http://scienceblogs.com/neurophilosophy … rieval.php

"... Activity in the hippocampus is therefore closely correlated with the eye movements associated with retrieval of relational memories, even in the absence of conscious awareness. Implicit and explicit memory retrieval also appear to be correlated with distinct brain activation patterns. The authors suggest that their findings could have far-reaching implications. It is possible that eye-tracking could be used to investigate memory function in infants, or to obtain information about past events from those who might be unwilling to recall them, or are unable to. Schizophrenics, for example, often exhibit memory deficits, and Hannula has already used memory-related eye-movements to show that they have difficulty noticing small changes in a previously learned scene."