How can no change in an auditory stimulus generate an N2b-P3a?
Brain Cogn
; 129: 9-15, 2019 02.
Article
em En
| MEDLINE
| ID: mdl-30579632
ABSTRACT
The purpose of this study was to investigate the occurrence of an endogenously-evoked no-go N2b. Previous literature focused on the N2b being evoked by exogenous auditory stimuli. In this study, no-go stimuli were the absence of a gap in a 1000-ms noise burst (i.e., no-gap trials). ERPs were measured from 35 participants while performing a gap-detection task and passively listening to the same stimuli. Participants were asked to press a button when they heard a gap in the noise burst (go trials) and to withhold their button press when they did not perceive a gap in the noise burst (no-go trials). The current study's gap-detection task had predictable timing (gaps always occurred at 500â¯ms after noise burst onset) and high probability of gaps occurring (101); therefore, participants built up an expectancy that gaps would occur on most trials at 500â¯ms. For no-gap trials, this meant that a participant's expectancy was violated and thus a N2b-P3a response was generated. We found that all participants had N2b-P3a responses to no-gap trials. Overall, this study demonstrated that the no-go N2b-P3a response can be evoked by an endogenous signal in the form of the omission of an expected gap in noise.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Estimulação Acústica
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Potenciais Evocados P300
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Potenciais Evocados Auditivos
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Ruído
Limite:
Adolescent
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Adult
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Female
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Humans
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Male
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article