Response Marker : 4-Button

The RPD-400 4-Button Response pad is a four channel hand-held, push button switch. It connects to the digital input connector of the IX-TA-220 or the IX-RA-834. When any of the four buttons are pressed, the RPD-400 delivers a TTL pulse on the corresponding digital Input. Using this response marker, an experimental subject is able to indicate a response chosen from up to four alternatives..