Factor structure of the alcohol expectancies questionnaire among adolescents in rural Ghana.

INTRODUCTION: Children's early experiences with alcohol inform the development of alcohol-related beliefs which are known to predict alcohol consumption during the critical stage of adolescence. Yet, there has been considerably less research into these alcohol-related cognitions in low- and middle-income countries (LMIC) and existing measures of these beliefs are highly reflective of Western contexts, which may not be fully appropriate for use in LMICs. The aim is to ascertain the construct validity of the Alcohol Expectancies Questionnaire (AEQ) in a non-Western sample. METHODS: A cross-sectional diagnostic accuracy study involving 500 adolescents aged 10 to 18 years randomly selected from the database of the Navrongo Health and Demographic Surveillance System. Participants were administered the locally back translated version of the 34-item AEQ. Confirmatory factor analysis using the lavaan package in R was conducted to generate indices for the factor structure of the AEQ. RESULTS: Confirmatory factor analyses showed that while groupings of positive and negative expectancies were similar to those observed when expectancies have been assessed previously in Western studies, these formed a single 'alcohol expectancy' factor. Questions relating to positive tension reduction and negative physical expectancies showed inconsistent responses in this study. DISCUSSION AND CONCLUSIONS: Commonly used tools for the assessment of alcohol expectancies may not be suitable for use in Ghana, possibly owing to their development and validation in Western contexts. These findings have implications for the assessment of alcohol-related beliefs in LMIC settings and begin to map out a research agenda to develop more contextually and culturally attune alcohol assessments.

Catching a smile from individuals and crowds: Evidence for distinct emotional contagion processes.

Research examining how crowd emotions impact observers usually requires participants to engage in an atypical mental process whereby (static) arrays of individuals are cognitively integrated to represent a crowd. The present work sought to extend our understanding of how crowd emotions may spread to individuals by assessing self-reported emotions, attention and muscle movement in response to emotions of dynamic, virtually modeled crowd stimuli. Self-reported emotions and attention from thirty-six participants were assessed when foreground and background crowd characters exhibited homogeneous (Study 1) or heterogeneous (Study 2) positive, neutral, or negative emotions. Results suggested that affective responses in observers are shaped by crowd emotions even in the absence of direct attention. Thirty-four participants supplied self-report and facial electromyography responses to the same homogeneous (Study 3) or heterogeneous (Study 4) crowd stimuli. Results indicated that positive crowd emotions appeared to exert greater attentional pull and objective responses, while negative crowd emotions also elicited affective responses. Study 5 (n = 67) introduced a control condition (stimuli containing an individual person) to examine if responses are unique to crowds and found that emotional contagion from crowds was more intense than from individuals. These studies present methodological advances in the study of crowd emotional contagion and have implications for our broader understanding of how people process, attend, and affectively respond to crowds. Advancing theory by suggesting that emotional contagion from crowds is distinct from that elicited by individuals, findings may have applications for refining crowd management approaches. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Developing a simple risk metric for the effect of sport-related concussion and physical pain on mental health.

Risk factors associated with depression in athletes include biological sex, physical pain, and history of sport-related concussion (SRC). Due to the well-documented benefits of sport and physical activity on mental health, athletes and non-athletes were recruited to assess any differences. Beyond this, athletes were also grouped by sport-type (contact/non-contact sports) due to the increased prevalence of pain and SRC in contact sports. To our knowledge, there has been no research on how these factors influence the likelihood of depression. In the current study, 144 participants completed a short survey on the above factors and the Center for Epidemiological Studies Depression Scale. Sixty-two of these reported a history of concussion. Logistic regression revealed all the above predictors to be significantly associated with the depression scale. Individuals that had previously sustained SRC, were experiencing greater physical pain and females were more likely to display poor mental health. However, we provide further evidence for the benefits of engaging in sport and physical activity as those that took part in sport were less likely to report depression. Therefore, this study provides a simple risk metric whereby sportspeople can make a better informed choice of their sporting participation, making their own cost/reward judgement.

UK alcohol consumption during the COVID-19 pandemic: The role of drinking motives, employment and subjective mental health.

Background Previous investigations suggest that the COVID-19 pandemic effects on alcohol consumption were heterogenous and may vary as a function of structural and psychological factors. Research examining mediating or moderating factors implicated in pandemic-occasioned changes in drinking have also tended to use single-study cross-sectional designs and convenience samples. AIMS: First, to explore structural (changed employment or unemployment) and psychological (subjective mental health and drinking motives) correlates of consumption reported during the COVID-19 pandemic using a UK nationally representative (quota sampled) dataset. Second, to determine whether population-level differences in drinking during the COVID-19 pandemic (versus pre-pandemic levels) could be attributable to drinking motives. METHOD: Data collected from samples of UK adults before and during the pandemic were obtained and analysed: Step1 carried out structural equation modelling (SEM) to explore data gathered during a period of social restrictions after the UK's first COVID-19-related lockdown (27 August-15 September, 2020; n = 3,798). It assessed whether drinking motives (enhancement, social, conformity, coping), employment and the perceived impact of the pandemic on subjective mental health may explain between-person differences in self-reported alcohol consumption. Step 2 multigroup SEM evaluated data gathered pre-pandemic (2018; n = 7,902) in concert with the pandemic data from step 1, to test the theory that population-level differences in alcohol consumption are attributable to variances in drinking motives. RESULTS: Analyses of the 2020 dataset detected both direct and indirect effects of subjective mental health, drinking motives, and employment matters (e.g., having been furloughed) on alcohol use. Findings from a multigroup SEM were consistent with the theory that drinking motives explain not only individual differences in alcohol use at both time points, but also population-level increases in use during the pandemic. CONCLUSION: This work highlights socioeconomic and employment considerations when seeking to understand COVID-19-related drinking. It also indicates that drinking motives may be particularly important in explaining the apparent trend of heightened drinking during the pandemic. Limitations related to causal inference are discussed.

In people who drink more, facets of theory of mind may be impaired by alcohol stimuli.

BACKGROUND: Theory of mind (ToM) - the ability to understand others' beliefs, mental states, and knowledge - is an important part of successful social interaction. There is a growing (albeit mixed) evidence base suggesting that individuals with substance use disorder or who are intoxicated (relative to sober controls) perform worse on a number of ToM tasks. The aim of this study was to explore the hitherto little explored notion that ToM-related capabilities such as the ability to see the world from another person's perspective (termed Visual Perspective Taking; VPT), may be impacted by alcohol-related stimuli. METHOD: In this pre-registered study, 108 participants (M age = 25.75, SD age = 5.67) completed a revised version of the director task where they followed the instructions of an avatar to move both alcohol beverages and soft drinks that were mutually visible (target objects) while avoiding those only visible to the participant (distractor items). RESULTS: Contrary to predictions, accuracy was lower when the target drink was alcohol and the distractor was a soft drink, although higher AUDIT scores were associated with significantly lower accuracy when alcohol drinks were the distractor items. CONCLUSIONS: There may be some contexts when being able to see alcohol beverages makes it harder to take another person's perspective. It also appears that poorer VPT and perhaps ToM capacity may be evident in individuals who consume more alcohol. Future research is warranted to examine how alcohol beverages, alcohol consumption behaviours, and intoxication interact to impact VPT capacity.

A cross-national study of predrinking motives in Spain and the UK: Cross-sectional associations with risk-taking and alcohol consumption.

This study contrasts young people's predrinking in two European cultural contexts: Spain and the UK. Whilst UK predrinking typically occurs amongst small groups of individuals who already know one another, the distinctive Spanish context of the Botellón details a far larger gathering in which participants may be less likely to know each other. As such, predrinking motives which drive consumption and risk-taking may be expected to vary between these cultures. An online questionnaire (N = 397; UK = 167, Spain = 230) was used to examine a variety of drinking behaviours and associated beliefs/motivations including predrinking motivations, drinking behaviour, and risk taking. Path analysis was used to analyse both direct and indirect relationships between the measures with the aim of predicting problem alcohol consumption with the most parsimonious model. Varying (in)direct paths were observed between predrinking motives and alcohol consumption between the cultures. Most notably and pointing towards inconsistency in the drivers of young adults' drinking, fun predrinking motives featured prominently among Spanish respondents and predicted their reported consumption (not so in the UK), while conviviality was a more prevalent predrinking motive in the UK sample and associated with alcohol consumption (not the case in Spain). Further, (personal) risky behaviour and risk-taking predicted consumption in both samples, suggesting the importance of group norms and behaviours in predrinking activity, irrespective of alcohol consumption. These findings highlight the potential importance of the environment in which young people predrink. Given their importance in shaping alcohol consumption and risk taking in young people, cultural differences in predrinking contexts and motives warrant further investigation.

Dark Nudges: Branding Magnifies the Decoy Effect in Alcohol Purchasing Decisions.

OBJECTIVE: Public health policies aim to reduce alcohol consumption and related harms by controlling the cost and availability of alcohol, yet industry actors seek to position branded beverages appealingly vis-à-vis other products. To inform the development of regulatory strategies, it is important to understand how alcohol branding interacts with seductive pricing strategies to influence purchasing decisions. Toward this aim, the current study examines how the "decoy effect" may operate to modify purchasing decisions for branded alcoholic beverages. METHOD: Social drinkers (n = 98, 66.6% female; M AUDIT = 5.00, SD = 4.42) completed an online Decoy Assessment, choosing from a range of (non)branded, (non)alcoholic beverage offers based on price and quantity. These initial purchasing decisions were then re-assessed when a decoy product--offering a quantity in between the two original offers but at a significantly higher price--was introduced into the choice array. RESULTS: The decoy modified initial purchasing decisions for alcoholic compared with nonalcoholic beverages, and this effect was exacerbated by alcohol branding. Increases in self-reported alcohol consumption were associated with a greater change from choices for branded alcoholic beverages. CONCLUSIONS: When faced with a choice conflict, individuals who consume alcohol may be nudged into selecting more expensive branded alcoholic beverages. These findings may inform the development of alcohol control policies relating to branding and relative pricing/product placement.

Elevated ad libitum alcohol consumption following continuous theta burst stimulation to the left-dorsolateral prefrontal cortex is partially mediated by changes in craving.

Previous research indicates that following alcohol intoxication, activity in prefrontal cortices is reduced, linking to changes in associated cognitive processes, such as inhibitory control, attentional bias (AB), and craving. While these changes have been implicated in alcohol consumption behaviour, it has yet to be fully illuminated how these frontal regions and cognitive processes interact to govern alcohol consumption behaviour. The current preregistered study applied continuous theta burst transcranial magnetic stimulation (cTBS) to examine directly these relationships while removing the wider pharmacological effects of alcohol. A mixed design was implemented, with cTBS stimulation to right and left dorsolateral prefrontal cortex (DLPFC), the medial orbital frontal cortex (mOFC) and Vertex, with measures of inhibitory control, AB, and craving taken both pre- and post-stimulation. Ad libitum consumption was measured using a bogus taste task. Results suggest that rDLPFC stimulation impaired inhibitory control but did not significantly increase ad libitum consumption. However, lDLPFC stimulation heightened craving and increased consumption, with findings indicating that changes in craving partially mediated the relationship between cTBS stimulation of prefrontal regions and ad libitum consumption. Medial OFC stimulation and AB findings were inconclusive. Overall, results implicate the left DLPFC in the regulation of craving, which appears to be a prepotent cognitive mechanism by which alcohol consumption is driven and maintained.

The Effects of Placebo and Moderate Dose Alcohol on Attentional Bias, Inhibitory Control and Subjective Craving.

AIMS: Previous research indicates that acute alcohol intoxication and placebo can inhibit people's control over consumption behaviour and heighten attentional bias (AB) towards alcohol-related stimuli and craving. We designed a study to disentangle anticipated from pharmacological effects of alcohol in order to gain a clearer view of their relative contributions to alcohol consumption. METHODS: In a within-participants design (moderate alcohol dose, placebo and control), and over a minimum 2-week period, participants completed a battery of questionnaires and cognitive tasks, followed by a bogus taste task to measure ad libitum consumption. RESULTS: Both alcohol preload and placebo resulted in cognitive and psychological changes, including impaired inhibitory control, heightened AB and craving. However, ad libitum consumption only increased following alcohol and not placebo. Furthermore, inhibitory control impairments did not mediate the relationship between initial intoxication and ad libitum consumption, and findings indicate that increases in craving may mediate this association. CONCLUSION: Psychological processes such as craving may be more important in driving consummatory behaviour relative to transient changes in cognitive processes, such as inhibitory control.

Emotion and liking: how director emotional expression and knowledge of (dis)liking may impact adults' ability to follow the instructions of an ignorant speaker.

BACKGROUND: Theory of mind (ToM), the ability to understand that others have different knowledge and beliefs to ourselves, has been the subject of extensive research which suggests that we are not always efficient at taking another's perspective, known as visual perspective taking (VPT). This has been studied extensively and a growing literature has explored the individual-level factors that may affect perspective taking (e.g. empathy and group membership). However, while emotion and (dis)liking are key aspects within everyday social interaction, research has not hitherto explored how these factors may impact ToM. METHOD: A total of 164 participants took part in a modified director task (31 males (19%), M age = 20.65, SD age = 5.34), exploring how correct object selection may be impacted by another's emotion (director facial emotion; neutral × happy × sad) and knowledge of their (dis)likes (i.e. director likes specific objects). RESULT: When the director liked the target object or disliked the competitor object, accuracy rates were increased relative to when he disliked the target object or liked the competitor object. When the emotion shown by the director was incongruent with their stated (dis)liking of an object (e.g. happy when he disliked an object), accuracy rates were also increased. None of these effects were significant in the analysis of response time. These findings suggest that knowledge of liking may impact ToM use, as can emotional incongruency, perhaps by increasing the saliency of perspective differences between participant and director. CONCLUSION: As well as contributing further to our understanding of real-life social interactions, these findings may have implications for ToM research, where it appears that more consideration of the target/director's characteristics may be prudent.

An examination of the extent to which drinking motives and problem alcohol consumption vary as a function of deprivation, gender and age.

INTRODUCTION: Existing research points to a link between socioeconomic factors, alcohol consumption and harms, while another body of work documents the importance of varying motivations to drink in shaping alcohol behaviours. Yet, little is currently known about the extent to which alcohol consumption may be differentially associated with drinking motives as a function of deprivation, gender and age. METHODS: Cross-sectional analysis of data from a UK sample aged between 18 and 75 years (n = 1639; 51% male, Mage 47.74, SD 14.66). Structural equation modelling, using clustering to account for the multi-level nature of the data set, was carried out to assesses the relationships between deprivation (Index of Multiple Deprivation), occupation, age, gender and problem alcohol consumption (Alcohol Use Disorder Identification Test) and social, conformity, enhancement and coping drinking motives. RESULTS: Coping, enhancement and conformity, but not social, motives were associated with problem alcohol consumption. Drinking motives were stronger predictors of problem consumption than gender and age, with motives tending to be endorsed more strongly by younger and male respondents. Responses from participants with working-class occupations tended to be characterised by elevated endorsements of coping motives. DISCUSSION AND CONCLUSION: Drinking motives are stronger predictors of problem alcohol consumption than socio-demographic variables although these factors exert influences on people's motives to drink.

Stimulation of the dorsolateral prefrontal cortex impacts conflict resolution in Level-1 visual perspective taking.

Theory of mind is the ability to understand others' beliefs, mental states, and knowledge. Perspective-taking is a key part of this capacity, and while previous research has suggested that calculating another's perspective is relatively straightforward, executive function is required to resolve the conflict between the self and that other perspective. Previous studies have shown that theory of mind is selectively impaired by transcranial magnetic stimulation (TMS) of the dorsolateral prefrontal cortex (DLPFC). However, it has been hitherto unclear as to which specific aspect of perspective-taking is impacted. The current study administered rTMS (N = 31 adult participants) to the DLPFC (active condition) and vertex (control condition) in a within-subjects design. Participants completed a L1 VPT task after each stimulation session, and focus (relative performance on self-perspective trials compared with other perspective trials) and conflict indices (relative ability to resolve competing self/other perspectives) were calculated. Results showed that stimulation of the DLPFC selectively impaired the conflict index, suggesting that the DLPFC may be causally related with the resolution of conflict between self and other perspectives, and that self-other interference may rely on domain-general processes.

Can beauty be-er ignored? A preregistered implicit examination of the beer goggles effect.

The beer goggles effect refers to heightened perceptions of attractiveness resulting from intoxication. However, research in this area has produced mixed findings and has largely been reliant on self-report measures of perceived attractiveness. This study aimed to utilize an implicit measure to assess the beer goggles phenomenon in a preregistered study. One hundred twenty-nine heterosexual U.K. university students were recruited (74 female, Mage = 24.12 years, SDage = 9.09 years) in real-life drinking environments (classified post hoc as sober or lightly intoxicated based on Blood Alcohol Concentration [BAC]) to conduct a spatial cuing paradigm that measured the effect of distracting stimuli on task performance. Participants were asked to determine the orientation of a letter while ignoring any incidentally presented (un)attractive facial stimuli. Sober participants appeared to find attractive faces equally distracting, regardless of whether they were being cued to look toward or away from the face-a traditional attractiveness bias. Intoxicated participants, on the other hand, appeared to find attractive and unattractive faces equally distracting. Findings highlight the possibility that the beer goggles phenomenon results from a leveling of the playing field whereby attentional biases toward attractive faces are dampened as a result of light intoxication. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Does interference between self and other perspectives in theory of mind tasks reflect a common underlying process? Evidence from individual differences in theory of mind and inhibitory control.

Theory of mind (ToM), the ability to understand that other agents have different beliefs, desires, and knowledge than oneself, has been extensively researched. Theory of mind tasks involve participants dealing with interference between their self-perspective and another agent's perspective, and this interference has been related to executive function, particularly to inhibitory control. This study assessed whether there are individual differences in self-other interference, and whether these effects are due to individual differences in executive function. A total of 142 participants completed two ToM (the director task and a Level 1 visual perspective-taking task), which both involve self-other interference, and a battery of inhibitory control tasks. The relationships between the tasks were examined using path analysis. Results showed that the self-other interference effects of the two ToM tasks were dissociable, with individual differences in performance on the ToM tasks being unrelated and performance in each predicted by different inhibitory control tasks. We suggest that self-other differences are part of the nature of ToM tasks, but self-other interference is not a unitary construct. Instead, self-other differences result in interference effects in various ways and at different stages of processing, and these effects may not be a major limiting step for adults' performance on typical ToM tasks. Further work is needed to assess other factors that may limit adults' ToM performance and hence explain individual differences in social ability.

Beer? Over here! Examining attentional bias towards alcoholic and appetitive stimuli in a visual search eye-tracking task.

RATIONALE: Experimental tasks that demonstrate alcohol-related attentional bias typically expose participants to single-stimulus targets (e.g. addiction Stroop, visual probe, anti-saccade task), which may not correspond fully with real-world contexts where alcoholic and non-alcoholic cues simultaneously compete for attention. Moreover, alcoholic stimuli are rarely matched to other appetitive non-alcoholic stimuli. OBJECTIVES: To address these limitations by utilising a conjunction search eye-tracking task and matched stimuli to examine alcohol-related attentional bias. METHODS: Thirty social drinkers (Mage = 19.87, SD = 1.74) were asked to detect whether alcoholic (beer), non-alcoholic (water) or non-appetitive (detergent) targets were present or absent amongst a visual array of matching and non-matching distractors. Both behavioural response times and eye-movement dwell time were measured. RESULTS: Social drinkers were significantly quicker to detect alcoholic and non-alcoholic appetitive targets relative to non-appetitive targets in an array of matching and mismatching distractors. Similarly, proportional dwell time was lower for both alcoholic and non-alcoholic appetitive distractors relative to non-appetitive distractors, suggesting that appetitive targets were relatively easier to detect. CONCLUSIONS: Social drinkers may exhibit generalised attentional bias towards alcoholic and non-alcoholic appetitive cues. This adds to emergent research suggesting that the mechanisms driving these individual's attention towards alcoholic cues might 'spill over' to other appetitive cues, possibly due to associative learning.

Alcohol belongs here: Assessing alcohol-related inhibitory control with a contextual go/no-go task.

There is a growing awareness of the need to explore the social and environmental milieus that drive alcohol consumption and related cognitions. The current study examined the extent to which alcohol-congruent and incongruent drinking contexts modulate alcohol-related inhibitory control using a novel go/no-go task. One hundred and eight participants (Mage = 20 years; SD = 4.87) were instructed to inhibit their responses to visual alcoholic (alcohol/no-go condition, n = 50) or nonalcoholic stimuli (alcohol/go condition, n = 58) depicted in an alcohol-congruent (pub), incongruent (library), or context-free (control) condition. Participants in the alcohol/go condition exhibited higher false alarm rates (FAR) toward nonalcoholic stimuli and faster reaction times (RTs) to alcoholic stimuli depicted in the alcohol-congruent and incongruent context compared with the alcohol/no-go condition. In contrast, FAR toward alcoholic stimuli (alcohol/no-go condition) were not significantly affected by drinking context, but RT was faster when nonalcoholic stimuli were presented in alcohol-incongruent (i.e., library) compared with alcohol-congruent (i.e., pub) contexts. The discussion turns to potential explanations for these findings, suggesting that social drinkers might exhibit approach tendencies toward alcoholic images that translate into errors toward nonalcoholic stimuli, and that image complexity influences response inhibition. (PsycINFO Database Record (c) 2019 APA, all rights reserved).

Continuous Theta Burst Transcranial Magnetic Stimulation of the Right Dorsolateral Prefrontal Cortex Impairs Inhibitory Control and Increases Alcohol Consumption.

Previous research indicates that alcohol intoxication impairs inhibitory control and that the right dorsolateral prefrontal cortex (rDLPFC) is a functional brain region important for exercising control over thoughts and behaviour. At the same time, the extent to which changes in inhibitory control following initial intoxication mediate subsequent drinking behaviours has not been elucidated fully. Ascertaining the extent to which inhibitory control impairments drive alcohol consumption, we applied continuous theta burst transcranial magnetic stimulation (rDLPFC cTBS vs. control) to isolate how inhibitory control impairments (measured using the Stop-Signal task) shape ad libitum alcohol consumption in a pseudo taste test. Twenty participants (13 males) took part in a within-participants design; their age ranged between 18 and 27 years (M = 20.95, SD = 2.74). Results indicate that following rDLPFC cTBS participants' inhibitory control was impaired, and ad libitum consumption increased. The relationship between stimulation and consumption did not appear to be mediated by inhibitory control in the present study. Overall, findings suggest that applying TMS to the rDLPFC may inhibit neural activity and increase alcohol consumption. Future research with greater power is recommended to determine the extent to which inhibitory control is the primary mechanism by which the rDLPFC exerts influence over alcohol consumption, and the degree to which other cognitive processes may play a role.

Executive function underlies both perspective selection and calculation in Level-1 visual perspective taking.

Previous research has suggested that the calculation of another's perspective is cognitively efficient, whereas perspective selection (selection of a particular perspective, self or other) is associated with executive function, particularly inhibitory control. However, research has not previously tested how perspective calculation and selection may be associated with another key executive function, working memory. In the present study (N = 54 adult participants), we administered a Level-1 visual perspective task in a dual-task paradigm in which the secondary task required working memory. The results suggest that executive function is associated with both perspective calculation and perspective selection, contrary to previous evidence from similar dual-task studies that had used inhibitory control and attention-based secondary tasks. This contrast may suggest that working memory capacity facilitates perspective-taking. Furthermore, it may follow that the notion of simple perspective-taking is distinct from more the complex and cognitively demanding "theory of mind." Research of this nature warrants further investigation.

Controlling for Prior Attainment Reduces the Positive Influence that Single-Gender Classroom Initiatives Exert on High School Students' Scholastic Achievements.

Research points to the positive impact that gender-segregated schooling and classroom initiatives exert on academic attainment. An evaluation of these studies which reveal positive effects highlights, however, that students are typically selectively assigned to single- or mixed-gender instructional settings, presenting a methodological confound. The current study controls for students' prior attainment to appraise the efficacy of a single-gender classroom initiative implemented in a co-educational high school in the United Kingdom. Secondary data analysis (using archived data) was performed on 266 middle-ability, 11-12 year-old students' standardized test scores in Languages (English, foreign language), STEM-related (Mathematics, Science, Information and Communication Technology), and Non-STEM subjects (art, music, drama). Ninety-eight students (54, 55% female) were taught in single-gender and 168 (69, 41% female) in mixed-gender classrooms. Students undertook identical tests irrespective of classroom type, which were graded in accordance with U.K national curriculum guidelines. Controlling for students' prior attainment, findings indicate that students do not appear to benefit from being taught in single-gender relative to mixed-gender classrooms in Language and STEM-related subjects. Young women benefitted from being taught in mixed-gender relative to single-gender classes for Non-STEM subjects. However, when prior ability is not controlled for, the intervention appears to be effective for all school subjects, highlighting the confounding influence of selective admissions. These findings suggest that gender-segregated classroom initiatives may not bolster students' grades. It is argued that studies that do not control for selection effects may tell us little about the effectiveness of such interventions on scholastic achievement.