Jean Piaget is noted for his theory of

Molecules of neurotransmitters attach to

a. presynaptic neurons. b. neurotransmitter receptors. c. ion transporters. d. other molecules of neurotransmitters. e. the synaptic cleft.

Researchers turn to correlational studies when

a. large groups of participants are involved. b. they are certain that participants can remember accurately what happened to them earlier. c. variables of interest cannot be altered by the researchers. d. communication with participants may be a problem. e. their hypotheses are causal in nature.