Efficient visual search by category: Specifying the features that mark thedifference between artifacts and animals in preattentive vision

Citation
Dt. Levin et al., Efficient visual search by category: Specifying the features that mark thedifference between artifacts and animals in preattentive vision, PERC PSYCH, 63(4), 2001, pp. 676-697
Citations number
67
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Psycology
Journal title
PERCEPTION & PSYCHOPHYSICS
ISSN journal
0031-5117 → ACNP
Volume
63
Issue
4
Year of publication
2001
Pages
676 - 697
Database
ISI
SICI code
0031-5117(200105)63:4<676:EVSBCS>2.0.ZU;2-O
Abstract
In this report, we explored the features that support visual search for bro adly inclusive natural categories. We used a paradigm in which subjects sea rched for a randomly selected target from one category (e.g., one of 32 lin e drawings of artifacts or animals in displays ranging from three to nine i tems) among a mixed set of distracters from the other. We found that search was surprisingly fast. Target present slopes for animal targets among arti facts ranged from 10.8 to 16.0 msec/item, and slopes for artifact targets r anged from 5.5 to 6.2 msec/item. Experiments 2-5 tested factors that affect both the speed of the search and the search asymmetry favoring detection o f artifacts among animals. They converge on the conclusion that target-dist racter differences in global contour shape (e.g., rectilinearity/curvilinea rity) and visual typicality of parts and form facilitate search by category . We argue that existing theories are helpful in understanding these findin gs but that they need to be supplemented to account for the specific featur es that specify categories and to account for subjects' ability to quickly locate targets representing heterogeneous and formally complex categories.