That's why, if something happens that instinctively alarms us, the older reptilian brain will activate various "fight or flight" responses such as an increased heart rate, even if our cognitive brains tell us there is nothing to worry about. However, the older "reptilian brain" is still a powerful force in regulating our bodies. It is also crucial to cognitive considerations when faced with various sensory inputs. The neocortex is crucial to how humans process and retain memories, particularly during sleep. However, as day-to-day survival became easier for a large portion of the human population, other parts of the brain, in particular, the neocortex, developed. Burnett begins with "how the brain regulates the body, and usually makes a mess of things." He notes that in early humans, the brain functioned similar to the brain of a reptile, regulating our body to ensure survival and nothing else. The book was shortlisted for Goodreads' Science and Technology Book Award. The Idiot Brain: A Neuroscientist Explains What Your Head is Really Up To (2016), a non-fiction science/self-help book by Welsh neuroscientist and author Dean Burnett, seeks to explain nightmares, motion sickness, and other brain-based conundrums through rigorous scientific inquiry.
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