Fourth, can effectively control the experiment in the computer during the psychological experiments according to the requirements of the main trial, the manipulated variable of the various parameters to produce different experimental conditions, which can control a variety of instruments, so that they follow certain sequentially output to various stimuli. were tested according to the response in the shortest time possible in a variety of select an appropriate stimulation, presented in front of the test stimulus changes continuously compared to other experimental apparatus is a computer important advantage, as only by the researchers themselves are impossible to complete such a complex task.