investigated whether second language learning in an educational setting can accelerate children’s sensitivity to a communication partner’s perspective and whether the amount of exposure to second language education makes a difference. We tested three groups of English monolingual four-five year old children with varying language exposure at the beginning of their first year at primary school and 24 weeks later. Children attending bilingual schools and children with weekly second language lessons exhibited similar accelerated development of communicative perspective-taking skills compared to children without second language provision. Such advances were not related to other cognitive advances. Thus, limited foreign language teaching might boost young children’s development in communicative perspective-taking skills, providing an enhanced basis for their social competence development.

In pure coordination games players seek to coordinate responses with one another without communicating. Without a logically correct response, success depends upon players intuiting a response that is mutually obvious. Previous work suggests that such coordination requires a distinctive form of “group” thinking and sufficient mutual knowledge, but reveals little about the basis for the intuitive judgements themselves. Here, that question was addressed for the first time by examining the basis of coordination performance of groups whose intuitions might plausibly differ: children versus adults. Twenty-five 5-year-olds, 30 7-year-olds, and 25 adults undertook four types of coordination game, and novel metrics allowed “intuitive alignment” in responses to be evaluated within- and between-groups. All groups performed above chance, and adults showed higher levels of alignment than children, but adults and children showed different patterns in their intuitions. Implications for intergenerational understanding and mis-understanding are discussed.

What would a theory of visuospatial perspective taking (VSPT) look like? Here, ten researchers in the field, many with different theoretical viewpoints and empirical approaches, present their consensus on the three big questions we need to answer in order to bring this theory (or these theories) closer.

Existing methods for studying individual differences in adults’ mindreading often lack good psychometric characteristics. Moreover, it remains unclear, even in theory, how mindreading varies in adults who already possess an understanding of mental states. In this pre-registered study, it was hypothesised that adults vary in their motivation for mindreading and in the degree to which their answers on mindreading tasks are appropriate (context-sensitive). These factors are confounded in existing measures as they do not differentiate between the frequency of mental state terms (MST), indicative of motivation, and the quality of an explanation. Using an innovative scoring system, the current study examined whether individual differences in adult undergraduate psychology students’ (N = 128) answer quality and / or quantity of explicit references to others’ mental states on two open-ended response mindreading tasks were separable constructs, accounted for by mindreading motivation, and related differentially to measures previously linked with mindreading (e.g., religiosity, loneliness, social network size). A two-factor and one-factor model both provided acceptable fit. Neither model showed significant associations with mindreading motivation. However, a two-factor model (with MST and response appropriateness loading onto separate factors) provided greater explanatory power. Specifically, MST was positively associated with religiosity and response appropriateness was negatively associated with religiosity, whilst the one-factor solution did not predict any socially relevant outcomes. This provides some indication that mindreading quantity and mindreading quality may be distinguishable constructs in the structure of individual differences in mindreading.

Can exposure to a foreign language in the first year of school enhance divergent thinking skills? Ninety-nine monolingual children from predominantly White neighbourhoods (M-Age = 57.7 months, SD 1.2; 47 girls) attending bilingual schools, schools with weekly foreign language lessons, or schools without a foreign language provision (= controls) completed divergent thinking and executive function tasks at the beginning of the school year and 24 weeks later. The groups did not differ on creativity measures at the beginning of the school year. Only bilingual school children and weekly language learners improved divergent thinking at the second testing point, with the former significantly outperforming controls on creative fluency and flexibility. Improvements could not be explained by executive function development. Therefore, a considerable amount of exposure to a foreign language in early formal education appears to boost creative thinking.

The terminology used in discussions on mental state attribution is extensive and lacks consistency. In the current paper, experts from various disciplines collaborate to introduce a shared set of concepts and make recommendations regarding future use.

Abstract Background The concept of neurodiversity draws upon scientific research, and lessons from practice and lived experience to suggest new ways of thinking about neurodevelopmental conditions. Among the formative observations are that characteristics associated with neurodevelopmental conditions are part of a “broader phenotype” of variation across the whole population, and that there appear to be “transdiagnostic” similarities as well as differences in these characteristics. These observations raise important questions that have implications for understanding diversity in neurodevelopmental conditions and in neurocognitive phenotypes across the whole population. Method The present work examines broader phenotypes using seven widely used self‐report assessments of traits associated with autism, ADHD, dyslexia, Developmental Coordination Disorder/dyspraxia, tic disorders/Tourette's, cortical hyperexcitability associated with subclinical epilepsy, and sensory sensitivities. A representative sample of 995 adults (aged 17–77) in the UK completed self‐report measures of neurodiversity, wellbeing, generalized anxiety, and depression, and cognitive abilities (nonverbal intelligence and executive functioning). Results We used confirmatory factor analysis to test whether variation and covariation was better characterized (1) by traditional diagnostic labels, or (2) transdiagnostically according to similarities in functions, behaviours, or phenomena. Results indicated that neurodiversity characteristics were best explained using a bifactor model with one general “N” factor and four condition‐specific factors. Conclusion This was the largest examination to date of the factor structure of broader phenotypes relevant to neurodevelopmental conditions. It provides critical benchmark data, and a framework approach for asking systematic questions about the structure of neurocognitive diversities seen in the whole population and in people with one or more diagnoses.

Successful communication requires speakers and listeners to refer to information in their common ground. Shared history is one of the bases for common ground, as information from a communicative episode in the past can be referred to in future communication. However, to draw upon shared history, communicative partners need to have an accurate memory record that they can refer to. The memory mechanism for shared history is poorly understood. The current study investigated the ways in which memory for shared history is prioritised. Two experiments presented a referential communication task followed by a surprise recognition memory task, with the former task serving as an episode of shared history. Experiment 1 revealed superior memory for information that was both seen in the communicators' common ground and referred to, followed by information that was seen but not referred to, and finally by information privileged to the participants. Experiment 2 provided a replication of Experiment 1 and further demonstrated that these co-presence effects are not dependent on the presence of a speaker with a different perspective to the participant.

We investigated the relationship between Theory of Mind (ToM) and communicative cooperation. Specifically, we examined whether communicative cooperation is affected by the ToM ability of one's cooperative partner as well as their own. ToM is the attribution of mental states to oneself and others; cooperation is the joint action that leads to achieving a shared goal. We measured cooperation using a novel communicative cooperation game completed by participants in pairs. ToM was measured via the Movies for Assessment of Social Cognition (MASC) task and fluid intelligence via the Raven task. Findings of 350 adults show that ToM scores of both players were predictors of cooperative failure, whereas Raven scores were not. Furthermore, participants were split into low- and high-ToM groups through a median split of the MASC scores: high-ToM individuals committed significantly fewer cooperative errors compared to their low-ToM counterparts. Therefore, we found a direct relationship between ToM and cooperation. Interestingly, we also examined how ToM scores of paired participants determine cooperation. We found that pairs with two high-ToM individuals committed significantly fewer errors compared to pairs with two low-ToM individuals. We speculate that reduced cooperation in low-low ToM pairs is a result of less efficient development of conceptual alignment and recovery from misalignment, compared to high-high ToM dyads. For the first time, we thus demonstrate that it is not all about you; both cooperative partners make key, independent, contributions to cooperative outcomes. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

The ability to mindread recursively-for example, by thinking what person 1 thinks person 2 thinks person 3 thinks-is a prime example of recursive thinking in which one process, representation, or idea becomes embedded within a similar one. It has also been suggested that mindreading is an exceptional example, with five recursive steps commonly observed for mindreading, in comparison with just one or two in other domains. However, conceptual analysis of existing recursive mindreading tasks suggests that conclusions about exceptional mindreading are insecure. Revised tasks were devised to provide a more rigorous test of recursive mindreading capacity. Study 1 (N = 76) found significantly worse performance at level-5 recursive mindreading on the revised tasks (17% correct) compared with the original tasks (80% correct), and no effect of moderate financial bonuses for good performance. Study 2 (N = 74) replicated poor performance at level-5 recursive mindreading on the revised tasks (15% correct) in the absence of bonuses, but found better performance (45% correct) when participants were offered large bonuses for accuracy, encouraged to take as much time as needed, and assisted with a strategy for recursive reasoning. These findings suggest that, like recursive thinking in other domains, recursive mindreading is effortful and limited. We discuss how the proposed role for high levels of recursive mindreading in communication, culture, and literature might be reconciled with these limitations. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Theory of mind (ToM), the ability to understand and reason about mental states, has been extensively studied in young children and clinical populations. A growing interest in examining ToM in adults has emerged over the past two decades, but the extent to which existing measures are suitable for studying adults, especially in detecting individual differences, remains understudied. In this systematic review of 273 studies, 75 measures used to investigate individual differences in adults' ToM were identified. Their sensitivity to individual differences, reliability, and validity were examined. Results suggest that ceiling effects were prevalent, and there was limited evidence to establish the reliability or validity of these measures due to the lack of reports of psychometric properties. Interrelations among measures were inconsistent. These findings highlight the need for future empirical and theoretical work to broaden the evidence base regarding psychometric properties of measures, to develop new measures, and to lay out more specific hypotheses about the relevance of ToM for different social outcomes.

Neurodevelopmental conditions show considerable phenotypic variability, and high rates of co-diagnosis. 995 adults from the UK completed self-report broader phenotype measures for six neurodevelopmental conditions. We found that a single “N-factor” accounted for the most overall variance on all measures, whilst four further factors accounted for additional unique variance in traits associated with autism, ADHD, cortical hyperexcitability, and dyslexia/DCD.This N+4 factor structure suggests that broader phenotype scales measure both general “neurodiversity” plus variability in traits that are more condition specific; distinguishing these sources of variance may be helpful when exploring the wide variety of experiences and needs of people with a neurodevelopmental diagnosis.

Functional impairment is a core feature of both autism and schizophrenia spectrum disorders. While diagnostically independent, they can co-occur in the same individual at both the trait and diagnostic levels. The effect of such co-occurrence is hypothesized to worsen functional impairment. The diametric model, however, suggests that the disorders are etiologically and phenotypically diametrical, representing the extreme of a unidimensional continuum of cognition and behavior. A central prediction of this model is that functional impairment would be attenuated in individuals with mixed symptom expressions or genetic liability to both disorders. We tested this hypothesis in two clinical populations and one healthy population. In individuals with chronic schizophrenia and in individuals with first episode psychosis we evaluated the combined effect of autistic traits and positive psychotic symptoms on psychosocial functioning. In healthy carriers of alleles of copy number variants (CNVs) that confer risk for both autism and schizophrenia, we also evaluated whether variation in psychosocial functioning depended on the combined risk conferred by each CNV. Relative to individuals with biased symptom/CNV risk profiles, results show that functional impairments are attenuated in individuals with relatively equal levels of positive symptoms and autistic traits-and specifically stereotypic behaviors-, and in carriers of CNVs with relatively equal risks for either disorder. However, the pattern of effects along the "balance axis" varied across the groups, with this attenuation being generally less pronounced in individuals with high-high symptom/risk profile in the schizophrenia and CNV groups, and relatively similar for low-low and high-high individuals in the first episode psychosis group. Lower levels of functional impairments in individuals with "balanced" symptom profile or genetic risks would suggest compensation across mechanisms associated with autism and schizophrenia. CNVs that confer equal risks for both disorders may provide an entry point for investigations into such compensatory mechanisms. The co-assessment of autism and schizophrenia may contribute to personalized prognosis and stratification strategies.