I did a Google search for "algae causing cognitive impairment," and found quite a few articles. They tested it on mice and looked for people who had the virus.
This article looks pretty good:
http://news.sciencemag.org/biology/2014 ... n-activityHere is part of the article
Quote:
The cognitive effects were small, notes Joram Feldon, a neuroscientist emeritus at the Swiss Federal Institute of Technology in Zurich who was not involved with the work. He praises the finding for being innovative, but says “if you ask me if I am worried about the existence of this virus, I am not.”
Allan Kalueff, the director of the ZENEREI Institute in Slidell, Louisiana, who was not involved with the work, suspects that other viruses may affect human sensory processing and behavior. He says he wonders whether these results indicate that there may be health risks to workers in the seafood industry or who work around water where they may be exposed to this algal virus. "But we clearly need more studies, including both animal and plant/algal studies."