Denise Grady on nytimes.com:
A lifelong swimmer leapt into deep water near his lakeside home, and was horrified to find himself completely unable to swim. Had his wife not rescued him, he might have drowned.He had recently received an electronic brain implant to control tremors and other symptoms of Parkinson’s disease, and somehow the signals from the device had knocked out his ability to coordinate his arms and legs for swimming.
What the heck? Just one initial study, but interesting to see where the research leads.