how is the thalamus the sensor regulator for the brain (what are the steps that happen when it receives a stimuli?
I searched Google under the key words "thalamus and stimuli" to get these possible sources:
http://www.google.com/search?client=safari&rls=en&q=thalamus+and+stimuli&ie=UTF-8&oe=UTF-8
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.