Top-down control of feature-based attention recently became the focus of attentional research. The present study propose to examine how top-down control of feature-based attention selects relevant information and suppress irrelevant information with presence of significant distraction. Multiple paradigms including visual search, attentional blink, spatial blink and dual-tasks paradigm will be used to answer the following questions: (1) What kind of visual features can involuntarily capture attention？ （2）How can attention be guided by multiple target defining features? (3) How does contingent capture interact with stimulus-driven capture of attention? (4) Is contingent capture truly automatic? (5) How long it takes to switch from one attentional control setting to another？ This study will not only improve our understanding of top-down control of attention but also help us identify important source of distraction, thus promoting efficient human-computer interaction.
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