When gamers play games for hours at a time, their eyes start seeing elements of games in real life. This is called cognitive afterimage. The same is true of our way of looking at things in general. In his book, The Happiness Advantage, Shawn Accor describes The Tetris Effect.
Tetris effect is our brain getting used to seeing things in a certain way. We see whatever we focus on and miss everything else (watch the famous gorilla experiment 🦍 on youtube to see this in action) and what we focus on is determined by what we are used to focussing on. It's not just that people interpret a scenario differently, it's as if they have actually seen two different things.
The good news is, we can train ourselves to gain a positive Tetris effect. Eric Kendall, a neuroscientist, won the Nobel Prize in 2000 for discovering how the brain changes physically with learning. This ability to change the wiring in our brain with practice is called Neuroplasticity. London Cabbies have unusually large hippocampi because their brains overuse their spatial intelligence. They aren't born with it, their brains physically change as they think and learn more routes and lanes around the maze that is London.
We can make happiness, gratitude and optimism our goto reactions which ensure we are less cynical and more curious about opportunities that surround us. There is scientific proof that an old dog can learn new tricks. Very loosely speaking, this is the growth mindset that people talk about.