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Summary: Visual search for arbitrary objects in real scenes
Jeremy M. Wolfe & George A. Alvarez &
Ruth Rosenholtz & Yoana I. Kuzmova &
Ashley M. Sherman
# Psychonomic Society, Inc. 2011
Abstract How efficient is visual search in real scenes? In
searches for targets among arrays of randomly placed
distractors, efficiency is often indexed by the slope of the
reaction time (RT) × Set Size function. However, it may be
impossible to define set size for real scenes. As an
approximation, we hand-labeled 100 indoor scenes and
used the number of labeled regions as a surrogate for set
size. In Experiment 1, observers searched for named objects
(a chair, bowl, etc.). With set size defined as the number of
labeled regions, search was very efficient (~5 ms/item).
When we controlled for a possible guessing strategy in
Experiment 2, slopes increased somewhat (~15 ms/item),
but they were much shallower than search for a random
object among other distinctive objects outside of a scene
setting (Exp. 3: ~40 ms/item). In Experiments 46,
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