Final answer:
Manic depressive psychosis is an outdated term that refers to bipolar disorder, a mood disorder marked by swings between manic and depressive episodes.
Step-by-step explanation:
The term 'manic depressive psychosis' (MDP) is actually an outdated term for what is now known as bipolar disorder. Bipolar disorder is characterized by dramatic shifts in mood, ranging from manic highs to depressive lows, which affect an individual's energy levels and ability to function. This condition is classified as a mood disorder, not a personality disorder or subtype of schizophrenia, and it is very distinct from neurological conditions like Parkinson's disease. Treatment for bipolar disorder typically involves a combination of medication and psychotherapy to manage the symptoms. Bipolar disorder is a mood disorder characterized by extreme mood swings between manic episodes (periods of abnormally high energy and mood) and depressive episodes (periods of intense sadness and low energy).