Mood, thoughts and fears were once considered to be outside the realm of neuroscience.
Residing deep within the brain's center are a group of closely associated structures most noted for governance of emotion, sensation and motivation. These structures are collectively referred to as the “limbic system.”
To thoroughly understand how the human nervous system functions, you'll need to also know something about its structure, which is referred to as neuroanatomy. Human behaviors are rooted in neuroscience.
If you like the idea of teaching part-time, being an adjunct professor might be something that you'd enjoy. The requirements needed to become an adjunct professor include a graduate degree in any field of interest, preferably a doctorate.