You know, the Yale Rat story is interesting, but I think it is important to note that the Rat did not really just choose a random direction to turn.
The setup for the experiments states that the "random" food placement was weighted to put food to the left 60% of the time, so it was not purely a case of "always turning left" made the rat win more than the students in a PURELY RANDOM situation. It was "random", but rigged such that the food was slightly more likely to appear on the left. And it was that small fact that "allowed" the rat to beat the students.
The article even says that the Rat LEARNED that he had a better chance of getting food if he went to the left. So, it was not a case of the rat just willy-nilly deciding he was a "left-turning" rat at birth.
Meanwhile, the HUMANS might have also realized (at some level) that food came up on the left slightly more often - which is why they tried to establish some kind of pattern or rules to follow (like 2 rights are followed by 3 lefts - or whatever).
How is that any different from us humans establishing "rules" to govern how we trade the random market that say, for example, a green candle, followed by a red candle, followed by another red candle that breaks lower than the low of the previous red candle is a "valid signal" that the RED Rats are going to get fed?
Isn't the "Rat Reversal" system (or any system) still exactly the same human-thought-process that made the Yale students "lose" against the rats?
Now, some might say that the "rat reversal" rules are using a candle configuration to establish which direction has that "60% edge" over the other - but in actuality, the market is still RANDOM, so aren't you're still using a YALE Brain when you think that the price action on the previous two candles plus the current candle gives you an "edge"?
Either the market is truly random and therefore no amount of number crunching on statistics will really help, or it isn't random and has some level of order or rationality and therefore "predictability" to it.
You have to decide which you believe, I suppose.