You might be susceptible to “tickle attacks,” but have you ever wondered why you can’t tickle yourself?

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Sources:

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0063441
https://www.ncbi.nlm.nih.gov/pubmed/24270589
https://www.ncbi.nlm.nih.gov/pubmed/16157489
https://www.ncbi.nlm.nih.gov/pubmed/10943682
https://www.ncbi.nlm.nih.gov/pubmed/26891191
https://pdfs.semanticscholar.org/cca2/c6449d671da77256b600f8b3de15637c6f47.pdf
http://www.npr.org/templates/story/story.php?storyId=248041246&ft=1&f=1007