I want to be able to manipulate cats' minds as much as I want.
Men, with the exception of Haruto, don't understand the delicate psychology of women.
Can you depict the mental state of Salmon and those she deceives in your novel? I think people would love it.
The reasoning of your heart decides what you do. Probably when kanji was being made people thought that the heart directed our actions, not our brains. So, if you think about it that way, the reasoning of your heart is your mental state. Nowadays that's known as psychology.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.