I Believe this misrepresents the situation. The 60bit capacity was determined by assessing the concious ability to determine if a string of letters was a word or not. And the author of this experiment and study, Moscoso del Prado, has clarified that this is NOT an upper limit.
The brain recieves and processes >10 Billion bits worth of information every second, the vast majority of which is processed subconciously, or autonomically.
Our brains are not smearing out detail in an effort to find variation.