Crossword-Solution: INGRAINED 9 letters, 27 clues 🏆 scrabble score: 11

Humans are born with a hodge-podge of various brain circuits, that possess the seeds of peace, fear, love, hate, rage, pain, love, stress and faith. All these elements compose the emotional domain of our mental life. All these characters are ingrained in our limbic system, that keep our head straight in the path of survival. We humans can survive, only if, all these elements of our brain circuits function properly. Failure of any one element would mean extinction of the whole species.

We all have that inner fear of the dark, no matter how old we get. It's an ingrained instinct to fear the velvety blackness of the night, of things you can't quite see, but know deep down in your bones is there, waiting.

There were many human groups that did not go to war; the Eskimos never grasped the idea at all, and the American Indians never took to it well. But these dissenters were wiped out, and a cultural pattern was established that became the standard for the whole planet. Now it has become ingrained in us.