"Anything irrational and instinctive has its roots in evolutionary biology."

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"Anything irrational and instinctive has its roots in evolutionary biology."

I have had this wild hypothesis for a while now. Behaving irrationally is not as irrational as it seems.

For more than 99% of our million years on earth, we lived in savannahs and jungles. In such a world, survival is determined by your ability to not get killed. Anything that increased our chances of survival stuck around. The traits necessary to survive got biologically wired into our brains over millions of years.

Biologically, our design is much more suited to surviving in savannahs than thriving in the post-Industrial Revolution world.

[1] Heuristics and Biases: The Brain's Shortcuts

In a world full of constant threats, using cognitive processing for every decision was not only resource-intensive and inefficient but also slow. Imagine being about to be attacked by a tiger and thinking about your next move. Not so smart!

Our brain developed shortcuts - heuristics and biases. These are fast, efficient, and took control unless the slower, more rational part kicked in. Think of them as the brain’s quick fixes, even if they sometimes lead us astray.

[2] Social Acceptance: The Ultimate Groupthink

Staying in groups was crucial for survival. This led to our genes craving social acceptance. Our ancestors thrived in tightly-knit communities, leading to behaviors like peer pressure and herd mentality. Today, fitting in can seem irrational, but it's our evolutionary survival strategy at play.

[3] Fight or Flight: Ancestral over reaction to any stress

The fight-or-flight response is a classic example. This automatic reaction was crucial for ancestors facing predators. Today, it’s triggered by things like public speaking or work stress—situations far less deadly but still invoking that primal rush.

[4] Loss Aversion: Better Safe Than Sorry

Loss aversion, our tendency to avoid losses over acquiring gains, stems from ancient times when losing resources could mean death. Today, this manifests in cautious financial decisions, often making us irrationally risk-averse.

[5] Fear of the Unknown: Primal Anxiety

Fear of the unknown is rooted in evolutionary biology. For early humans, unfamiliar environments often posed threats. Today, this manifests as anxiety about new experiences or resistance to change—irrational, yet deeply ingrained.

Understanding where our behaviors come from is crucial for making smarter decisions. But let's face it: while we like to think our rational brain is running the show, it's really the irrational part that's the star.

So, next time you act irrationally, don't be too hard yourself. Blame your ancestors! They've worked hard on perfecting these 'skills' for a million years—good luck undoing that in a few hundred.

Some useful links in the comments.