Exploring The Brain’s Internal Stopwatch

From pouring a glass of milk to typing a news article, precise timing–down to the thousandth of a second–is key to the brain’s control of movement. By studying how monkeys track a visual target, Javier Medina and his colleagues have gained new insights into the strategies that the brain uses to measure time.
http://www.sciencedaily.com/releases/2005/01/050106120112.htm