During a typical morning, Colin will check the clock more frequently as the time for his regularly scheduled lunch break approaches. In this case, Colin's clock checking behavior is reinforced on a schedule.

Fixed interval schedule

Explanation: A fixed interval schedule means that reinforcement becomes available after a specific period of time or Fixed Interval Schedule involve reinforcing a behavior after an interval of time has passed.

if you are on the computer you can not take a picture but you can upload one but i am not sure about phones but i'm pretty sure it's the but to upload one just click the paper clip looking thing/ link thingy thing and upload a pic