Investigating task-dependent top-down effects on overt visual attention
Autor(en): | Betz, Torsten Kietzmann, Tim C. Wilming, Niklas Koenig, Peter |
Stichwörter: | bottom-up features; COLOR; computational modeling; CONTRIBUTE; EYE-MOVEMENTS; FEATURES; LUMINANCE-CONTRAST; Ophthalmology; overt visual attention; SALIENCY; SCENES; SHIFTS; task-dependent behavior; top-down effects | Erscheinungsdatum: | 2010 | Herausgeber: | ASSOC RESEARCH VISION OPHTHALMOLOGY INC | Journal: | JOURNAL OF VISION | Volumen: | 10 | Ausgabe: | 3 | Zusammenfassung: | Different tasks can induce different viewing behavior, yet it is still an open question how or whether at all high-level task information interacts with the bottom-up processing of stimulus-related information. Two possible causal routes are considered in this paper. Firstly, the weak top-down hypothesis, according to which top-down effects are mediated by changes of feature weights in the bottom-up system. Secondly, the strong top-down hypothesis, which proposes that top-down information acts independently of the bottom-up process. To clarify the influences of these different routes, viewing behavior was recorded on web pages for three different tasks: free viewing, content awareness, and information search. The data reveal significant task-dependent differences in viewing behavior that are accompanied by minor changes in feature-fixation correlations. Extensive computational modeling shows that these small but significant changes are insufficient to explain the observed differences in viewing behavior. Collectively, the results show that task-dependent differences in the current setting are not mediated by a reweighting of features in the bottom-up hierarchy, ruling out the weak top-down hypothesis. Consequently, the strong top-down hypothesis is the most viable explanation for the observed data. |
ISSN: | 15347362 | DOI: | 10.1167/10.3.15 |
Zur Langanzeige
Seitenaufrufe
3
Letzte Woche
0
0
Letzter Monat
0
0
geprüft am 15.05.2024