Neurophysiological evidence for enhanced top-down control in processing of homogeneous contexts T Feldmann-Wüstefeld, A Schubö |
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Cognitive Neuroscience of Perception & Action, Philipps-University Marburg, Germany
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| There is an ongoing debate to what extent irrelevant salient information attracts an observer’s attention and is processed without the observer intending to do so or whether volitional control can be very efficient already at an early point in visual processing. In the present experiment we used behavioral measures and event-related potentials in an additional singleton paradigm to show that the relative contribution of top-down and bottom-up processing depends on the homogeneity of the context stimuli are embedded in. Results indicated faster and more pronounced attention allocation for targets in more homogeneous contexts. In addition, we found delayed active suppression of salient distractors in less homogeneous contexts. In sum the present results suggest that top-down control of attention is stronger the more homogeneously stimuli are arranged. |
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