Ratio strain.

2. Explain ratio strain. How were you able to avoid ratio strain to reach VR50? What progression did you use? Did you run into any difficulty? 3. How does the response rate (slope of cumulative record) change as the value of the VR-schedule increases? 4. Thought question: How would the behavior look different if we were testing rats on a fixed interval schedule? What would happen if we increased from an FI5 to an FI50s?