noun

stimulus

STIM-yuh-lus/ˈstɪmjələs/

Something that prompts a response or increases activity.

The bell is a stimulus that makes the cat turn its ears.

A cat instantly turning its ears toward a ringing small bell, bell clearly provoking response.

Etymology

Latin stimulus was a pointed stick used to goad animals, and figuratively an incitement. The same image underlies something that spurs an organ, mind, or other system into activity.

In context

Plainly Difficult408:04

this would be done by introducing a neutral stimulus like a rabbit with a scary stimulus for example from a loud banging sound

ReWind: Year 5 Omnibus of Plainly Difficult

More examples

Bright light is a stimulus that causes your pupils to shrink.
The new rail line provides a stimulus for local business.
For many students, curiosity is a powerful stimulus to learning.

Forms

stimulus · stimuli

stimulate verb — To prompt a response or increase activity.

stimulation noun — The act of encouraging activity or response.

Similar words

trigger: A trigger sets off a particular response, often suddenly.
incentive: An incentive encourages action by offering a benefit or reward.
impetus: Impetus gives an activity momentum rather than causing a specific response.