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Aims: To estimate the effect of acute alcohol consumption on risk-taking while gambling, examine blood alcohol concentration as a moderator and explore possible moderators of this effect. Design, Setting andParticipants: A systematic review and meta-analysis was completed. A Boolean search strategy was used to identify studies that included (a) alcohol consumption as an independent variable; (b) a gambling or risk-taking task; (c) a control or placebo comparison; (d) human participants; and (e) English publications. Descriptive information, sample characteristics and experimental data were extracted from each study. Searched databases included: PsycINFO, Web of Science, Medline, Cochrane Library and ProQuest Dissertations and Theses. Included as participants were experiments that compared the effects of alcohol and non-alcoholic or placebo beverages on risk-taking while gambling.Measurement: Comprehensive Meta-Analysis version 3.3.070 was used. Standardized mean differences of risk-taking while gambling between the experimental and control conditions were calculated when studies did not report effect sizes. Random-effects models were used for overall effect and meta-regressions while mixed-effects models were used for subgroup analyses.Findings: Twenty articles containing 47 alcohol versus control comparisons met inclusion criteria. The overall Hedges'g for the difference between groups consuming alcohol and groups consuming a placebo or non-alcoholic drink control was 0.03, 95% confidence interval (CI) = −0.07, 0.12, p = 0.60, indicating no significant difference. Larger effect sizes were found for studies using non-alcoholic control drinks (Hedges' g = 0.30, 95% CI = 0.01, 0.58) compared to placebo beverages (Hedges' g = −0.03, 95% CI = −0.13, 0.06), Cochran's Q = 4.67, p = 0.03.Conclusions: Finding that acute alcohol consumption had no reliable effect on risk-taking while gambling was consistent with existing animal research. No support was found for the relation between alcohol dose and risk-taking. The significantly larger effect size for experiments using non-alcoholic versus placebo beverages suggests the potential role of expectancy effects.

Casual sexual relationships (CSRs) are common among young adults. Although it is a widely discussed topic in the popular media, little empirical work has examined the expectations related to communication within these relationships. Moreover, few studies have made comparative examinations across various relationship types. Through two studies, we first identified the differences in communication, satisfaction, and commitment across relationship types. Then we examined communication frequency as a regulator of satisfaction and commitment across relationship types. In Study 1, participants responded to a hypothetical relationship scenario depicting either a committed relationship (CR), friends with benefits (FWB), or a booty call/fuck buddy relationship (BC/FB); they indicated how committed and satisfied they would feel as well as how frequently they would communicate with the partner. Participants in Study 2 reported on these variables in their most recently terminated relationship. Overall, we found the highest frequencies of commitment and communication in CRs; BCs/FBs and other similar CSRs had the lowest. FWBs often fell between the other two categories. Satisfaction did not differ reliably across relationship types. A serial mediational analysis revealed that the more a relationship was considered to be a CR, the more partners communicated, which was associated with more satisfaction and, in turn, commitment. Our findings highlight the distinctions between expectations within FWB relationships, compared to other relationships types, suggesting that they fall somewhere between CRs and other CSRs on commitment and relational expectations. In addition, the results support the idea that individuals intentionally regulate their communication to maintain the expected level of commitment within a relationship.

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