At the very least, Tony has a greater innate fear of Impending Space Horror than most Avengers, making this an important early telegraph of what's eventually to come. (gamesradar.com)
The rat has an unconditioned innate fear of shocks, but it can be conditioned to be afraid of tones if the two are associated with each other. (discovermagazine.com)
In line with this notion, some investigators report higher cyst density in amygdalar regions known to be involved in innate fear [6], although this has been challenged by others [32]. (journals.plos.org)