| Tom Campbell |
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Cognitive Brain Research Unit, Department of Psychology, PO BOX 13 (Meritullink. 1) 00014 University of Helsinki
e-mail: tom.campbell@cbru.helsinki.fi |
Poster Presentation: |
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| TOKEN SET SIZE AND THE IRRELEVANT SOUND EFFECT: EVIDENCE FOR THE N1 HYPOTHESIS. |
| Tom Campbell(a), István Winkler(a,b), Teija Kujala(a) and Risto Näätänen(a) |
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(a) Cognitive Brain Research Unit, University of Helsinki; (b) Institute for Psychology, Hungarian Academy of Sciences |
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| This study examined how increases in the number of different types of sound within a sequence (token set size), that was ignored, influenced brain activity and how this influences immediate memory performance on a concurrent task. Event-related potentials were recorded when participants performed a serial recall task that required remembering lists of visually-presented numbers that were followed by a distractor-filled retention interval. The results showed that increments in set size from 2 to 5 elicited a right frontal-temporal negativity and parietal positivity, together with a significant disruptive advantage not shown with increments in set size from 1 to 2. This result supports the N1 hypothesis that these facets of the refractoriness of the N1 component mediate the disruption produced by irrelevant sound. |
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