Which of the following is NOT one of the seven distinct mental abilities proposed by Thurstone?

Mateo is 70 years old and had a stroke last year. He is now unable to remember how to get to and return from his new doctor's office using a specific route. The brain structure that was potentially damaged by the stroke was the ________

a) amygdala b) hypothalamus c) hippocampus d) cerebellum

In an experiment, a researcher manipulates one variable to see how it affects a second variable. The second variable, which is observed for any possible effects, is called the __________

a. dependent variable b. control variable c. independent variable d. hypothetical variable