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All subjects began with the 3 blocks of superordinate categorization.
Their easy categorization is actually a superordinate categorization task with a search space restricted to one basic level category.
After them, 6 subjects performed the 3 blocks Dog0%A that use the same neutral non-animal photographs than in the superordinate categorization task to allow direct comparison.
are accessed faster than superordinate ones (animal, furniture).. Nevertheless, the speed at which objects presented in natural images can be processed in a rapid go/no-go visual superordinate categorization task has challenged this "basic level advantage".
In the superordinate categorization task, the scores (global accuracy: 94.8% and mean RT: 395 ms) reached by the group of 14 new subjects were similar to those reached by the group of 16 subjects tested in the preceding experiment (95.5% and 386 ms).
The visual system can quickly access a coarse/abstract visual representation that allows fast decision for superordinate categorization of objects but additional time-consuming visual analysis would be necessary for a decision at the basic level based on more detailed representations.
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It was found that superordinate categorizations were performed more quickly and differentiated from basic level categorizations in amplitude early in visual processing (320 420 ms).
Object/context congruency has also been shown to interfere with animal superordinate fast categorization [26].
More recently, experiments on rapid visual categorization at the superordinate level definitely challenged the traditional view.
In fast visual categorization tasks, object superordinate representation might even not be conscious.
Object categorization at the superordinate level might indeed be as fast as object detection, and this would explain why Grill-Spector and Kanwisher [1] found no processing speed difference.
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