REGULATORY STIMULI and NON REGULATORY STIMULI?

please compare the two and give example for better understanding. i couldn't find their meaning and i want to explain it to my classmates.
THANKS so much
Answers:
Go to these websites
http://www.ncbi.nlm.nih.gov/pubmed/17425…
http://www.science.smith.edu/exer_sci/ES…

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