Steven Yantis is in the Department of Psychological and Brain Sciences, Johns Hopkins University, 3400 N. Charles St., Baltimore, Maryland 21218, USA. yantis@jhu.edu
Voluntarily paying attention to one object in a crowded scene enhances perception of that object and increases the activity of neurons representing it. Attention can also be drawn involuntarily by salient objects—for example, by the sudden onset of a bright stimulus. A study now shows how this involuntary type of attention may mediate competition between representations in human visual cortex.
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