What was Dr. Zimbardo's role in the Stanford Prison Experiment?

Brittany practices mediation because she read research that it lowers her blood pressure and improves her mood and well-being. Her friend who is taking psychology suggests Brittany should consider

a. that research proves the benefits of meditation. b. sampling bias and placebo effects might be affecting the research results. c. the danger of increasing depression when meditating. d. all of these.

The "hole" in the retina where the optic nerve leaves the eye forms an area known as the __________

Fill in the blank(s) with correct word