An important facet of daily memory function is prospective memory, which is one’s ability to complete established intentions in the appropriate temporal and spatial context. Many factors contribute to impairments in prospective memory, such as limited cognitive resources or aging. A factor that has been subject to recent investigation is how cannabis use may have an impact on the mechanisms that contribute to prospective memory. Cannabis use has been on the rise across the world, and in the United States more states are pushing to legalize its recreational use, if they haven’t already. As this substance becomes more easily accessible, akin to alcohol use, the necessity to investigate its potential consequences on cognition is needed now more than ever. Prospective memory is an appropriate measure of cannabis-induced deficits due to the wide literature looking at neural correlates of the component mechanisms that contribute to successful prospective memory, attentional and memory processes. The current study employed two experiments to measure this argued claim. Experiment 1 replicated well-defined effects from the prospective memory literature by measuring task accuracy (memory), response times (attention), and pupillary dynamics (attention). Informed by the research looking at the brain regions suspected of experiencing the most functional impairment, Experiment 2 aimed to extend these findings with a sample of participants following acute cannabis administration, however, results indicated cannabis group performance was similar in accuracy and showed faster mean latencies to that of the control group.

With the growing popularity of medical cannabis, and high rates of cannabis use disorder (CUD) among medical cannabis users, it is more important than ever to accurately identify the proximal antecedents and subjective effects of medical cannabis use. Subjective antecedents and effects have been proposed as key mechanisms underlying the transition from cannabis use to CUD, but little research has examined medical cannabis users’ experiences in real-time, real-world settings. The current study of 86 young-adult medical cannabis users ages 18-30 (32.6% female) used ecological momentary assessment (EMA) to characterize the antecedents and effects of medical cannabis use, and to examine whether these antecedents and effects vary as a function of CUD severity. Higher craving, pain, and withdrawal symptoms predicted greater odds of cannabis use at the next report, and lower subjective ‘high’ predicted greater odds of cannabis use at the next report. Use of medical cannabis was associated with increases in positive affect, stimulation, relaxation, and subjective ‘high’, decreases in negative affect, withdrawal symptoms, craving, and pain, and increases in cognitive problems, psychotic-like experiences, and adverse bodily effects. Further, following cannabis use, medical users with more CUD symptoms reported greater relief from craving, attenuated increases in stimulation and relaxation, and enhanced increases in sluggishness, cognitive problems, psychotic-like symptoms, and bodily symptoms. Results suggest that medical cannabis use, like recreational use, is associated with a wide range of subjective antecedents and effects, and that relief from cannabis craving may play an important role in the maintenance of CUD among medical users.

Relations between two aspects of the parent-child relationship, parent warmth and modeling of emotion expression, and youth internalizing and externalizing problems and maladaptive grief were examined in a longitudinal sample of parentally bereaved youth. Youth expressive suppression was tested as a mediator of these relations and youth age was examined as a moderator. Parentally bereaved youth (N=244) aged 8 to 16 and their parents were assessed at three timepoints. Across 14 months, parent modeling of maladaptive emotion expression was significantly associated with increased parent report of both internalizing and externalizing problems, and youth report of parental warmth was significantly associated with decreased youth report of externalizing problems. There was no support for youth expressive suppression mediating these relations and the pattern of relations did not differ significantly by youth age. Implications for intervention programs targeting parents and youth are discussed.

This study investigated low regulatory flexibility as a mechanism of the associations of rumination with affect, internalizing symptoms, and substance use and problems. 403 first-year college students completed an online baseline survey assessing rumination, regulatory flexibility, internalizing symptoms, alcohol use, cannabis use, alcohol problems, and cannabis problems. Roughly 2.67 months later, 261 of these participants completed a follow-up survey assessing internalizing symptoms and substance use and problems. Additionally, 71 of the 403 participants completed an experimental study. Thirty-three participants were randomly assigned to undergo a rumination induction, and 38 were assigned to a control condition. All lab participants underwent an interpersonal stress task during which regulatory flexibility was observed and completed pre-test and post-role-play measures of positive and negative affect. Experimental study results showed regulatory flexibility did not mediate effects of rumination induction on positive (indirect effect: standardized beta (β)=-0.01, unstandardized beta (b)=-0.12, 95% Confidence Interval (CI) [-0.64, 0.41], p=.66) or negative affect (indirect effect: β=0.01, b=0.17, 95% CI [-0.29, 0.63], p=.48). Longitudinal study results showed regulatory flexibility did not mediate associations between baseline rumination and follow-up internalizing symptoms (indirect effect: b=0.01, 95% CI [-0.03, 0.05], p=.57), alcohol use (indirect effect: b=-0.03, 95% CI [-0.09, 0.04], p=.39), cannabis use (indirect effect: b=0.10, 95% CI [-0.06, 0.26], p=.21), alcohol problems (indirect effect: b=-0.05, 95% CI [-0.18, 0.07], p=.40), or cannabis problems (indirect effect: b=-0.10, 95% CI [-0.36, 0.16], p=.43). However, rumination predicted greater internalizing symptoms (Incidence Rate Ratio (IRR)=1.26, b=0.23, 95% CI [0.08, 0.37], p=.003) and cannabis problems (IRR=1.73, b=0.55, 95% CI [0.23, 0.87], p=.001). Regulatory flexibility predicted fewer alcohol use days (IRR=0.76, b=-0.27, 95% CI [-0.49, -0.05], p=.015) and problems (IRR=0.58, b=-0.55, 95% CI [-0.95, -0.15], p=.007), and less cannabis use for women (IRR=0.59, b=-0.53, 95% CI [-0.92, -0.14], p=.007) and fewer cannabis problems for men (IRR=0.21, b=-1.55, 95% CI [-2.50, -0.60], p=.001). Lack of agreement about how best to measure regulatory flexibility makes it unclear whether null associations were due to measurement problems or actual null effects. Research on how best to measure this construct is a priority. Findings indicate rumination and regulatory flexibility may be promising intervention targets.

Background: Hash oil, a cannabis preparation that contains ultra-high concentrations of tetrahydrocannabinol (THC), is quickly gaining popularity in the United States. Some evidence suggests that hash oil might produce greater intoxication and more severe negative effects than marijuana. This study examined whether the subjective effects of hash oil are more extreme than the subjective effects of marijuana and whether frequency of hash oil use is associated with the subjective effects of marijuana and hash oil. Method: Past-year cannabis users (n = 1,268) were recruited online to complete a questionnaire about the subjective effects of cannabis. Participants who reported past-year use of both hash oil and marijuana (n = 574) rated subjective effects of each type of cannabis in the following positive and negative domains: positive affect, cognitive enhancement, negative affect, cognitive impairment, physiological effects, reduced consciousness, and psychotic-like experiences. Results: Results of within-person comparisons showed that hash oil was rated as producing lesser positive effects (Hash oil: M = 4.53, Marijuana: M = 5.55, t = 14.67, p < .001) than marijuana. Negative effects of hash oil were minimal for the full sample (n = 574) and for both frequent and infrequent hash oil users. In general, the frequency of hash oil use was not associated with the subjective effects of marijuana but more frequent hash oil use was associated with rating hash oil as producing greater positive effects ( = 0.28, t = 6.86, p < .001) and lesser negative effects ( = -0.16, t = -3.83, p < .001). Findings were unchanged after controlling for sex, medical cannabis use, and frequency of marijuana use.

Conclusions: Hash oil produced lesser positive effects than marijuana. Negative effects of hash oil were minimal, suggesting that extreme negative effects may be unlikely for experienced cannabis users.

There is a robust association between psychosis and cannabis use, but the mechanisms underlying this relation are poorly understood. Because both psychosis and cannabis use have been linked to cardiovascular problems, it is possible that cannabis use exacerbates an underlying vascular vulnerability in individuals prone to psychosis. To investigate microvascular differences in individuals with psychotic symptoms and cannabis use, the current study tested associations between psychotic-like experiences, cannabis use, and retinal vessel diameter in 101 young adults (mean age=19.37 years [SD=1.93]). Retinal venular diameter did not differ between participants with (M=218.08, SD=15.09) and without psychotic-like experiences (M=216.61, SD=16.18) (F(1, 97)=0.01, p=.93) or between cannabis users (M=218.41, SD=14.31) and non-users (M=216.95, SD=16.26) (F(1, 97)=0.37, p=.54). Likewise, mean retinal arteriolar diameter did not differ between participants with (M=157.07, SD=10.96) and without psychotic-like experiences (M=154.88, SD=9.03) (F(1, 97)=0.00, p=.97). However, cannabis users had statistically significantly wider retinal arterioles (M=159.10, SD=9.94) than did non-users (M=154.29, SD=10.20) (F(1, 97)=5.99, p=.016), and this effect was robust to control for covariates. There was no evidence of an interaction between psychotic-like experiences and cannabis use in predicting retinal vessel diameter. These results indicate that cannabis use is associated with microvascular differences in young adulthood. Given current trends toward legalization of recreational cannabis use, future research should explore these differences and their potential consequences for cardiovascular health.

Alcohol use disorders and internalizing disorders are highly comorbid in adults, but how this comorbidity unfolds over development is not well understood. Previous retrospective studies in adults have shown that internalizing problems are associated with a rapid transition from first drink and first regular drinking to the onset of alcohol dependence. Some results also suggest that internalizing is a stronger predictor of rapid transitions through later stages of alcohol involvement, but these stage-specific effects have not been explicitly tested. The present study utilized a prospective dataset to investigate effects of adolescent internalizing symptoms on speed of transition through multiple stages of alcohol involvement. Specifically, it was hypothesized that greater early internalizing symptoms would predict a later age of first drink, a slower transition from first drink to first binge, and a faster transition from first binge to first dependence symptom. The moderating effects of gender were also examined. Data were from a longitudinal study of children of alcoholics and matched controls (n = 454) followed from late childhood to mid-life. Linear regression and Cox regression were the primary analytic strategies. Covariates were externalizing symptoms, family history of alcohol use disorders, and gender. Analyses also controlled for age at which the participant entered each interval. Generally, stage-specific hypotheses concerning the effects of internalizing were not supported. Internalizing symptoms marginally predicted an earlier age of first drink and a faster transition from first binge to first dependence symptom, and significantly predicted a faster transition through the overall interval from first drink to first dependence symptom. Internalizing was a stronger predictor of rapid transitions for women, and the effects of internalizing were not specific to early or later stages of alcohol involvement among women. These results suggest that early internalizing problems are a general risk factor for a rapid transition through all stages of alcohol involvement, and this risk may be stronger for women than for men. These results have important implications for our theoretical understanding of the relationship between internalizing problems and alcohol use disorders as well as prevention and intervention efforts targeting these problems.