scholarly journals Visual Search for Feature and Conjunction Targets with an Attention Deficit

1993 ◽  
Vol 5 (4) ◽  
pp. 436-452 ◽  
Author(s):  
Martin Arguin ◽  
Yves Joanette ◽  
Patrick Cavanagh
Keyword(s):  
Visual Search ◽  
Visual Attention ◽  
Attention Deficit ◽  
Feature Integration ◽  
Integration Theory ◽  
Target Orientation ◽  
Search Tasks ◽  
Attention Disorder ◽  
Feature Target ◽  
Marked Deficit

Brain-damaged subjects who had previously been identified as suffering from a visual attention deficit for contralesional stimulation were tested on a series of visual search tasks. The experiments examined the hypothesis that the processing of single features is preattentive but that feature integration, necessary for the correct perception of conjunctions of features, requires attention (Treisman & Gelade, 1980 Treisman & Sato, 1990). Subjects searched for a feature target (orientation or color) or for a conjunction target (orientation and color) in unilateral displays in which the number of items presented was variable. Ocular fixation was controlled so that trials on which eye movements occurred were cancelled. While brain-damaged subjects with a visual attention disorder (VAD subjects) performed similarly to normal controls in feature search tasks, they showed a marked deficit in conjunction search. Specifically, VAD subjects exhibited an important reduction of their serial search rates for a conjunction target with contralesional displays. In support of Treisman's feature integration theory, a visual attention deficit leads to a marked impairment in feature integration whereas it does not appear to affect feature encoding.

scholarly journals Perception of illusory contour figures: Microgenetic analysis

Psihologija ◽  
2004 ◽  
Vol 37 (4) ◽  
pp. 451-481 ◽  
Author(s):  
Vasilije Gvozdenovic
Keyword(s):  
Visual Search ◽  
Visual Attention ◽  
Illusory Contour ◽  
Feature Binding ◽  
Integration Theory ◽  
Search Tasks ◽  
Time Period ◽  
Priming Phase ◽  
Feature Integration Theory ◽  
Two Phases

Microgenetic analysis was used to investigate perception of illusory contour figures which represent whole, completed forms on the basis of segmented, incomplete stimulation. The analysis provided an experimental approach to this phenomenon which was standardly investigated phenomenologically. Experimental procedure consisted of two phases: a) priming phase and b) test phase which consisted of visual search task. Two types of visual search tasks were applied: (i) classic detection, in which subjects were detecting presence or absence of the target stimuli and (ii) two-alternative forced choice, 2AFC, in which subjects performed discrimination between two concurrent targets (target A vs. target B). Variation of exposition of prim stimuli was used as an indication of the percept formation period. Concepts like early vision, visual attention and feature binding were investigated. Four experiments were conducted. Their outcome showed that (i) perception of amodal figure requires visual attention, (ii) features binding precedes spatial attention and (iii) time period of percept formation is dependent of task properties and varies between 50 - 150 ms. Some results obtained in this research could be explained by feature-integration theory (Treisman & Gelade, 1980; Treisman, 1986). Furthermore, percept formation period data comply with data acquired in Elliott & M?ller's psychophysical research (1998).

scholarly journals Early vision and visual attention

Psihologija ◽  
2003 ◽  
Vol 36 (3) ◽  
pp. 241-254
Author(s):  
Vasilije Gvozdenovic
Keyword(s):  
Visual Search ◽  
Visual Perception ◽  
Visual Attention ◽  
Cognitive Processes ◽  
Feature Integration ◽  
Integration Theory ◽  
Early Vision ◽  
Scientific Approach ◽  
Feature Integration Theory

The question whether visual perception is spontaneous, sudden or is running through several phases, mediated by higher cognitive processes, was raised ever since the early work of Gestalt psychologists. In the early 1980s, Treisman proposed the feature integration theory of attention (FIT), based on the findings of neuroscience. Soon after publishing her theory a new scientific approach appeared investigating several visual perception phenomena. The most widely researched were the key constructs of FIT, like types of visual search and the role of the attention. The following review describes the main studies of early vision and visual attention.

Visual Search and the Older Adult: Not all is Lost

1995 ◽  
Vol 39 (2) ◽  
pp. 134-138
Author(s):  
Darryl G. Humphrey ◽  
Arthur F. Kramer ◽  
Donnelle R. Schneider
Keyword(s):  
Search Task ◽  
Visual Selective Attention ◽  
Feature Integration ◽  
Conjunction Search ◽  
Integration Theory ◽  
Search Tasks ◽  
Age Related ◽  
Feature Conjunction ◽  
Integration Mechanism ◽  
Feature Integration Theory

Plude and Doussard-Roosevelt (1989) reported age-related search slope differences in a conjunction search task but not in a feature search task. According to Feature Integration Theory (Treisman & Gelade, 1980), older adults may suffer an impairment in the feature integration mechanism required for conjunction searches. We extend this work by examining age-related differences a series of feature, conjunction, and triple conjunction search tasks. The results of the feature and conjunction search tasks support the previous findings. However, the results of the triple conjunction search task suggest that the conjunction search impairment is not universal. As the triple conjunction search results are difficult to accommodate within Feature Integration Theory, the results are discussed within the framework of the Guided Search model of visual selective attention.

scholarly journals Prospects for using visual search tasks in modern cognitive psychology

2020 ◽  
Vol 9 (2) ◽  
pp. 107-116
Author(s):  
E.S. Gorbunova
Keyword(s):  
Cognitive Psychology ◽  
Visual Search ◽  
Visual Attention ◽  
Target Stimulus ◽  
Real Life ◽  
Laboratory Studies ◽  
Search Tasks ◽  
Life Tasks ◽  
Standard Task

The article describes the main results of modern foreign studies with modifications of classical visual search tasks, as well as proposed classification of such modifications. The essence of visual search is to find target stimuli among the distracters, and the standard task involves finding one target stimulus, which is usually a simple object. Modifications to the standard task may include the presence of more than one target on the screen, the search for more than one type of target, and options that combine both of these modifications. Proposed modifications of the standard task allow not only to study new aspects of visual attention, but also to approach real-life tasks within laboratory studies.

scholarly journals Visual Search in 3D: Effects of Monoscopic and Stereoscopic Cues to Depth on the Validity of Feature Integration Theory and Perceptual Load Theory

2021 ◽  
Vol 12 ◽  
Author(s):  
Ciara M. Greene ◽  
John Broughan ◽  
Anthony Hanlon ◽  
Seán Keane ◽  
Sophia Hanrahan ◽  
...  
Keyword(s):  
Perceptual Load ◽  
Three Dimensional ◽  
Feature Integration ◽  
Integration Theory ◽  
Apparent Depth ◽  
Three Dimensional Objects ◽  
Load Theory ◽  
Search Tasks ◽  
Single Feature ◽  
Feature Integration Theory

Previous research has successfully used feature integration theory to operationalise the predictions of Perceptual Load Theory, while simultaneously testing the predictions of both models. Building on this work, we test the extent to which these models hold up in a 3D world. In two experiments, participants responded to a target stimulus within an array of shapes whose apparent depth was manipulated using a combination of monoscopic and stereoscopic cues. The search task was designed to test the predictions of (a) feature integration theory, as the target was identified by a single feature or a conjunction of features and embedded in search arrays of varying size, and (b) perceptual load theory, as the task included congruent and incongruent distractors presented alongside search tasks imposing high or low perceptual load. Findings from both experiments upheld the predictions of feature integration theory, regardless of 2D/3D condition. Longer search times in conditions with a combination of monoscopic and stereoscopic depth cues suggests that binding features into three-dimensional objects requires greater attentional effort. This additional effort should have implications for perceptual load theory, yet our findings did not uphold its predictions; the effect of incongruent distractors did not differ between conjunction search trials (conceptualised as high perceptual load) and feature search trials (low perceptual load). Individual differences in susceptibility to the effects of perceptual load were evident and likely explain the absence of load effects. Overall, our findings suggest that feature integration theory may be useful for predicting attentional performance in a 3D world.

In Search of Experience Effects: How TSA Officers Differ From Undergraduates on Visual Search Tasks

2012 ◽  
Author(s):  
Stephen R. Mitroff ◽  
Adam T. Biggs ◽  
Matthew S. Cain ◽  
Elise F. Darling ◽  
Kait Clark ◽  
...  
Keyword(s):  
Visual Search ◽  
Search Tasks ◽  
Experience Effects
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