Answer:
An excess or distortion of normal functions.
Step-by-step explanation:
Positive simply means addition in psychology, so in schizophrenia positive symptoms are those that increase behavior or cause behavior. Positive symptoms would include hallucinations, delusions, and hyperactivity.
Negative symptoms simply mean to "take away"-- such as catatonic states where the person stays in a frozen position for long stretches of time, or the flat effect where they are unable to express or feel much emotion in relation to the environment around them.
I hope this helps, and sorry for the late response.