This is a non-fiction book based on Kahneman's scientific research. In the book, Kahneman conveys his idea that there are two primary perceptional systems in order to comprehend the brain.
The two main modes which he called system one and system two. System one works automatically and unconsciously. We use it to read easy sentences, solve simple math problems, or perceive objects as fit into a category.
It is not good for us to rely on system one. System one has biases, and it causes errors in our decisions. Sometimes we read a complicated sentence, and we find a substitute for easier meaning for hard ones without any additional thought.
System two is liable for human thoughts and functions that seek consideration. We use it to solve reasoning, puzzles, and difficult problems. It helps us to concentrate on something.
System two of our brain needs more effort, but human being tends to be indolent, therefore we depend on system one.
The second section of the book explains about biases in math calculations. Our brain faces difficulties when we study Statistics. Mostly, we do not understand Statistics small samples, that shows our dependency on system one.
At the end of the book, the writer talks about overconfidence. Commonly people do believe in their instinct. Many times, we do not know what is going to happen. Kahneman called it Hindsight Illusion. The writer describes the importance of bias and mind perception. It helps our mind to know about situations in which we often make errors.
