names and affiliations : Matthew

نویسندگان

  • Matthew A. Bennett
  • Philip A. Duke
  • Giorgio Fuggetta
چکیده

Event-Related Potential (ERP) studies using delayed match-to-sample tasks have demonstrated the presence of two components, N270 and N400, possibly reflecting the sequential processing of multiple sources of endogenous mismatch. To date, studies have only investigated secondary sources of mismatch between a single cue and target. In this study, we used distractor stimuli to investigate the effect of a secondary source of mismatch distinct from the task relevant stimulus. Subjects performed such a task in two paradigms in which the cue and target could match or mismatch – producing a source of task-relevant endogenous mismatch. In the second paradigm, task-irrelevant distractors were added-producing an additional, distinct source of irrelevant perceptual mismatch. A mismatch-triggered negativity was elicited in both paradigms, but was delayed and enhanced in magnitude in the distractors present paradigm. It is suggested that the distractors may differentially affect mismatch responses through the generation of an automatic but task-irrelevant mismatch response.

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تاریخ انتشار 2016