Contingency management is associated with positive changes in attitudes and reductions in cannabis use even after discontinuation of incentives among non-treatment seeking youth.

BACKGROUND: It is important to identify interventions that reduce harm in youth not motivated to change their cannabis use. This study evaluated how short-duration contingency management (CM) impacts cannabis use attitudes and behavior after abstinence incentives are discontinued among non-treatment seeking youth. METHODS: Participants (N=220) were randomized to 4 weeks of abstinence-based CM (CB-Abst; n=126) or monitoring (CB-Mon; n=94). Participants completed self-report and provided biochemical measures of cannabis exposure at baseline, end-of-intervention, and 4-week follow-up. Changes in self-reported cannabis use frequency (days/week; times/week) and biochemically verified creatinine-adjusted 11-nor-9-carboxy-tetrahydrocannabinol concentrations (CN-THCCOOH) were analyzed between groups from baseline to follow-up. In CB-Abst, cannabis use goals at end-of-intervention were described and changes in cannabis use at follow-up were explored by goals and cannabis use disorder (CUD) diagnosis. RESULTS: There was a group by visit interaction on cannabis use (days: beta=0.93, p=0.005; times: beta=0.71, p<0.001; CN-THCCOOH: beta=0.26, p=0.004), with reductions at follow-up detected only in CB-Abst. Following 4 weeks of abstinence, 68.4% of CB-Abst participants wanted to reduce or abstain from cannabis use following completion of CM. Those in CB-Abst who set end-of-intervention reduction goals and were without CUD had greater decreases in cannabis use frequency at follow-up (Goals*time on days/week: beta=-2.27, p<0.001; CUD*time on times/week: beta=0.48, SE=0.24, t=2.01, p=0.048). CONCLUSIONS: Findings support the utility of brief incentivized abstinence for generating motivation to reduce cannabis use and behavior change even after incentives end. This study supports CM as a potentially viable harm reduction strategy for those not yet ready to quit.

Do preschoolers track and evaluate social includers and excluders?

Social exclusion is harmful and leads to negative consequences across the lifespan. Based on studies primarily with adults, psychologists have characterized a highly sensitive "ostracism detection system" that acts quickly and automatically to detect exclusion and mitigate its effects. However, research with children has not fully explored whether a system with similar characteristics is operational in early childhood, and prior work probing children's responses to exclusion has produced mixed findings. We investigated 4- to 6-year-old children's abilities to negatively evaluate those who have excluded them as well as to use these experiences for prosocial gossip. Children engaged one pair of play partners in an inclusive game and engaged another pair in an exclusive game. Nearly one third (n = 28 of 96) did not accurately recall who had excluded them. Yet those who did recall their game experiences evaluated excluders more negatively than includers, and they were less likely to recommend excluders as play partners to others. These findings indicate that not all children sensitively track their excluders' identities-but those who do so will evaluate excluders negatively. More work is needed to understand developments in how and when children recognize their own exclusion and whether the underlying processes should be viewed as homologous to adults' ostracism detection system.

Children's developing views of social excluders: A dissociation between social evaluation and partner preference.

When facing social exclusion, children seek to strengthen existing social connections and form new ones. This study asked whether they also make strategic choices about the targets of their affiliative goals. Three- to six-year-olds (N = 69; 36 female; mostly non-Hispanic White) observed characters acting inclusively or exclusively. All ages viewed excluders more negatively than includers, but only five- and six-year-olds preferred includers as play partners. Despite easily detecting and remembering exclusion events, younger children expressed no play partner preference. Children's verbal justifications revealed that older children choose partners more carefully and draw on a richer understanding of exclusion. More generally, the initial dissociation between social evaluation and preference formation underscores that these are distinct processes with different developmental trajectories.