Catatonia is a response related to people's fears, it may not be on purpose but it still happens. The author addresses this and thinks it may be an evolutionary condition programmed into the human body. I think this is true because why else would humans choose to become immobile for long periods of time, especially in times that may be critical to survival. The evidence the author provides includes the deer in a headlight example, this may be similar to the human reaction. I think this document heavily supports the idea that catatonia is a biologically programmed function in the human brain. Humans are mammals and are therefore susceptible to all or most primal instincts. I think catatonia likely developed as a way for animals to defend themselves,
