Tangential, perhaps, to psychology, although the brain disorder issue is relevant, but correlation-causation is a frequent thread here. So see:
http://www.news-medical.net/?id=21890 and I tracked the original paper down to this: Weintraub, S. et al (2006). Vasectomy in Men With Primary Progressive Aphasia. Cognitive and Behavioral Neurology, 19(4):190-193, December [ http://tinyurl.com/yr67r4 abstract only unless you have $$$] She does appropriately caution, "This is just a correlational observation", but the mechanism is plausible. As PPA is unlikely to cause vasectomy, either it's the other way around, or there's a third variable involved. But who's going to volunteer for a randomized study? Heck, who's going to want to be vasectomized after this becomes known? (Study aparently finds elevated chance of having had a vasectomy for men with PPA. I suppose we need to also know what the chance is of developing PPA after vasectomy. If it's really low, I guess those who have been so fixed can stop worrying). And in case women here don't think this relates to them, the final sentence of the abstract reads: "Antisperm antibodies can also develop in women and become risk factors for PPA." Stephen ----------------------------------------------------------------- Stephen L. Black, Ph.D. Department of Psychology Bishop's University e-mail: [EMAIL PROTECTED] 2600 College St. Sherbrooke QC J1M 0C8 Canada Dept web page at http://www.ubishops.ca/ccc/div/soc/psy TIPS discussion list for psychology teachers at http://faculty.frostburg.edu/psyc/southerly/tips/index.htm ----------------------------------------------------------------------- --- To make changes to your subscription go to: http://acsun.frostburg.edu/cgi-bin/lyris.pl?enter=tips&text_mode=0&lang=english
