==Review== 
 Nice work on a very broad topic. I have a few suggestions for improvement. I'd like to see you elaborate a bit more on the details of the "Types of Stimuli" section. For example, what are the absolute threshold values for the five senses for humans? You could also list specific receptor types for the various stimuli, such as pain receptors. I think you should also note the regions of the brain involved in the specific kinds of sensations. Great job hyperlinking to other articles and Wikipedia; your article flows well. Be sure to proofread your article, I noticed there are some errors in capitalization and comma use: "In the nervous system, internal and external stimuli can elicit two different categories of responses: an excitatory response, normally in the form of an Action Potential, and an inhibitory response." Action potential should not be capitalized here. Overall, good job! -   

 ==Peer Review==