I think combining psychology and neuroscience is a great mix of information because when you begin to learn about the brain especially the frontal lobe which is considered the emotional control center that " involves the motor function, problem solving, spontaneity, memory, language, initiation, judgement, impulse control, and social and sexual behavior." As psychologist you will be able to assess why the patient has mental disorders or challenges that interrupt their lives. As well as a "Neuroscientists studies the development and function of the nervous system, which includes the brain, spinal cord, and nerve cells throughout the body. They could specialize in one part of the nervous system, such as neurotransmitters, or focus their research on specific behaviors, such as psychiatric disorders."
I think you should look at both majors and see if their are any courses that fit for both majors. When I was a biology major in college I also took psychology courses that helped me to understand characteristics of various diseases and integrated treatment protocol that assisted in a persons rehab.
Good Luck !!