What operates on the pleasure principle and constantly seeks immediate and unrestrained satisfaction?

In the three-level hierarchy of mental ability, group factors are:

A) middle-level abilities similar to Thurstone's primary mental abilities. B) top-level factors similar to Spearman's g. C) middle-level abilities similar to Spearman's s. D) third-level factors similar to Thurstone's primary mental abilities.

If Dr. Johnson wanted to isolate where dopamine receptors were located in the brain, she would use __________.

A. methylene blue stain B. immunocytochemistry C. confocal laser scanning microscopy D. cresyl violet stain