Interesting insights are more likely to come from studying the original work rather than a second-hand account of it. Secondary sources such as review articles are best used to obtain references to the primary literature, which you then consult directly. You want to demonstrate your ability to review and organize scholarly material, not someone else's. Some judgement must be used in deciding whether an item requires a reference. If you are uncertain, either check with your professor or err on the side of excessive acknowledgement.
Psychologists study human behavior.
A person can be considered a type of machine. It is dishonest to claim course credit more than once for the same work. In addition, it deprives you of the opportunity of researching and gaining knowledge on different topics, one of the aims of a college education. ANY paper can benefit from the comments of another reader before the work is submitted. Nevertheless, you should ensure that this process of critical review does not go beyond generally acceptable limits to the point where an unacknowledged individual makes a significant contribution to your work.