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1.  Repetition of letter strings leads to activation of and
connectivity with word-related regions  Neuroimage 
2011;59(3):2839-2849. Individuals learn to read by gradually
recognizing repeated letter combinations. However, it is unclear
how or when neural mechanisms associated with repetition of
basic stimuli (i.e., strings of letters) shift to involvement of
higher-order language networks. The present study investigated
this question by repeatedly presenting unfamiliar letter strings
in a one-back matching task during an hour-long period.
Activation patterns indicated that only brain areas associated
with visual processing were activated during the early period,
but additional regions that are usually associated with semantic
and phonological processing in inferior frontal gyrus were
recruited after stimuli became more familiar. Changes in
activation were also observed in bilateral s