Distribution of human response times

Human response time (RT) is defined as the time delay between a signal and the starting point of human action. For example, one can measure time interval from a word appearing on a computer screen to when a participant pushes a keyboard button to indicate his or her response. Two well established empirical facts of RT are the power law tails of RT distributions [1] and 1/f noise of RT time series [2–5], to which any theoretical description must conform.