Why Your True Nature Is Hidden From You
Our behavior can arise from the hidden math of evolution, not lived experience.
Posted May 26, 2026 | Reviewed by Jessica Schrader
Do you surprise yourself, reacting emotionally to a colleague or family member more strongly than seems rational? Do you occasionally observe your own behavior and wonder why you just did what you did, even though you’ve tried many times to avoid that behavior? Or do you not do things that you’d repeatedly sworn to yourself you would do?
If your answer is "yes," welcome to the human race. At one time or another, we all observe our emotions, thoughts, and behaviors and go, “Huh?”
There are multiple reasons why it occasionally seems that we are passive spectators of our own feelings and behaviors, rather than active drivers of them. One is that a particular behavior may require ultra-fast pre-conscious or unconscious processing. For example, a golf swing or the production of speech, where we lack the time to think about what each muscle should be doing while swinging a club or to consciously form individual words in every sentence.
Another reason we surprise ourselves is that we store away so many experiences in our lifetimes that shape our perceptions and reactions that we can’t remember all of them. But an unconscious part of our brain aggregates and stores the meanings of those experiences, especially those that are emotionally charged. Thus, when a new situation arises, such as meeting a new co-worker, we are apt to feel drawn to or repelled by that person for reasons we can’t pinpoint based on many previous experiences with other people. One such mechanism is implicit learning [1] where we learn without being aware that we’re learning, like knowing that someone has suddenly come up behind us on a busy street by the sound shadow their nearby body casts.
But fast, unconscious responses and those arising from implicit learning aren’t the only sources of emotions and behaviors that catch us by surprise. Whereas highly repetitive tasks and implicit knowledge are acquired after birth, our brains have knowledge acquired millions of years before our birth. And it is precisely because we weren’t present when that ancient learning occurred, that behaviors and emotions emerging from those ancestral experiences can seem to come out of nowhere.
How ancient probabilities shaped modern brains to respond in strange ways
Evolutionary biologists and psychologists assert that perception, emotion , and behavior are heritable traits on the same level as body parts. For instance, our bodies evolved vocal cords that would be useless without parallel evolution of the mental ability to comprehend and produce speech.[2]
And all heritable traits survive or disappear based upon the remorseless math of survival and reproduction: perceptions, emotions and behaviors that, on average, favored survival and reproduction of healthy offspring persisted; those that didn’t vanished. Social bonding , sexual attraction , jealousy , disgust at human waste, and affinity for high-calorie food are just a few examples of emotions and behaviors evolution hard-wired into us because, statistically, they helped our ancestors survive and reproduce.[2]
The problem is, our brains evolved into their current form 50,000 years ago, when our ancestors were hunter-gatherers struggling to survive in ultra-dangerous environments, while most modern people do not face daily life-or-death struggles. This creates a mismatch between hard-wired programs in our brains and modern reality. So we sometimes act like stone-aged hunter-gatherers that have been time-warped into the present… and surprise ourselves when we observe a stone-aged persona controlling our life in ways that make little sense [2].
Here are examples of reactions arising from evolution, not lived experience
Why being aware that we have unlearned “knowledge” can make us happier
Some of the ancient mental adaptations, such as feelings of disgust to noxious odors just mentioned, still make sense. But due to the mismatch between the stone-aged environment that shaped these adaptations and modern life, many of the mental adaptations have not only outlived their usefulness but have become counterproductive. Being aware of that can make us happier.
Here are three examples, using the analogy of animals in our environment to speak to the ancient, but immensely powerful part of our brain that thinks in terms of lethal predators vs. bothersome pests vs. tasty prey animals.
Attaining happiness with a stone-aged brain in a digital world
The voices of a thousand distant ancestors constantly whisper in our heads: our happiness can depend upon knowing when to listen to those voices and when to ignore them.
1 Seger, C. A. (1994). Implicit learning. Psychological Bulletin, 115 (2), 163–196. https://doi.org/10.1037/0033-2909.115.2.163
2 Cosmides, L., & Tooby, J. (2013). Evolutionary psychology: New perspectives on cognition and motivation. Annual Review of Psychology, 64 , 201–229. https://pubmed.ncbi.nlm.nih.gov/23282055/
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Eric Haseltine, Ph.D ., is a neuroscientist and the author of Long Fuse, Big Bang.
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This article is part of the Bringwise Psychology Journal — daily insights on human behavior, mental health, and personal growth.