Object detection and basic-level categorization: Sometimes you know it is there before you know what it is

A tight temporal coupling between object detection ( is an object there? ) and object categorization ( what kind of object is it? ) has recently been reported (Grill-Spector & Kanwisher, 2005), suggesting that image segmentation into different objects and categorization of those objects at the b...

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Bibliographic Details
Published in:Psychonomic bulletin & review 2008-02, Vol.15 (1), p.28-35
Main Authors: Mack, Michael L., Gauthier, Isabel, Sadr, Javid, Palmeri, Thomas J.
Format: Article
Language:English
Subjects:
Attention
Behavioral Science and Psychology
Biological and medical sciences
Brief Reports
Cognitive Psychology
Discrimination Learning
Eyes & eyesight
Field Dependence-Independence
Fundamental and applied biological sciences. Psychology
Humans
Orientation
Pattern Recognition, Visual
Perception
Perceptual Distortion
Perceptual Masking
Psychology
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychophysics
Reaction Time
Set (Psychology)
Vision
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Summary:A tight temporal coupling between object detection ( is an object there? ) and object categorization ( what kind of object is it? ) has recently been reported (Grill-Spector & Kanwisher, 2005), suggesting that image segmentation into different objects and categorization of those objects at the basic level may be the very same mechanism. In the present work, we decoupled the time course of detection and categorization through two task manipulations. First, inverted objects were categorized significantly less accurately than upright objects across a range of image presentation durations, but no significant effect on object detection was observed. Second, systematically degrading stimuli affected categorization significantly more than object detection. The time course of object detection and object categorization can be selectively manipulated. They are not intrinsically linked. As soon as you know an object is there, you do not necessarily know what it is.
ISSN:1069-9384
1531-5320
DOI:10.3758/PBR.15.1.28