This study presents a meta-analysis of the relation between language and mathematics. A moderate relation between language and mathematics was found in 344 studies with 393 independent samples and more than 360,000 participants, r = .42, 95% CI [.40, .44]. Moderation and partial correlation analyses revealed the following: (a) more complicated language and mathematics skills were associated with stronger relations between language and mathematics; after partialing out working memory and intelligence, rapid automatized naming showed the strongest relation to numerical knowledge; (b) the relation between language and mathematics was stronger among native language speakers than among second-language learners, but this difference was not found after partialing out working memory and intelligence; (c) working memory and intelligence together explained over 50% of the variance in the relation between language and mathematics and explained more variance in such relations involving complex mathematics skills; (d) language and mathematics predicted the development of one another even after controlling for initial performance. These findings suggest that we may use language as a medium to communicate, represent, and retrieve mathematics knowledge as well as to facilitate working memory and reasoning during mathematics performance and learning. With development, the use of language to retrieve mathematics knowledge may be more important for foundational mathematics skills, which in turn further strengthens linguistic thought processes for performing more advanced mathematics tasks. Such use of language may boost the mutual effects of cognition and mathematics across development.

This paper describes methodological findings from research to recruit and research hard-to-reach socially excluded people. We review the ways in which researchers have used particular strategies to access hard-to-reach individuals and groups and note that little attention has been given to understanding the implications of the nature of the trust relationship between researcher and participant. Gatekeepers invariably play a role in accessing socially excluded people in research, yet discussion to date invariably focuses on the instrumental role gatekeepers play in facilitating researchers’ access. In this paper we explore the possibilities for analysing relationships in terms of trust and distrust between gatekeeper and socially excluded participant. Our analysis considers the different kinds of relationships that exist between gatekeepers and socially excluded people and, in particular, the relationships of power between gatekeepers and socially excluded people. Insights into the nature of trust among socially excluded people will also be considered. Finally, we discuss how size and use of social networks among socially excluded groups and perceptions of risk in interactions with gatekeepers are important to understanding the possibilities for trustful relationships, and for meaningful and successful access for researchers to socially excluded individuals and groups.

A scientific community can be modeled as a collection of epistemic agents attempting to answer questions, in part by communicating about their hypotheses and results. We can treat the pathways of scientific communication as a network. When we do, it becomes clear that the interaction between the structure of the network and the nature of the question under investigation affects epistemic desiderata, including accuracy and speed to community consensus. Here we build on previous work, both our own and others’, in order to get a firmer grasp on precisely which features of scientific communities interact with which features of scientific questions in order to influence epistemic outcomes. Here we introduce a measure on the landscape meant to capture some aspects of the difficulty of answering an empirical question. We then investigate both how different communication networks affect whether the community finds the best answer and the time it takes for the community to reach consensus on an answer. We measure these two epistemic desiderata on a continuum of networks sampled from the Watts-Strogatz spectrum. It turns out that finding the best answer and reaching consensus exhibit radically different patterns. The time it takes for a community to reach a consensus in these models roughly tracks mean path length in the network. Whether a scientific community finds the best answer, on the other hand, tracks neither mean path length nor clustering coefficient.

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Objectives: Residential time in the United States appears to be a risk factor for mental health problems among Latinos, according to studies of the immigrant paradox, or a pattern of findings documenting better health for immigrants relative to U.S.-born Latinos. The present study used an acculturative stress model to examine the immigrant paradox with a sample of Mexican-origin mothers. Method: Mothers [N ϭ 175; age ϭ 33.52 (10.75)], who were foreign-or U.S.-born, were categorized as more acculturated or less acculturated based on cluster analyses using demographic and language proficiency variables. The association between acculturative status and depressive symptoms approximately 9 months later was tested with two models: with both cultural stressors (i.e., perceived discrimination, acculturative stress) and cultural assets (i.e., familismo, ethnic identity) as mediators, and with the effects of cultural stressors moderated by cultural assets. Results: Data provide some support for the validity of the mediation model. Less acculturated mothers reported (a) a stronger ethnic identity, which appears to have protected them from later depression, and (b) stronger familismo, which increased risk for later depression. In addition, discrimination was negatively related to later depression. Conclusions: We found support for the mediating role of cultural assets in the link between acculturation and depression, but some associations were in unexpected directions. These findings highlight the complexities of preserving core cultural characteristics among Mexican-origin mothers living in the United States, and the need to consider the context in which cultural processes unfold.