Additive and interactive effects of spatial attention and expectation on perceptual decisions

被引:12
|
作者
Zuanazzi, Arianna [1 ]
Noppeney, Uta [1 ]
机构
[1] Univ Birmingham, Computat Cognit Neuroimaging Lab, Computat Neurosci & Cognit Robot Ctr, Birmingham B15 2TT, W Midlands, England
来源
SCIENTIFIC REPORTS | 2018年 / 8卷
关键词
CORTICOSPINAL EXCITABILITY; REPETITION SUPPRESSION; AUDIOVISUAL LINKS; PROBABILITY; PREDICTION; RESPONSES; CORTEX; TIME; CUE;
D O I
10.1038/s41598-018-24703-6
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Spatial attention and expectation are two critical top-down mechanisms controlling perceptual inference. Based on previous research it remains unclear whether their influence on perceptual decisions is additive or interactive. We developed a novel multisensory approach that orthogonally manipulated spatial attention (i.e. task-relevance) and expectation (i.e. signal probability) selectively in audition and evaluated their effects on observers' responses in vision. Critically, while experiment 1 manipulated expectation directly via the probability of task-relevant auditory targets across hemifields, experiment 2 manipulated it indirectly via task-irrelevant auditory non-targets. Surprisingly, our results demonstrate that spatial attention and signal probability influence perceptual decisions either additively or interactively. These seemingly contradictory results can be explained parsimoniously by a model that combines spatial attention, general and spatially selective response probabilities as predictors with no direct influence of signal probability. Our model provides a novel perspective on how spatial attention and expectation facilitate effective interactions with the environment.
引用
收藏
页数:12
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