This manuscript examines how growing up with a sibling relates to prosociality and how knowledge of a partner’s sibling background may serve as a behavioral cue. In a series of experimental games, we found that individuals with siblings were significantly more likely to cooperate in stag hunt and contribute more in public goods and dictator games than only children (OC) on average. In two treatments where a sibling status cue is exogenously revealed, only-child pairs exhibited reduced prosociality. OC exhibit different empirical expectations of behavior compared to those with siblings, while generally sharing the same normative beliefs. Language AI analysis of subjects’ written perspectives on the games corroborates these patterns. We conclude that OC exhibit more context-dependent prosociality, with behavior more closely aligned with empirical expectations than normative beliefs, a pattern not observed in those with siblings.

This study examined how the location of silent pausing (mid- vs. end-clause) may relate to neural processes during spontaneous L1 and L2 speech production. Twenty intermediate-level Japanese speakers of L2 English carried out eight monologic, oral decision-making tasks, four in English and four in Japanese. While completing the tasks, their brain activity was recorded through fMRI scanning. Participants’ speech was transcribed, and the resulting transcripts were annotated for mid- and end-clause silent pauses. Then, for the pauses identified, we conducted whole-brain analyses to identify relevant activation patterns, followed by region-of-interest analyses in language-related areas. We found that mid-clause pauses were linked to increased activation in language-related brain regions, with stronger effects for L2 speech. We also observed heightened activity in conceptualisation-related brain areas at end-clause positions in both L1 and L2 speech. In L2 English, participants also displayed greater activation in a concept-retrieval-related brain region in end-clause than in mid-clause position.

This study examines the interaction between regularity and complexity in the acquisition of morphology and morpho-syntax in Hebrew nominal inflection. Seventy-eight Hebrew-speaking children, ages 4–8, were tested, using sentence completion tasks, on nine structures from three linguistic systems: singular adjectival agreement, noun pluralization, and plural adjectival agreement. Regularity and complexity emerged as organizing factors across ages: regular structures precede irregular ones, and within each level of regularity, less complex structures were acquired before more complex ones. The findings are discussed within the Dual-Route Model pointing to the difference between rule-governed and memory-based knowledge, while suggesting that the advantage of regularity could be attributed to frequency as well as to the strength of regularity cues in language acquisition, as proposed by Usage-Based models. The advantage of less complex structures over more complex ones is accounted for by the greater cognitive and linguistic effort required to acquire the latter.

We argue that it is both timely and critical to make a clearer distinction between destructive/toxic and incompetent leadership to advance research and better mitigate the problems with leadership quality. To achieve this, we first review and integrate the fragmented literature on the subject and specify what competent and effective leadership is. We then propose an operational definition of toxic leadership that is useful for practitioners to make a better distinction between toxic and incompetent leadership. We finally provide recommendations to avoid and deal with toxic leadership in organizations and discuss research directions.

We examined how first (L1) and second language (L2) English speakers interpret thematic roles when semantic cues conflict with syntactic cues in discourse contexts. We tested three groups: monolingual English speakers, Taiwanese Mandarin-speaking and Japanese-speaking L2 learners of English. Participants read written vignettes containing target sentences with by-phrases (e.g., Jerry was robbed by the thief). In these sentences, the embedded by-phrase noun was either semantically congruent or incongruent with the previous and subsequent discourse context. An offline comprehension task measured interpretations of the agent. Following predictions from the Competition Model and the Shallow Structure Hypothesis, we tested whether L2 speakers would rely more heavily on semantic cues as a general rule, or whether differences in how L1–L2 structures differ within and between participants would influence comprehension of the agents. Results from Bayesian multilevel regression models indicated that L2 speakers were more likely to choose agents based on semantic cues when compared to L1 speakers. No strong effects of L1–L2 cue similarity were obtained. Our results lend new support to the view that L2 speakers rely more heavily on discourse-level semantic cues than L1 speakers, highlighting the need for further research on cue competition in discourse contexts.

The gap between mental health conditions and care uptake remains a global challenge, despite the availability of effective and affordable treatments. This gap is driven by demand-side barriers, such as lack of mental health literacy (MHL), stigma, etc., that hinder help-seeking. In this systematic review, we critically appraise interventions aimed at promoting help-seeking for mental health conditions. The review protocol was prospectively registered with PROSPERO (registration number CRD42021273843). A systematic search was conducted across MEDLINE, PsycINFO, Embase, Global Health, Cumulative Index to Nursing and Allied Health Literature (CINAHL) and Cochrane Central Register of Controlled Trials (CENTRAL). Only RCTs published after 2016, testing interventions with the aim of improving help-seeking behaviors, intentions and attitudes for any mental health conditions, were included. Due to the heterogeneity of outcomes and measures used in the studies, a narrative synthesis was conducted to examine the evidence. Fifty-four studies met the inclusion criteria. Our review confirms that MHL or psychoeducation, motivational interviewing (MI) and social contact interventions effectively improve help-seeking attitudes (n = 10), intentions (n = 17) and behaviors (n = 16). Multi-component MHL and MI-based strategies enhance help-seeking behaviors, while social contact online interventions enhance intentions. MHL/psychoeducation was effective across all outcomes, particularly when combined with other strategies. Despite a rise in help-seeking research, many studies lacked standardized frameworks, making cross-intervention comparisons difficult. Future work should align with theoretical models of help-seeking and explore mechanisms of change to better understand the link between intentions, attitudes and behaviors.

The present study examined whether mothers’ pointing and the interaction between maternal pointing and infants’ point-following performance predict infants’ receptive and expressive vocabulary. At each month from 8 to 12, Turkish-speaking mother–infant dyads (N = 56) participated in the decorated room paradigm to determine pointing frequency and the point-following paradigm to determine whether infants follow points to surrounding pictures. Receptive and expressive vocabulary was measured at 14 and 18 months, respectively, using the Turkish CDI. Infants’ point-following performance at 11 months predicted their receptive vocabulary. Moreover, the interaction between maternal pointing and infant point-following at 12 months predicted receptive vocabulary, indicating that maternal pointing frequency predicted infants’ receptive vocabulary only for advanced point-followers, not for visual-field point-followers. We found no significant association between maternal pointing or infants’ point-following performance with expressive vocabulary. These findings suggest that infants’ point-following performance plays a role in their early word learning during mother–infant interactions.

Theorists conceptualize reactive aggression as emotional (especially angry) and proactive aggression as unemotional (although it is unclear whether relations between proactive aggression and emotion are null or negative). Goals of the current study were to: (a) examine links between reactive aggression and a range of emotions (happiness, sadness, anger, and anxiety), and (b) include neutral emotion to address whether proactive aggression is unrelated or negatively related to emotion. To assess emotion, playgroups of four same-sex, unfamiliar, nine-year-old children (N = 158; 52.5% males; racially/ethnically diverse) interacted as round-robin dyads while completing challenging and cooperative tasks; observers coded emotions second-by-second. To assess both behavioral and observational reactive-versus-proactive aggression, children completed video games with virtual peers. Reactive aggression was positively related to happiness, anger, and anxiety and negatively related to neutral emotion, for at least one task and one aggression measure. Proactive aggression was positively related to neutral emotion but negatively related to happiness, for both tasks and aggression measures. Findings enhance theoretical understanding of: (a) reactive aggression as broadly emotional by relating it to happiness and anxiety as well as anger, and (b) proactive aggression as unemotional by linking it to the display of neutral emotion and the lack of display of happiness.

Mental health conditions, including anxiety disorders, are a major cause of morbidity across Sub-Saharan Africa. There are scarce mental health resources and providers in Madagascar, which substantiates a need for clear and accessible assessment tools for assessing mental health conditions. Yet, before this study, there were no validated scales to measure anxiety disorder symptoms in Madagascar. We assessed the psychometric properties of the culturally adapted 10-item Hopkins Symptom Checklist (HSCL-10-SW) anxiety subscale in the Bay of Ranobe region, in southwestern Madagascar. The study participants were part of the ongoing HIARA cohort study. The HSCL-10-SW includes the original HSCL-10 anxiety subscale in addition to three culturally relevant items that were derived through qualitative research: irritability, lost in thoughts/overthinking and forgetfulness. We administered the HSCL-10-SW to 809 participants (41.2% males) aged 16 years (mean age 36.9) and above in October 2023. Our exploratory factor analysis supported a two-factor structure: Fear Anxiety and Cognitive-Somatic Anxiety. We found discriminant validity between Fear anxiety and Depression factors. Although the HSCL-10-SW demonstrated acceptable psychometric validity, we suggest that additional qualitative studies should be conducted to explore the local conceptualization of anxiety disorders in southwestern Madagascar.