scholarly journals Form, set organization and visual attention in illusory contours perception

Psihologija ◽  
2009 ◽  
Vol 42 (2) ◽  
pp. 239-254 ◽  
Author(s):  
Vasilije Gvozdenovic
Keyword(s):  
Visual Search ◽  
Visual Attention ◽  
Experimental Psychology ◽  
Illusory Contours ◽  
Target Figure ◽  
Simple Detection ◽  
The Way

Laboratory of Experimental Psychology, University of Belgrade The aim of the study was the investigation of form, spatial set organization and visual attention in visual search of illusory contours. Three visual search experiments were conducted. In the first experiment, where the simple detection procedure was used, subject's task was to detect square among vertical and horizontal lines. Other experiments investigated visual search of illusory contours in four different set organizations. Introduction of set organization was the way of manipulation of target's eccentricity among other elements. Analysis showed different type of search of the regular and the illusory square figure. The search profile of the regular square proved to be parallel, while all the searches of the illusory squares remained serial. Set organization had important role in visual search of illusory contours. Regardless of serial profile, visual search was faster in cases where target figure was more salient due to the background elements organization.

scholarly journals Visual search of illusory contours: an attempt of automatization

Psihologija ◽  
2008 ◽  
Vol 41 (3) ◽  
pp. 295-309 ◽  
Author(s):  
Vasilije Gvozdenovic
Keyword(s):  
Visual Search ◽  
Experimental Research ◽  
Experimental Psychology ◽  
Illusory Contour ◽  
Task Type ◽  
Parallel Search ◽  
Illusory Contours ◽  
Serial Search ◽  
Experimental Trials ◽  
And Task

Laboratory of Experimental Psychology, University of Belgrade Recent research, which was mostly focused on assessing the types of visual search of illusory contours, showed that visual search is dependent on factors like target configuration and task type. Some experimental research supports the theory of parallel search while other research supports the theory of serial search of illusory contours. The inconsistency is most likely due to the fact that various types of illusory contour configurations were used in set creation. Up to this point, our research indicated that the serial search is used in most cases. Some exceptions of search type have been proven in some modification of task type but nevertheless the search profile remained serial. In this article, we are reporting on two visual search experiments. The first experiment was an investigation of a specific feature of a Kanisza type illusory triangle, orientation. The validity of the profile defined in the first experiment was tested in our second experiment with an attempt to automatize the visual search by the multiplication of the initial experimental trials. Our results confirmed that, regardless of the number of experimental trials, the visual search profile remains serial.

scholarly journals Visual attention in spatial cueing and visual search

2021 ◽  
Vol 21 (3) ◽  
pp. 1
Author(s):  
Jongsoo Baek ◽  
Barbara Anne Dosher ◽  
Zhong-Lin Lu
Keyword(s):  
Visual Search ◽  
Visual Attention ◽  
Spatial Cueing

scholarly journals Exogeneous Spatial Cueing beyond the Near Periphery: Cueing Effects in a Discrimination Paradigm at Large Eccentricities

Vision ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 13
Author(s):  
Katharina Weiß
Keyword(s):  
Visual Field ◽  
High Resolution ◽  
Visual Attention ◽  
Experimental Psychology ◽  
Discrimination Task ◽  
Empirical Knowledge ◽  
Spatial Cueing ◽  
Vision Science ◽  
Head Mounted Displays

Although visual attention is one of the most thoroughly investigated topics in experimental psychology and vision science, most of this research tends to be restricted to the near periphery. Eccentricities used in attention studies usually do not exceed 20° to 30°, but most studies even make use of considerably smaller maximum eccentricities. Thus, empirical knowledge about attention beyond this range is sparse, probably due to a previous lack of suitable experimental devices to investigate attention in the far periphery. This is currently changing due to the development of temporal high-resolution projectors and head-mounted displays (HMDs) that allow displaying experimental stimuli at far eccentricities. In the present study, visual attention was investigated beyond the near periphery (15°, 30°, 56° Exp. 1) and (15°, 35°, 56° Exp. 2) in a peripheral Posner cueing paradigm using a discrimination task with placeholders. Interestingly, cueing effects were revealed for the whole range of eccentricities although the inhomogeneity of the visual field and its functional subdivisions might lead one to suspect otherwise.

scholarly journals Age-related changes in visual search: manipulation of colour cues based on cone contrast and opponent modulation space

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Shuto Tamura ◽  
Keiko Sato
Keyword(s):  
Visual Search ◽  
Visual Attention ◽  
Reaction Times ◽  
Visual Space ◽  
Preliminary Evidence ◽  
Human Lens ◽  
Search Performance ◽  
Older Individuals ◽  
Colour Perception ◽  
Age Related

AbstractReduced retinal illuminance affects colour perception in older adults, and studies show that they exhibit deficiencies in yellow-blue (YB) discrimination. However, the influence of colour cues on the visual attention in older individuals remains unclarified. Visual attention refers to the cognitive model by which we prioritise regions within the visual space and selectively process information. The present study aimed to explore the effect of colour on visual search performance in older observers. In our experiment, younger observers wearing glasses with a filter that simulated the spectral transmittance of the aging human lens and older observers performed two types of search tasks, feature search (FS) and conjunction search (CS), under three colour conditions: red-green, YB, and luminance. Targets and distractors were designed on the basis of the Derrington–Krauskopf–Lennie colour representation. In FS tasks, reaction times changed according to colour in all groups, especially under the YB condition, regardless of the presence or absence of distractors. In CS tasks with distractors, older participants and younger participants wearing glasses showed slower responses under chromatic conditions than under the achromatic condition. These results provide preliminary evidence that, for older observers, visual search performance may be affected by impairments in chromatic colour discrimination.

scholarly journals The eye movements of dyslexic children during reading and visual search: Impact of the visual attention span

2007 ◽  
Vol 47 (19) ◽  
pp. 2521-2530 ◽  
Author(s):  
Chloé Prado ◽  
Matthieu Dubois ◽  
Sylviane Valdois
Keyword(s):  
Visual Search ◽  
Eye Movements ◽  
Visual Attention ◽  
Attention Span

The degree of human visual attention in the visual search

2000 ◽  
Vol 4 (2) ◽  
pp. 57-61 ◽  
Author(s):  
Hiroaki Mizuhara ◽  
Jing-Long Wu ◽  
Yoshikazu Nishikawa
Keyword(s):  
Visual Search ◽  
Visual Attention ◽  
Human Visual Attention

Grapheme–Color Synesthesia Influences Overt Visual Attention

2009 ◽  
Vol 21 (2) ◽  
pp. 246-258 ◽  
Author(s):  
Jonathan S. A. Carriere ◽  
Daniel Eaton ◽  
Michael G. Reynolds ◽  
Mike J. Dixon ◽  
Daniel Smilek
Keyword(s):  
Visual Search ◽  
Eye Movements ◽  
Visual Attention ◽  
Eye Tracking ◽  
Search Task ◽  
Visual Search Task ◽  
Free Viewing ◽  
Colored Target

For individuals with grapheme–color synesthesia, achromatic letters and digits elicit vivid perceptual experiences of color. We report two experiments that evaluate whether synesthesia influences overt visual attention. In these experiments, two grapheme–color synesthetes viewed colored letters while their eye movements were monitored. Letters were presented in colors that were either congruent or incongruent with the synesthetes' colors. Eye tracking analysis showed that synesthetes exhibited a color congruity bias—a propensity to fixate congruently colored letters more often and for longer durations than incongruently colored letters—in a naturalistic free-viewing task. In a more structured visual search task, this congruity bias caused synesthetes to rapidly fixate and identify congruently colored target letters, but led to problems in identifying incongruently colored target letters. The results are discussed in terms of their implications for perception in synesthesia.

The effects of script on visual search

1987 ◽  
Vol 3 (2) ◽  
pp. 102-113 ◽  
Author(s):  
David Green ◽  
Paul Meara
Keyword(s):  
Visual Search ◽  
Search Strategy ◽  
Native English Speakers ◽  
Spanish Speakers ◽  
English Speakers ◽  
Native Spanish Speakers ◽  
Chinese Speakers ◽  
English Orthography ◽  
Letter Search ◽  
The Way

Native English speakers search short strings of letters differently from the way they search strings of nonalphanumeric symbols. Experiment 1 demonstrates the same contrast for native Spanish speakers. Letter search, therefore, is not a result of the peculiarities of English orthography. Since visual search is sensitive to the nature of the symbols being processed, different scripts should produce different effects. Experiments 2 and 3 confirmed such differences for Arabic and Chinese scripts. Furthermore, these experiments showed no evidence that native Arabic and native Chinese speakers adapt their search strategy when dealing with letters. Implications of these findings are considered.

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