Psychology
Noun
しんり
ねこの心理を思うがままにあやつれるようになりたい。
I want to be able to manipulate cats' minds as much as I want.
春人以外の男どもには、女せいのせんさいな心理は分からないんだよ。
Men, with the exception of Haruto, don't understand the delicate psychology of women.
サーモンと彼女に翻弄される人々の心理を、君の小説で描いてみてもらえないかな？人気が出ると思うんだけど。
Can you depict the mental state of Salmon and those she deceives in your novel? I think people would love it.
The reasoning that your heart makes 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.