by Eryn Leister and Austin Funk
Fixed Ratio: You have a math test every Friday worth 50 points. The reinforcer is the 50 points.
Variable-Ratio: Shooting 100 free throws in a row. The reinforcer is shooting the baskets.
Fixed-Interval: Every night at 12:00 the church bells ring. The reinforcer is the bells ringing.
Variable-Interval: driving to a party but getting stuck in traffic on the way. The reiforcer is driving to the party.