-Caveat Lector- Source: University Of Illinois At Urbana-Champaign (http://www.uiuc.edu/) Date: Posted 6/20/2001 Heavy Consumption Of Tainted Fish Curbs Adult Learning And Memory CHAMPAIGN, Ill. — PCB-laden fish from Lake Michigan affect not only young children but also adults over age 49, researchers say. Many of the former big eaters of sport-caught fish now have high levels of polychlorinated biphenyls in their blood and problems with learning and memory. Since 1992, researchers, led by Susan L. Schantz of the University of Illinois College of Veterinary Medicine, have studied Lake Michigan fish- eaters, many of whom regularly had eaten more than 24 pounds of sport- caught fish a year. The researchers’ latest findings show that the heavy eaters who are now over age 49 have problems learning and remembering new verbal information. "This study suggests, for the first time, that PCB body burdens in adulthood may be associated with impairments in certain aspects of memory and learning," Schantz said. "The focus has been almost exclusively on increased health risks of exposure to children and pregnant women. It had been assumed that mature adults are less susceptible than are developing fetuses. This may not be the case." PCBs were widely used – until banned in the late 1970s – as electrical insulators and lubricants and as extenders in paints and varnishes. The chemicals decompose slowly and are virtually non-biodegradable. Large quantities remain in older electrical equipment still in use. In the Great Lakes, PCBs make their way up the food chain and accumulate at increasing levels in fatty tissue. The new study by researchers at four institutions is to go on line June 5 and appear in print in the June issue of Environmental Health Perspectives, a journal of the National Institutes of Health. They also found elevated levels of DDE (a breakdown product of DDT), lead and mercury in the heavy fish-eaters, but the only negative effects were tied to blood serum levels of PCBs. Fish-eaters with high blood PCB levels had difficulties recalling a story told just 30 minutes earlier. They also were less likely than their less-exposed peers to cluster words given orally into categories based on their meaning to boost recall, said Schantz, a professor of toxicology in the department of veterinary biosciences. Researchers used the Weschsler Memory Scale and the California Verbal Learning Test, both standard tools for measuring cognitive abilities. In the 1990s, Drs. Joseph and Sandra Jacobsen of Michigan’s Wayne State University reported that exposure to low levels of PCBs disrupted fetal brain development, leading to neurological abnormalities and learning disabilities, including memory deficits, in affected children. Schantz previously reported that high levels of PCBs in adult fish-eaters resulted in barely a hint of problems with fine motor skills such as dexterity and hand steadiness. In the latest work, researchers also did not find statistically significant problems with many other cognitive abilities, such as executive function (planning and attention) and visual-spatial function. Researchers in the study were from the UI, Michigan State University, the State University of New York at Albany and the University of Texas Health Science Center at Houston. ANOMALOUS IMAGES http://www.anomalous-images.com <A HREF="http://www.ctrl.org/";>www.ctrl.org</A> DECLARATION & DISCLAIMER ========== CTRL is a discussion & informational exchange list. Proselytizing propagandic screeds are unwelcomed. Substance—not soap-boxing—please! These are sordid matters and 'conspiracy theory'—with its many half-truths, mis- directions and outright frauds—is used politically by different groups with major and minor effects spread throughout the spectrum of time and thought. That being said, CTRLgives no endorsement to the validity of posts, and always suggests to readers; be wary of what you read. CTRL gives no credence to Holocaust denial and nazi's need not apply. Let us please be civil and as always, Caveat Lector. ======================================================================== Archives Available at: http://peach.ease.lsoft.com/archives/ctrl.html <A HREF="http://peach.ease.lsoft.com/archives/ctrl.html";>Archives of [EMAIL PROTECTED]</A> http:[EMAIL PROTECTED]/ <A HREF="http:[EMAIL PROTECTED]/";>ctrl</A> ======================================================================== To subscribe to Conspiracy Theory Research List[CTRL] send email: SUBSCRIBE CTRL [to:] [EMAIL PROTECTED] To UNsubscribe to Conspiracy Theory Research List[CTRL] send email: SIGNOFF CTRL [to:] [EMAIL PROTECTED] Om
