1. Here is an example of reckless behavior associated with a lack of fear as it pertains to humans taking anti-fear drugs.
[1] http://news.nationalpost.com/news/there-was-no-fear-anymore-...
And then there are studies of animals changing their behavior to be more reckless. I am curious to see your thoughts on correlation of animal and human testing.
[2] https://med.stanford.edu/news/all-news/2011/03/scientists-di...