Cognitive psychologists emphasize that we see what we want to see: we are all prisoners of the mental maps we create. Once a trader forms an opinion, he or she is more likely to overweight information consistent with this view than information that is contradictory. In one behavioral finance experiment, subjects have the opportunity to offer an item for sale. In one condition, the subjects have won that item in a contest. In the other condition, the subjects price the item for sale, but it hasn't been given to them. As you might guess, the subjects who owned the item demanded much more money for the item than those who had no ownership. It was the same item: only the fact of ownership made it valuable. So it is with our market opinions: once we own it, we overvalue it.
Other studies suggest that we see only what we expect to see, and thus become blind to new realities -- much like the Florida sellers.
Laurence Gonzales, in his fascinating book "Deep Survival: Who Lives, Who Dies, and Why", describes a research study from Harvard psychologists. They showed people a film of basketball players passing the ball to each other. During the film, a man in a gorilla costume walks into the middle of the action and stays visible on the screen for about five seconds. One group of subjects was asked to count the number of passes among the players; the other group was simply asked to watch the film. Incredibly, 56% of the subjects who counted the passes didn't ever see the gorilla. Of course, everyone asked to simply watch the film noticed the gorilla man on the basketball court.
The point is that the brain is a kind of search engine: a Googler of reality. If we program our search to look for passes among basketball players, that's the output we receive from the brain. What is extraneous to our search (gorillas) is eliminated. When we conduct a broad search, we receive a wider range of outputs. Focused searches work well if we're looking for a specific item, such as lost car keys. They don't work so well when we need to process all of the information needed to survive in an environment of risk and uncertainty.
It is very easy to approach the markets in focused search mode. We develop a hypothesis about the market (bullish or bearish) and we prime ourselves to look for certain chart patterns or indicator readings. In our haste to find what we're looking for, we can miss the gorillas in the market. Afterwards, we might look back on market action and think, "How in the *^#@ could I have missed that??!!"
Gonzales writes, "The practice of Zen teaches that it is impossible to add anything more to a cup that is already full. If you pour in more tea, it simply spills over and is wasted. The same is true of the mind. A closed attitude, an attitude that says, 'I already know', may cause you to miss important information. Zen teaches openness. Survival instructors refer to that quality of openness as 'humility'. In my experience, elite performers, such as high-angle rescue professionals, who risk their lives to save others, have an exceptional balance of boldness and humility..." (p. 91).
Gonzales has provided a concise formula for trading success: boldness and humility. The exemplary trader has the boldness to act with conviction, and the humility to realize that what is apparent may not be all that is there.