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<jats:p> This study aimed to identify the motives for social media sites use in the general population and determine what personality traits (normal and maladaptive) predict different motives for social media sites use. Another objective was to analyze which motives for SMSs use are related to well-being. The sample consisted of 420 subjects (211 men, 209 women), mean age 40.29 years ( SD =  14.93). Data were gathered using the Big Five Inventory, the Personality Inventory for DSM-5-Brief Form -Adult, the Mental Health Continuum-Short Form, and a scale designed ad hoc to evaluate the motives for social media sites use. The results showed that the most frequent motives were Personal relationship maintenance/Search for information, Pastime/Exhibitionism, and Search for companionship. In addition, it was found that normal and, especially, maladaptive personality traits increased the explained variance for the three motives for social media sites use, beyond age and gender. Predictors of relationship initiation and pastime/exhibitionism motives were related to more negative features (e.g., antagonism and disinhibition) than predictors of personal relationship maintenance/search for information. Finally, personal relationship maintenance/search for information was positively related to all the components of well-being, while the other motives for social media sites use were negatively associated with well-being. </jats:p>

<jats:p> Many American and Dutch adolescents use marijuana regularly. There is concern that such use may impair cognitive function more in adolescents than adults. We examined effects of regular marijuana use on long-term memory and perseveration among American and Dutch adolescents. We administered Buschke's Selective Reminding Test (BSRT) to assess long-term memory and the Wisconsin Card Sorting Test (WCST) to assess perseveration in male teenagers. Usable test data were obtained for 12 American marijuana users, 13 American controls, 9 Dutch marijuana users, and 12 Dutch controls. In BSRT, users showed lower overall long-term storage than controls (adjusted means ± SE's for numbers of words per trial of 9.4 ± 0.2, 13.4 ± 0.3, 11.7 ± 0.2, and 12.4 ± 0.2 for American users, Dutch users, American controls, and Dutch controls, respectively). Marijuana was associated with memory effects only in American, not Dutch, users. Bivariate Pearson correlations for American and Dutch users combined showed associations of lower total recall with more uses in the previous year and lifetime (r = –0.61 and r = –0.53, respectively); and more perseverative errors with more uses in the previous year (r = 0.55). Some findings were consistent with the possibility that regular adolescent marijuana use causes deficits in cognition, especially memory. However, a causal interpretation cannot be inferred from our findings and is challenging to reconcile with the observation of memory deficits only in American users. Our study was novel in examining the influence of nationality on marijuana's cognitive effects. More studies of this topic should compare effects across nationalities or cultures. </jats:p>

<jats:sec><jats:title>Background</jats:title><jats:p> Social stigma is a barrier for students with autism on college campuses. The purpose of this study is to examine the relationship between autism knowledge and autism stigma endorsement. </jats:p></jats:sec><jats:sec><jats:title>Method</jats:title><jats:p> 144 college undergraduate students were asked to complete the Autism Stigma and Knowledge Questionnaire as well as a brief demographic questionnaire. The relationship between stigma endorsement and ASD knowledge in the areas of diagnosis and symptoms, etiology, and treatment were evaluated using a multiple linear regression. Two independent-sample t-tests were conducted to investigate group differences between participants who know someone with autism and those who do not as well as between male and female participants. </jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p> A significant regression equation was found ( F(3,140) = 51.35, p = .000), with an R<jats:sup>2</jats:sup> of .52. While Treatment and Etiology subscale scores significantly predicted Stigma subscale scores, Diagnosis/Symptom subscale score was not. In terms of knowing someone with an autism diagnosis, there was a significant difference in ASD diagnosis and symptom knowledge ( t(142) = 4.16, p = .000), etiology knowledge ( t(142) = 3.51, p = .001), treatment knowledge ( t(62.99) = 3.54, p = .001), and stigma endorsement ( t(142) = 3.03, p = .003). No significant differences were found between male and female participants. </jats:p></jats:sec><jats:sec><jats:title>Conclusions</jats:title><jats:p> Contrary to past studies, gender was not associated with ASD knowledge or stigma endorsement. This study suggests that an intervention designed to increase ASD knowledge, particularly in the areas of etiology and treatment, and to increase contact with students diagnosed with autism would be effective in reducing ASD stigma. </jats:p></jats:sec>