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Tracking an object through feature space
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DOI：10.1038/35041567.png)
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摘要
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Visual attention allows an observer to select certain visual information for specialized processing. Selection is readily apparent in 'tracking' tasks where even with the eyes fixed, observers can track a target as it moves among identical distractor items(1). In such a case, a target is distinguished by its spatial trajectory. Here we show that one can keep track of a stationary item solely on the basis of its changing appearance-specified by its trajectory along colour, orientation, and spatial frequency dimensions-even when a distractor shares the same spatial location. This ability to track through feature space bears directly on competing theories of attention, that is, on whether attention can select locations in space(2-4), features such as colour or shape(5-7), or particular visual objects composed of constellations of visual features. Our results affirm, consistent with a growing body of psychophysical(8-13) and neurophysiological(14-16) evidence, that attention can indeed select specific visual objects. Furthermore, feature-space tracking extends the definition of visual object(17) to include not only items with well defined spatio-temporal trajectories(18), but also those with well defined featuro-temporal trajectories.
Keyword:
VISUAL-SEARCH
ATTENTIONAL MODULATION
TRANSPARENT MOTION
PERCEPTION
COLOR
DISCRIMINATION
INFORMATION
INTEGRATION
SELECTION
CAPACITY
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期刊
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48.5
论文数:
1.8W
被引数:
96.5W
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