Inhibition,
25, 54-55, 78, 83-84, 122-125, 248, 257, 263, 314, 382, 384, 429-430, 528, 540
Initiative,
545
Insane,
269, 508-609
Insight in learning,
316-320
Instinct,
105-116, 137-169, 179, 181, 488-489, 492, 513, 554;
criteria of, 92, 97, 138;
and emotion, 134-135;
modification of, 299-301