How do educational psychologists define "stimulus"?

How do educational psychologists define "stimulus"?

Louis Pugliese (Lecturer in Educational Psychology, CSUN, Certified by the National Board for Professional Teaching Standards) gives expert video advice on: What conditions stimulate learning?; How can I help my child be more motivated in the classroom? and more...

A stimulus is any information that comes to us through the five senses that could be the sense of touch, the sense of smell, the hearing, the sight and then the brain processes those stimuli in a way that organizes them either based on what we already know or based on the novelty, the new information, that we strive to reconcile with what we already know