Two brain parts appear to work in tandem for purposeful behavior to occur... The frontal cortex, part of the cerebral area, and the basal ganglia, which is part of the limbic system. In this article from Scientific American, a man sinks to the bottom of a pool, and cannot seem to muster the motivation to swim back to the top. He is content to drown, and after being saved from dewoning by his daughter, reports remembering being aware he was in grave danger, but he was simply unable to will himself to do anything about it.
http://www.sciam.com/article.cfm?id=drowning-mr-m
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