On the first trial, a rat in a Skinner box is reinforced for the first bar press it makes after 50 seconds have elapsed. On the second trial, the first bar press after 70 seconds is reinforced. Although it varies from trial to trial, the average works out to one reinforcer every 60 seconds. The rat is on a schedule of reinforcement.

Which of the following statements most accurately describes the requirement for the documentation of minors’ assent to participate in research? parents must approve written documentation. documentation is required unless waived by an irb. to protect minors documentation is always required. federal regulations do not require the documentation of minors’ assent.