Interference with bottom-up feature detection by higher-level object recognition.
26 - 31.
Drawing portraits upside down is a trick that allows novice artists to reproduce lower-level image features, e.g., contours, while reducing interference from higher-level face cognition. Limiting the available processing time to suffice for lower- but not higher-level operations is a more general way of reducing interference. We elucidate this interference in a novel visual-search task to find a target among distractors. The target had a unique lower-level orientation feature but was identical to distractors in its higher-level object shape. Through bottom-up processes, the unique feature attracted gaze to the target [1-3]. Subsequently, recognizing the attended object as identically shaped as the distractors, viewpoint invariant object recognition [4, 5] interfered. Consequently, gaze often abandoned the target to search elsewhere. If the search stimulus was extinguished at time T after the gaze arrived at the target, reports of target location were more accurate for shorter (T < 500 ms) presentations. This object-to-feature interference, though perhaps unexpected, could underlie common phenomena such as the visual-search asymmetry that finding a familiar letter N among its mirror images is more difficult than the converse . Our results should enable additional examination of known phenomena and interactions between different levels of visual processes.
|Title:||Interference with bottom-up feature detection by higher-level object recognition|
|Keywords:||LATERAL OCCIPITAL COMPLEX, INFERIOR TEMPORAL CORTEX, VISUAL-SEARCH, STRIATE CORTEX, AREA V4, REPRESENTATION, ATTENTION, SHAPE, FAMILIARITY, INTEGRATION|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
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