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Using magnetoencephalography, a technique that measures the weak magnetic fields given off by a thinking brain, researchers have found that higher-rated chess players are more likely to engage the frontal and parietal cortices of the brain when they look at the board, which suggests that they are recalling information from long-term memory. Lower-ranked players are more likely to engage the medial temporal lobes, which suggests that they are encoding information. The experts are interpreting the present board in terms of their massive knowledge of past ones. The lower ranked players are seeing the board as something new...[de Groot] argued that expertise in the field of shoemaking, painting, building, or confectionary, is the result of the same accumulation of experiential linkings. According to Erikson, what we call expertise is really just vast amounts of knowledge, pattern-based retrieval, and planning mechanisms acquired over many years of experience in the associated domain. In other words, a great memory isn't just a byproduct of expertise; it is the essence of expertise. Whether we realize it or not, we are all like those chess masters and chicken sexers- interpreting the present in light of what we've learned in the past and letting our previous experiences shape not only how we perceive our world, but also the moves we end up making in it... Our memories are always with us, shaping and being shaped by the information flowing through our senses in a continuous feedback loop. Everything we see, hear, and smell is inflected by all the things we've seen, heard, and smelled in the past...Who we are and what we do is fundamentally a function of what we remember.
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Joshua Foer (Moonwalking with Einstein: The Art and Science of Remembering Everything)