Fill in the Blank
-Fixed-Interval (FI) Schedule of Reinforcement $\bullet$ A Reinforcer Is Contingent On

Short Answer

Fill in the Blank
-Fixed-interval (FI) schedule of reinforcement
$\bullet$ A reinforcer is contingent on
$\bullet$ the _________________________
$\bullet$ after a fixed interval of time
$\bullet$ since the last opportunity for reinforcement.