CONCURRENT FIXED-RATIO FIXED-INTERVAL PERFORMANCES IN ADULT HUMAN SUBJECTS

Two undergraduate males worked for money on a button‐pressing task associated with concurrent fixed‐ratio fixed‐interval schedules of reinforcement. Manipulations of the fixed‐ratio requirement produced an interaction between the various fixed‐ratio and fixed‐interval performances. When the fixed ratio was small, more fixed‐interval responding occurred per interval than when the fixed ratio was large. In general, the data were similar to those obtained with lower organisms except that no post‐reinforcement pause or ratio strain was seen. 1969 Society for the Experimental Analysis of Behavior