Around here in the clinton community college psychology classes, the plattsburgh state psychology classes and in varouis mental health agencies the two words - "mental" and "psychological" are siynonyms of each other meaning the two words mean the same thing - having to do with the mind, being carried out in the mind with out being accompanied by physical actions ie thinking about getting a drink but not physically getting a drink., the problem is how the person thinks the glass of water contains poison when in reality the water contains no poison, not about their hands shake when they pick up the glass because they have parkinsons disease.