Under Sansar Chand's stimulus artists began to portray every situation involving Krishna, the cowherd.

He realises no definite future, he is content with the present; he cannot work for a purpose other than the pleasure of the moment; without this stimulus concentration is impossible.

It starts from the zero of consciousness, and it becomes more intense as the stimulus increases (though at a slower rate) up to the point when the stimulus is so strong as to begin to damage the nerve apparatus.

The relations of this new body to any stimulus proceeding from outside would be those of the external laws of Nature; but its relation to the spiritual ego working from within would be that of a plastic substance to be molded at will.

instinct, brute instinct, stimulus-response loop, conditioned response, instinctive reaction, Pavlovian response.

The instinct itself he analyzed into three elements: a specific stimulus-sensation, an emotion following, all ending in a particular course of muscular reaction.