How You React When Startled Is a Window Into Your Soul
The startle reflex evolved to protect the body, but it also reveals your thoughts and feelings.
by Michael Graziano
Apr 17, 2018
4 minutes
To understand the expressive range of the human face, nothing beats watching a colleague scream his head off in slow motion. When my lab began to study protective reflexes in the early 2000s, the video cameras came out and the place became a scare factory. Graduate students took to lurking in hidden corners and lunging out with Velociraptor shrieks. Sundry plastic bugs and a pair of taxidermized monkey arms found their way inside the lunch refrigerator. I confess, I once took a cow eyeball from a dissection class, wrapped it in foil, and gave it to a colleague as a chocolate truffle.
By filming the reactions and reviewing the videos frame by frame, we began to realize that the
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