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Saydrah · 4827 days ago · link · · parent · post: Human neurons in the right amygdala react intensely and immediately to images of animals.
If you're looking for sheer brain activity, I think nothing beats encountering a large predator close up. There are a few options for diving tours with basking sharks, which are quite gentle but still terrifying to your monkey brain.
Oh yeah, this would get the inner monkey screaming: http://en.wikipedia.org/wiki/File:Basking_Shark.jpg And yet, they look a bit dopey. :)
Wow, they have been around since the Oligocene. That's ~34 MYA! http://en.wikipedia.org/wiki/Basking_shark -Far older than this brain.