[chki]

To me the connection between performing multitasking and therefore loosing your ability to memorize things is not at all obvious. And for it to be obvious (I think) one would probably need to know a lot more about the brain than we currently do.

I mean: your example of a triathletes doing a sprint might be true (although a triathlete is probably still a lot better at that than an untrained individual). But there it is easy to see a connection (different muscle mass, different exercises to know what to do in a sprint). But why should there be a similar connectivity between different brain functions?