Collocations for stimulus - noun

great, major, powerful, strong | negative, positive | external | initial | auditory, intellectual, sensory, verbal, visual

act as, give, provide | react to, respond to

come from sth
The initial stimulus came from a letter in the newspaper.

~ for
The very act of lying down in bed should provide a strong stimulus for sleep.

~ to
A reduction in corporate tax should act as a stimulus to economic activity.

(in) response to a stimulus