Middle Ground in Psychology

As I was doing the reading for homework, it mainly focused around neurons and the Nervous System. It talked about how neurons function and how they cross the synapses sending signals to different muscles around the body. It also brought up many interesting points about how different medicines can affect the nervous system in the body. I was so surprised to see how different drugs can become so needed in the body and become an addiction to many people. However, I believe that there is some middle ground where the biology and theories meet to form a stronger sense of psychology. The biology definitely makes an impact on how we act as people, but we have to consider everyone is different. People all have different interest and situations that can also influence the way they act. This has formed my idea behind that there is a mix of the science of psychology but also life experiences that make you act the way you do. I could always be wrong, thoughts?