Most young adolescents, especially those who receive a formal high school education, are at the level of thinking that Piaget described as:

In the retina, amacrine cells:

a. Connect photoreceptors to horizontal cells b. Help combine information from adjacent ganglion cells c. Connect rods with cones d. Are not found in the fovea

A neurosurgeon successfully removes the left hemisphere of the brain in a small child with severe epilepsy. Contrary to previous surgical results, the child is able to recover use of the right side of her body

This is an example of how single-case design (or perhaps a case study) can a) refute a universal assumption b) generalize to other populations. c) increase reliability of research findings. d) utilize repeated measures.