This unit uses solid state relays to prevent high frequency noise from causing false triggering of the analog circuitry, as can happen with solenoid relays. This two clock, reaction timer has been designed to measure reaction and movement time. When a stimulus is displayed, the subject releases one telegraph key and presses the second key. The difference of the two times allows movement time to be measured. With this task, the subject is required to select one of three telegraph keys when a centrally located stimulus is activated.
Reaction time is displayed on the control s millisecond timer.
With this system, the experimenter can select the stimulus type, response mode, stimulus delay, and method of stimulus initiation. The set includes a control box, subject box with three telegraph keys and central stimulus display, dual-channel voice relay, remote push button, and slide viewer. A correct response can be a telegraph key, a push button, or a vocalization. The stimulus can be initiated with a vocalization, a push button, or the initiate button on the control panel. The delay between the ready light and stimulus onset can be varied from 1 to 10 seconds.