Design of a computerized device to measure simple reaction time/decision time

The construction and validation of a computerized device to test simple reaction time and decision-making time is discussed. The device is required to demonstrate repeatability (consistency of response times from human subjects) across replications of the same experimental condition. A second requirement of the device is that it must separately and independently measure simple reaction time and the time it takes to process one bit of information. The concepts behind the construction of the box are discussed, as well as the design of its internal circuits to achieve these specifications.