Event-related potential N270 delayed and enhanced by the conjunction of relevant and irrelevant perceptual mismatch

• Published in: Psychophysiology Vol. 51; no. 5; pp. 456 - 463
• Main Authors: Bennett, Matthew A., Duke, Philip A., Fuggetta, Giorgio
• Format: Journal Article
• Language: English
• Published: United States Blackwell Publishing Ltd 01.05.2014
• Subjects: Adolescent; Adult; Conflict (Psychology); Conflict negativity; Cues; Event-related potential; Evoked Potentials - physiology; Female; Humans; Male; Mismatch; N270; N400; Photic Stimulation; Physiological psychology; Psychomotor Performance - physiology; Selective attention; Serial processing; Visual Perception - physiology; Visual task performance; Young Adult; Event-related potential; Selective attention; N400; N270; Serial processing; Mismatch; Conflict negativity
• ISSN: 0048-5772; 1540-5958; 1469-8986
• DOI: 10.1111/psyp.12192

Event‐related potential 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 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 two paradigms in which the cue and target could match or mismatch. In one paradigm, task‐irrelevant distractors were added—producing a source of task‐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 a task‐irrelevant mismatch response.