Dive into the rabbit hole on Wikipedia.

What is Priming?

Priming describes the effect of how exposure to some impressions may subconsciously influence your decision-making or thinking. Here is a commonly known example of priming: What color do clouds have? White. What color do (most) sheep have? White. What is the main color of the Japanese flag? White. What do cows drink? Milk. The correct answer would have been water, but making you think about white things primes your brain to search for white options when given a question. So you’ll likely answer milk instead of water when being asked what cows drink. A more concealed way might be using certain words several times with a certain severity, serving no real purpose. Then asking you to pick a random number between 1 and 10. Take a second to come up with one; you’ll find my guess by expanding the detail section. Priming can also be used to prepare your brain for certain situations. Getting into bed will prime your brain for sleeping; sitting down at your desk primes it for work.

Your random number between 1 and 10 is…

3. You might have opted for 7 as well, but if you paid some attention, you’ll have noticed that I suddenly used some words starting with “se…”, which is a rather obvious attempt at priming you. So, you might’ve tried to outsmart me, picking some number that isn’t 7. That’s why I provided 3 examples for both the white-milk and the “se…” words each. I also gave myself a statistical edge, as 7 and 3 are the most commonly picked “random” numbers. Veritasium has a nice video on this if you’d want to learn more about why 3 and 7 are the most commonly picked “random” numbers (YouTube|Invidious).