Knowledge that Transforms

Childhood language interventions appear promising for improving children's lives and yielding economic returns. However, few studies have evaluated long-term effects of these interventions. Our study did this using a large, cluster-randomized trial of a preschool intervention for Norwegian children aged 4 to 5 years whose vocabulary was more limited than that of their peers. Results showed that effects on expressive language were maintained at the 7-month follow-up when the children were in first grade and that those with the weakest language skills initially had the largest and most persistent effects. However, 4 years after the intervention, the differences between the intervention and control groups were negligible. Thus, although effects from the preschool language intervention lasted into the first year of elementary school, effects eventually faded and were completely absent in fourth grade. Our findings suggest the need for a sustained approach to language and literacy support, focusing on persistent interventions and high-quality adapted instruction.

With more opportunities for diverse interactions, little is known about how social interactions involving people of different socioeconomic status (SES) may unfold. We investigated social-attunement patterns in dyadic interactions involving SES. Unacquainted adults recruited from a community in the United States interacted with similar-or-different-SES partners in the lab ( N = 130 dyads). Attunement was assessed throughout the interaction by examining physiological linkage —how much a person’s physiological change is predicted by another’s physiological change over time. Overall, low-SES participants showed stronger physiological linkage—indicating greater attunement—to partners across SES. Participants also appeared more comfortable when interacting with low-SES partners. There were no SES differences in dominance during the conversation. After the interaction, participants reported liking similar-SES partners more than different-SES partners. These patterns suggest that during interactions, lower-SES individuals are more other-focused than high-SES individuals, and in-group preference prevails. We note limitations in the racial representation of our sample.

The positive relation between mental health and educational attainment is well established, yet the extent to which cognitive abilities influence this gradient or independently predict mental health outcomes remains unclear. In this study, we investigated the association between adolescent cognitive abilities, educational attainment, and adult mental health. Cognitive ability was ascertained in Norwegian military conscript test data ( N = 272,351; mean age 17.8 years; males only), whereas mental disorders were ascertained using the Norwegian register of primary care diagnoses received between the age of 36–40. Higher cognitive abilities were associated with a monotonically decreasing risk of developing all the studied mental disorders except bipolar disorder. The association held even when comparing the cognitive abilities of brothers raised in the same family, attesting that cognitive ability and mental disorders are not associated because both arise from the same family background circumstances. Similarly, individuals with higher educational attainment had fewer mental health disorders. The association between low cognitive abilities and the risk of mental disorders was notably stronger in males with low educational attainment, compared to those with high educational attainment. These individuals may be an underutilized target group for mental-disorder prevention.

Recently, it has been demonstrated that taking a disagreeing perspective increases the accuracy of inner crowds by enhancing estimation diversity. An insightful commentary reanalyzed the data using maximal random structure models and found no increase in accuracy when taking a disagreeing perspective. These findings present a curious challenge for inner-crowd research and hint at the importance of question variability. Here, we present the results of three preregistered experiments (total N = 2,884, with online adult participants from the United States and the United Kingdom) that reconcile these findings by discerning between the ease and difficulty of questions. The results support the notion that taking a disagreeing perspective is beneficial for difficult questions, yet harmful for easier questions. We emphasize that question difficulty is a key factor to consider when evaluating the effectiveness of any intervention designed to improve the accuracy of aggregate estimates through the enhancement of diversity.

What are the risky choices people face in our complex and fast-changing world? This article reports on a series of population surveys in Switzerland ( N = 4,380) that collected those risky choices that are relevant in people’s everyday lives. Using this empirical basis, we developed an inventory consisting of 100 unique real-life choices to address open questions regarding the structure, life domains, and stability of the current ecology of risk. Moreover, a follow-up study ( N = 933) indicated some degree of generalizability of the construct of risk preference to the newly identified real-life choices. The five key insights that emerged from our analyses may be useful for researchers studying decision-making under risk and uncertainty (e.g., what criteria to use when developing novel measurement instruments) and policymaking in applied settings (e.g., addressing how swiftly the risks of modern life change).

Although over 8 million Native peoples live in the United States, American culture is infused with representations depicting them as people of the past (i.e., the Native-past stereotype). Four studies (total N = 38,009 non–Native American adults who voluntarily visited the Project Implicit website) examined the prevalence of the implicit Native-past stereotype among non–Native individuals and whether this stereotype predicted lower support for Native equity. We developed a Native-past Implicit Association Test to index the implicit Native-past stereotype and document the extent to which people associate Native peoples (vs. White Americans) with the past (vs. the present). Results showed that over two-thirds of non-Native participants demonstrated at least slight implicit Native-past associations (Cohen’s d s > 0.41). Moreover, stronger Native-past associations predicted greater minimization of contemporary Native racism and, subsequently, lower support for policies designed to advance Native equity. This work suggests that the prevalent Native-past stereotype may harm many aspects of contemporary Native peoples’ lived experiences.

Goal setting is only somewhat more common than the failure to follow through on one's goals. Recognizing the challenge of long-term behavior change, we asked what best predicts long-term goal adherence: extrinsic motivation (the extent to which goal pursuit is experienced as a means to an end) or intrinsic motivation (the extent to which the same goal pursuit is experienced as an end in itself). In a year-long longitudinal study, U.S. adults set extrinsic New Year's resolutions, but intrinsic motivation predicted adherence to these goals more than extrinsic motivation (Study 1). These findings emerged among adults in China (Study 2) and when measuring goal adherence objectively using the number of steps U.S. adults walked over 2 weeks (Study 3). Understanding how intrinsic motivation affects long-term persistence critically informs interventions that promote goal pursuit. Indeed, increasing intrinsic (vs. extrinsic) motivation increased U.S. adults' goal adherence (Study 4). Overall, intrinsic motivation both predicted and causally increased goal adherence.

Most mind-wandering paradigms use self-reports following task performance, but the extent to which these reports are confounded by performance cues is unknown. In two experiments with adult human participants, we examined whether self-reports and confidence therein are influenced by performance indicators during visual metronome response tasks. In Experiment 1 ( N = 40), sham feedback modulated reports independently of behavioral performance with participants more likely to report mind wandering after incorrect than correct sham feedback. In Experiment 2 ( N = 111), we replicated this pattern using a more implicit manipulation of perceived performance—a surreptitious delay in the onset of response targets. Participants were more likely to report mind wandering after this delay than they were in control trials. In both experiments, confidence in on-task reports was lower when the corresponding indicator (falsely) implied poor performance. These findings suggest that mind-wandering reports and experiential state confidence are partly confounded by performance monitoring and have implications for experience-sampling methodologies.

People often protect public goods by sanctioning free riders. This occurs in simple situations in which protecting the public good does not conflict with other moral considerations. How do people navigate situations in which protecting the public good comes at the expense of helping someone? We theorized that people would prioritize the needs of the public or another individual on the basis of the individual's group membership. To test this theory, we conducted a field experiment with male confederates approaching adult male travelers passing through check-in gates at Dutch train stations. The confederates requested to follow the travelers without checking in themselves. We observed whether travelers sanctioned the free rider by rejecting and disapproving of this request or helped by opening the gates. At three train stations, 801 travelers were approached by 10 different confederates. Group membership was varied by having five native-majority and five ethnic-minority confederates. Robust evidence was found for travelers being more likely to help native-majority free riders and to sanction ethnic-minority free riders.

Languages tend to describe “who is doing what to whom” by placing subjects before objects. This may reflect a bias for agents in event cognition: Agents capture more attention than patients in human adults and infants. We investigated whether this agent preference is shared with nonhuman animals. We presented Guinea baboons ( Papio papio; N = 13) with a change-detection paradigm on chasing animations. The baboons were trained to respond to a color change that was applied to either the chaser/agent or the chasee/patient. They were faster to detect a change to the chaser than to the chasee, which could not be explained by low-level features in our stimuli such as the chaser’s motion pattern or position. An agent preference may be an evolutionarily old mechanism that is shared between humans and other primates that could have become externalized in language as a tendency to place the subject first.