[benmathes]

Some of the earliest work that Kahneman and Taversky (think behavioral economics or biases) stumbled upon that told them the brain was filtering/processing unconsciously and incorrectly was hearing focus. Different people would be able to recall strings of numbers played into each ear at varying levels of ability. The better you were at picking up more input streams, the better a bus driver, fighter pilot, or tank captain you would be.