Final answer:
Dr. Kushner's request for informed consent adheres to the Belmont Report's principle of respect for persons, which requires treating participants as autonomous agents and providing protection for those with diminished autonomy.
Step-by-step explanation:
When Dr. Kushner asks his participants to provide informed consent for his study on the effects of sleep deprivation on cognitive performance, he is adhering to the principle of respect for persons. This principle is one of the core tenets of the Belmont Report, which outlines ethical guidelines for conducting research involving human subjects. It emphasizes that participants must be treated as autonomous agents and that those with diminished autonomy are entitled to protection. The process of obtaining informed consent implies giving participants adequate information about the study, ensuring that they comprehend it, and assuring that the participation is voluntary.