Experimental control programs for the UNIX operating system

The software described runs on Version 7 UNIX, although most run on earlier versions. Using the curses package requires two program libraries from the Fourth Berkeley Distribution (CURSES and TERMLIB). Using any of the functions requires knowledge of programming, preferably in C (Kernighan & Richie, 1978), but the sample experimental control program is usable by nonprogrammers. Because no special hardware is assumed, the resolution of timed presentations and reaction time recordings may not be accurate enough for some purposes. Functions for stimulus presentation have a resolution of 1 sec, and those for timing responses are accurate to about 17 msec.