A more direct investigation of stimulus encoding during stimulus
repetition can be achieved by using a “roving standard paradigm”,
where memory-traces are forced to reset after each train of repeated
features is presented first identified a positive deflection at fronto-central sensors in
the ERP of standard sounds that increased with increasing number of
repetitions. This modulation termed repetition positivity (RP) spans
between 50 and 250 ms post-stimulus and greatly contributes to the
“MMN memory trace effect