I think this study is inconclusive. At least the way it's stated.
this is not the study, only a simple interview. I am sure the actual published study, like all actual research published, has the complete methodology along with the population used, stats, # of trials run, significance test used, quantitative data, explanation of variable control on both dependant an independant variables, and path analysis. Unfortunately the article itself is not online, I may try to get a copy of it when the new semester starts.