“I had a sudden impulse to tell the woman pouring the wine that I loved her.”
“We must heed our natural impulse for self-preservation, according to our proper nature.”
“The bright blue or violet glow, with its distinct hissing and buzzing sound, unnerved the herd and served as the impulse for them to bolt.”
impulsion
The act of impelling or driving onward, or the state of being impelled; the sudden or momentary agency of a body in motion on another body; also, the impelling force, or impulse.