Differences b/w Sec 84 and Sec 85 of Indian Penal Code in relation to Criminal Responsibility

Main m problem hai, abhi main MH CET Law paper 1 ki paper solve kar raha hoon, to aapko lagta hai meri confusion hai. Kya yeh sahi hai ki Sec 84 IPC ka concept of abnormally formed mind and Sec 85 IPC ka concept of unsound mind dono hi criminal responsibility se alag karte hain? Lekin dono ke liye court kaise decide karega ki koi bhi shikaarpurna mind hai ya naa hai? Abhi maine padha hai ki Section 84 ka scope hai shikaarpurna mind ki situation, phir bhi Section 85 ka kya connection hai?