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Selective processing of superimposed objects: an electrophysiological analysis of object-based attentional selection
T A Weber1, A F Kramer, G A Miller
1Department of Psychology, University of Illinois at Urbana-Champaign, Beckman Institute, Urbana 61801, USA.
Biological Psychology
|March 21, 1997
Summary
Object-based attentional selection is spatially mediated, even with overlapping objects. Reaction times and brain responses show faster processing when target features belong to the same object versus different objects.
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Psychology
Background:
- Visual selective attention models propose mechanisms for prioritizing stimuli.
- Distinguishing between object-based and spatially-invariant attentional selection is crucial for understanding visual processing.
Purpose of the Study:
- To investigate if object-based attentional selection operates on grouped-array or spatially-invariant representations.
- To determine the role of spatial mediation in object-based attention, especially with superimposed objects.
Main Methods:
- Participants judged color/shape conjunction presence on same vs. different objects.
- Measured reaction times (RTs) and accuracy.
- Recorded event-related potentials (ERPs), specifically P1 and N1 components, using target objects and a spatial attention probe.
Main Results:
- Faster RTs and higher accuracy were observed in the same-object condition compared to the different-object condition.
- ERP components (N1 to targets, P1 to probes) differentiated between same and different object trials when objects were superimposed.
- These findings support object-based selection models.
Conclusions:
- Object-based attentional selection is spatially mediated, even when objects overlap.
- Visual attention can prioritize information based on objecthood, utilizing spatial mechanisms.