In search for the relevant space of implicit memory deficit in dyslexia


Studies of dyslexics, whose implicit memory is impaired, suggest that their implicit inference of sound statistics and its integration into perception is inefficient. Specifically, dyslexics' implicit memory decays faster and consequently only accumulates information over shorter temporal windows. We now ask whether this abnormal dynamic is domain general by measuring its cortical distribution. We measure the dynamics of behavioral context effects and the concurrent neural adaptation during fast acquisition fMRI. We find a similar pattern of fast decay of adaptation across a broad range of cortical areas, though most significant effects are found in auditory cortex. This broad neural distribution suggests that the relevant aspect of implicit statistical inferences is not the nature of stimuli, but their temporal distribution.

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