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Visual Features: Featural Strength and Visual Strength Are Two Dissociable Dimensions.

Huang L - Sci Rep (2015)

Bottom Line: The results confirmed that featural strength has substantial effects on high-level tasks but only a negligible effect on the low-level task.The results also revealed a complementary interaction: Visual strength has a substantial effect on the low-level task, but a negligible effect on high-level tasks.The present results, along with other findings, challenge the generality of processing visual features.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, The Chinese University of Hong Kong, Hong Kong, China.

ABSTRACT
Visual features are often assumed to be the general building blocks for various visual tasks. However, it is well known that some stimulus categories (i.e., basic features) can be processed in parallel, but others (e.g., Ts in different orientations) need to be scanned serially, and this difference in featural strength seems to be on a fundamentally different dimension from differences in visual strength (e.g., reduction in contrast). This study compared two high-level tasks, namely tasks that require a lot of attentional operations (change detection and pattern comparison), with one low-level task, namely a task that requires few attentional operations (perceptual discrimination). The results confirmed that featural strength has substantial effects on high-level tasks but only a negligible effect on the low-level task. The results also revealed a complementary interaction: Visual strength has a substantial effect on the low-level task, but a negligible effect on high-level tasks. Overall, featural strength and visual strength are two dissociable dimensions in processing of visual features. The present results, along with other findings, challenge the generality of processing visual features.

No MeSH data available.


Sequence of presentations in the three tasks.In the perceptual discrimination task, the participants were asked to report whether a cue and a target were the same or not. In the pattern comparison task, the participants were asked to report whether the left and right sides of the stimuli display were the same or not. In the change detection task, the participants were asked to report whether the stimuli and the probe displays were the same or not.
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f3: Sequence of presentations in the three tasks.In the perceptual discrimination task, the participants were asked to report whether a cue and a target were the same or not. In the pattern comparison task, the participants were asked to report whether the left and right sides of the stimuli display were the same or not. In the change detection task, the participants were asked to report whether the stimuli and the probe displays were the same or not.

Mentions: As shown in Fig. 3, in the pattern comparison and change detection tasks, the stimulus items were presented in eight locations arranged as two 2 × 2 arrays on the left and right sides of the display and the centers of the arrays were 2.91 cm away from the center of the display. In each array, the distance between items, both horizontally and vertically, was 1.46 cm. In the perceptual discrimination task, the single item was randomly presented in one of the eight locations of the two arrays.


Visual Features: Featural Strength and Visual Strength Are Two Dissociable Dimensions.

Huang L - Sci Rep (2015)

Sequence of presentations in the three tasks.In the perceptual discrimination task, the participants were asked to report whether a cue and a target were the same or not. In the pattern comparison task, the participants were asked to report whether the left and right sides of the stimuli display were the same or not. In the change detection task, the participants were asked to report whether the stimuli and the probe displays were the same or not.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4562251&req=5

f3: Sequence of presentations in the three tasks.In the perceptual discrimination task, the participants were asked to report whether a cue and a target were the same or not. In the pattern comparison task, the participants were asked to report whether the left and right sides of the stimuli display were the same or not. In the change detection task, the participants were asked to report whether the stimuli and the probe displays were the same or not.
Mentions: As shown in Fig. 3, in the pattern comparison and change detection tasks, the stimulus items were presented in eight locations arranged as two 2 × 2 arrays on the left and right sides of the display and the centers of the arrays were 2.91 cm away from the center of the display. In each array, the distance between items, both horizontally and vertically, was 1.46 cm. In the perceptual discrimination task, the single item was randomly presented in one of the eight locations of the two arrays.

Bottom Line: The results confirmed that featural strength has substantial effects on high-level tasks but only a negligible effect on the low-level task.The results also revealed a complementary interaction: Visual strength has a substantial effect on the low-level task, but a negligible effect on high-level tasks.The present results, along with other findings, challenge the generality of processing visual features.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, The Chinese University of Hong Kong, Hong Kong, China.

ABSTRACT
Visual features are often assumed to be the general building blocks for various visual tasks. However, it is well known that some stimulus categories (i.e., basic features) can be processed in parallel, but others (e.g., Ts in different orientations) need to be scanned serially, and this difference in featural strength seems to be on a fundamentally different dimension from differences in visual strength (e.g., reduction in contrast). This study compared two high-level tasks, namely tasks that require a lot of attentional operations (change detection and pattern comparison), with one low-level task, namely a task that requires few attentional operations (perceptual discrimination). The results confirmed that featural strength has substantial effects on high-level tasks but only a negligible effect on the low-level task. The results also revealed a complementary interaction: Visual strength has a substantial effect on the low-level task, but a negligible effect on high-level tasks. Overall, featural strength and visual strength are two dissociable dimensions in processing of visual features. The present results, along with other findings, challenge the generality of processing visual features.

No MeSH data available.