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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.


Results of Experiment 1–3.Panel (a) shows the results of Experiment 1–3. Panel (b) shows the effects of manipulations (i.e., visual strength effect vs. featural strength effect) and error bars show 95% confidence intervals. Visual strength had a substantial effect on the low-level task (perceptual discrimination) but only negligible effects on the high-level tasks (pattern comparison and change detection), whereas featural strength showed the opposite pattern: substantial effects on the high-level tasks, but only a negligible effect on the low-level task.
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f4: Results of Experiment 1–3.Panel (a) shows the results of Experiment 1–3. Panel (b) shows the effects of manipulations (i.e., visual strength effect vs. featural strength effect) and error bars show 95% confidence intervals. Visual strength had a substantial effect on the low-level task (perceptual discrimination) but only negligible effects on the high-level tasks (pattern comparison and change detection), whereas featural strength showed the opposite pattern: substantial effects on the high-level tasks, but only a negligible effect on the low-level task.

Mentions: The results of Experiment 1–3 are plotted in Fig. 4a, and the effects of visual strength and featural strength (i.e., the differences between baseline and each of the other two conditions) are plotted in Fig. 4b. In the low-level task (perceptual discrimination), visual strength had a substantial effect, but featural strength had a slightly negative effect. The effects of featural and visual strengths were significantly different from each other (t (31) = 19.42; p < 0.0001; Cohen’s d = 3.43; BF10 = 6.89e + 15).


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

Huang L - Sci Rep (2015)

Results of Experiment 1–3.Panel (a) shows the results of Experiment 1–3. Panel (b) shows the effects of manipulations (i.e., visual strength effect vs. featural strength effect) and error bars show 95% confidence intervals. Visual strength had a substantial effect on the low-level task (perceptual discrimination) but only negligible effects on the high-level tasks (pattern comparison and change detection), whereas featural strength showed the opposite pattern: substantial effects on the high-level tasks, but only a negligible effect on the low-level task.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: Results of Experiment 1–3.Panel (a) shows the results of Experiment 1–3. Panel (b) shows the effects of manipulations (i.e., visual strength effect vs. featural strength effect) and error bars show 95% confidence intervals. Visual strength had a substantial effect on the low-level task (perceptual discrimination) but only negligible effects on the high-level tasks (pattern comparison and change detection), whereas featural strength showed the opposite pattern: substantial effects on the high-level tasks, but only a negligible effect on the low-level task.
Mentions: The results of Experiment 1–3 are plotted in Fig. 4a, and the effects of visual strength and featural strength (i.e., the differences between baseline and each of the other two conditions) are plotted in Fig. 4b. In the low-level task (perceptual discrimination), visual strength had a substantial effect, but featural strength had a slightly negative effect. The effects of featural and visual strengths were significantly different from each other (t (31) = 19.42; p < 0.0001; Cohen’s d = 3.43; BF10 = 6.89e + 15).

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.