Differences in personality or social style between the subject groups must also be considered. Subjects from the current investigation were well characterized with regard to their clinical and demographic status, and were investigated using a backward masking task, preventing subjects from consciously “overthinking” about the stimuli, however, formal personality testing was not completed. Although we did not evaluate subjects on the basis of their overall level of social interaction or other social functions, it is possible that marijuana use exerts an effect on social style, thus, some marijuana smokers may be more social than others, or less so. As our sample is comprised of fairly young adults, all of whom are clinically stable, are functioning at a fairly high level in either their academic or employment settings and who primarily belong to extended social groups, we do not believe that our findings are related to differences in social interactive style between the groups. The potential confound of marijuana use on social behavior should be investigated in future studies which include measures of personality and interactive behaviors. It is also unlikely
