The studies were conducted by Bruce Alexander, professor emeritus at Simor Fraser university. Dr. Alexander's bio page links to the wikipedia page explaining the study, so someone there must think that wikipedia is representing the study accurately.
NOTE: I expect there are controversies and complexities galore involved in this study and the researcher's conclusions, so as always, please read through the material thoroughly and use it only if you think it's appropriate for your classroom. Thanks for sending this link my way, Scott!
posted by Rob McEntarffer