期刊
JOURNAL OF NEUROSCIENCE
卷 38, 期 44, 页码 9486-9504出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.0623-18.2018
关键词
action selection; attention; conflict; midfrontal theta; motor cortex; visual cortex
资金
- Universite Catholique de Louvain Fonds Speciaux de Recherche
- Belgian National Funds for Scientific Research FRS-Fonds National de la Recherche Scientifique [MIS F.4512.14]
- Fondation Medicale Reine Elisabeth
- Marie Sklodowska Curie co-fund Grant - Fonds National de la Recherche Scientifique
- Fonds National de la Recherche Scientifique Grant
- INNOVIRIS
Many behaviors require choosing between conflicting options competing against each other in visuomotor areas. Such choices can benefit from top-down control processes engaging frontal areas in advance of conflict when it is anticipated. Yet, very little is known about how this proactive control system shapes the visuomotor competition. Here, we used electroencephalography in human subjects (male and female) to identify the visual and motor correlates of conflict expectation in a version of the Eriksen Flanker task that required left or right responses according to the direction of a central target arrow surrounded by congruent or incongruent (conflicting) flankers. Visual conflict was either highly expected (it occurred in 80% of trials; mostly incongruent blocks) or very unlikely (20% of trials; mostly congruent blocks). We evaluated selective attention in the visual cortex by recording target- and flanker-related steady-state visual-evoked potentials (SSVEPs) and probed action selection by measuring response-locked potentials (RLPs) in the motor cortex. Conflict expectation enhanced accuracy in incongruent trials, but this improvement occurred at the cost of speed in congruent trials. Intriguingly, this behavioral adjustment occurred while visuomotor activity was less finely tuned: target- related SSVEPs were smaller while flanker-related SSVEPs were higher in mostly incongruent blocks than in mostly congruent blocks, and incongruent trials were associated with larger RLPs in the ipsilateral (nonselected) motor cortex. Hence, our data suggest that conflict expectation recruits control processes that augment the tolerance for inappropriate visuomotor activations (rather than processes that downregulate their amplitude), allowing for overflow activity to occur without having it turn into the selection of an incorrect response.
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