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Age-Related Inter-Region EEG Coupling Changes During the Control of Bottom-Up and Top-Down Attention.

Li L, Zhao D - Front Aging Neurosci (2015)

Bottom Line: Specifically, prefronto-frontal coupling in theta- and alpha-bands, fronto-parietal and parieto-occipital couplings in beta-band for younger group showed a right hemispheric dominance, which was reduced with aging to compensate for the inhibitory dysfunction.While pop-out target detection was mainly associated with greater parieto-occipital beta-coupling strength compared to search condition regardless of aging.Taken together these findings provide evidence that prefronto-frontal coupling of theta-, alpha-, and beta-bands may serve as a possible basis of aging during visual attention, while parieto-occipital coupling in beta-band could serve for a bottom-up function and be vulnerable to top-down attention control for younger and older groups.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.

ABSTRACT
We investigated age-related changes in electroencephalographic (EEG) coupling of theta-, alpha-, and beta-frequency bands during bottom-up and top-down attention. Arrays were presented with either automatic "pop-out" (bottom-up) or effortful "search" (top-down) behavior to younger and older participants. The phase-locking value was used to estimate coupling strength between scalp recordings. Behavioral performance decreased with age, with a greater age-related decline in accuracy for the search than for the pop-out condition. Aging was associated with a declined coupling strength of theta and alpha frequency bands, with a greater age-related decline in whole-brain coupling values for the search than for the pop-out condition. Specifically, prefronto-frontal coupling in theta- and alpha-bands, fronto-parietal and parieto-occipital couplings in beta-band for younger group showed a right hemispheric dominance, which was reduced with aging to compensate for the inhibitory dysfunction. While pop-out target detection was mainly associated with greater parieto-occipital beta-coupling strength compared to search condition regardless of aging. Furthermore, prefronto-frontal coupling in theta-, alpha-, and beta-bands, and parieto-occipital coupling in beta-band functioned as predictors of behavior for both groups. Taken together these findings provide evidence that prefronto-frontal coupling of theta-, alpha-, and beta-bands may serve as a possible basis of aging during visual attention, while parieto-occipital coupling in beta-band could serve for a bottom-up function and be vulnerable to top-down attention control for younger and older groups.

No MeSH data available.


Related in: MedlinePlus

An example of the stimulus array in the two experimental conditions. Each trial includes a target. In the (up panel), the distractors differ from the target in both color and orientation, so that target detection is highly efficient and easy. In this pop-out condition, search is influenced primarily by the bottom–up attention. In the (down panel), the distractors differ from the target only in orientation, so that target detection is less efficient and difficult. In this search condition, target detection is controlled mainly by top–down attention.
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Figure 1: An example of the stimulus array in the two experimental conditions. Each trial includes a target. In the (up panel), the distractors differ from the target in both color and orientation, so that target detection is highly efficient and easy. In this pop-out condition, search is influenced primarily by the bottom–up attention. In the (down panel), the distractors differ from the target only in orientation, so that target detection is less efficient and difficult. In this search condition, target detection is controlled mainly by top–down attention.

Mentions: The stimuli were made up of 16 acute isosceles triangles, each with a particular color (red or green) and orientation [one of eight, (i-1) × 45°, i = 1, 2, 3, 4, 5, 6, 7, 8]. The triangles had two equal sides 6.5 cm in length and a third side 5.5 cm long, with an area of 16.20 cm × 16.20 cm. Figure 1 illustrates an example of the stimulus sequence. After a 500 ms fixation cross, a target triangle (one of 16 triangles) appeared in the center of the screen for 1000 ms and was followed by a short 500 ms delay screen with a fixation cross. After the delay, a four stimulus array was presented, consisting of the target and three distracter triangles in the four quadrants of the screen. The target was randomly presented in one of these locations (upper-left, lower-left, upper-right, and lower-right). The center of each triangle was 6.2 cm vertical (either up or down) from the horizontal midline and 8.2 cm lateral (either right or left) from the vertical midline, resulting in stimuli at a visual angle of 5.34° from fixation. The array remained on the screen until a response and was followed by a 1000 ms fixation to show the end of the trial. Three distractor triangles were chosen to create the two main attention conditions in the experiment: “pop-out” and “search.” The pop-out condition was created using distracters that differed from the target in both color and orientation (Treisman and Gelade, 1980), while the search condition was created by using distracters that differed from the target only in orientation. Half of the trials were in the pop-out condition and half were in the search condition. Half of the targets were presented in left visual field and half were in right visual field.


Age-Related Inter-Region EEG Coupling Changes During the Control of Bottom-Up and Top-Down Attention.

Li L, Zhao D - Front Aging Neurosci (2015)

An example of the stimulus array in the two experimental conditions. Each trial includes a target. In the (up panel), the distractors differ from the target in both color and orientation, so that target detection is highly efficient and easy. In this pop-out condition, search is influenced primarily by the bottom–up attention. In the (down panel), the distractors differ from the target only in orientation, so that target detection is less efficient and difficult. In this search condition, target detection is controlled mainly by top–down attention.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4664751&req=5

Figure 1: An example of the stimulus array in the two experimental conditions. Each trial includes a target. In the (up panel), the distractors differ from the target in both color and orientation, so that target detection is highly efficient and easy. In this pop-out condition, search is influenced primarily by the bottom–up attention. In the (down panel), the distractors differ from the target only in orientation, so that target detection is less efficient and difficult. In this search condition, target detection is controlled mainly by top–down attention.
Mentions: The stimuli were made up of 16 acute isosceles triangles, each with a particular color (red or green) and orientation [one of eight, (i-1) × 45°, i = 1, 2, 3, 4, 5, 6, 7, 8]. The triangles had two equal sides 6.5 cm in length and a third side 5.5 cm long, with an area of 16.20 cm × 16.20 cm. Figure 1 illustrates an example of the stimulus sequence. After a 500 ms fixation cross, a target triangle (one of 16 triangles) appeared in the center of the screen for 1000 ms and was followed by a short 500 ms delay screen with a fixation cross. After the delay, a four stimulus array was presented, consisting of the target and three distracter triangles in the four quadrants of the screen. The target was randomly presented in one of these locations (upper-left, lower-left, upper-right, and lower-right). The center of each triangle was 6.2 cm vertical (either up or down) from the horizontal midline and 8.2 cm lateral (either right or left) from the vertical midline, resulting in stimuli at a visual angle of 5.34° from fixation. The array remained on the screen until a response and was followed by a 1000 ms fixation to show the end of the trial. Three distractor triangles were chosen to create the two main attention conditions in the experiment: “pop-out” and “search.” The pop-out condition was created using distracters that differed from the target in both color and orientation (Treisman and Gelade, 1980), while the search condition was created by using distracters that differed from the target only in orientation. Half of the trials were in the pop-out condition and half were in the search condition. Half of the targets were presented in left visual field and half were in right visual field.

Bottom Line: Specifically, prefronto-frontal coupling in theta- and alpha-bands, fronto-parietal and parieto-occipital couplings in beta-band for younger group showed a right hemispheric dominance, which was reduced with aging to compensate for the inhibitory dysfunction.While pop-out target detection was mainly associated with greater parieto-occipital beta-coupling strength compared to search condition regardless of aging.Taken together these findings provide evidence that prefronto-frontal coupling of theta-, alpha-, and beta-bands may serve as a possible basis of aging during visual attention, while parieto-occipital coupling in beta-band could serve for a bottom-up function and be vulnerable to top-down attention control for younger and older groups.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.

ABSTRACT
We investigated age-related changes in electroencephalographic (EEG) coupling of theta-, alpha-, and beta-frequency bands during bottom-up and top-down attention. Arrays were presented with either automatic "pop-out" (bottom-up) or effortful "search" (top-down) behavior to younger and older participants. The phase-locking value was used to estimate coupling strength between scalp recordings. Behavioral performance decreased with age, with a greater age-related decline in accuracy for the search than for the pop-out condition. Aging was associated with a declined coupling strength of theta and alpha frequency bands, with a greater age-related decline in whole-brain coupling values for the search than for the pop-out condition. Specifically, prefronto-frontal coupling in theta- and alpha-bands, fronto-parietal and parieto-occipital couplings in beta-band for younger group showed a right hemispheric dominance, which was reduced with aging to compensate for the inhibitory dysfunction. While pop-out target detection was mainly associated with greater parieto-occipital beta-coupling strength compared to search condition regardless of aging. Furthermore, prefronto-frontal coupling in theta-, alpha-, and beta-bands, and parieto-occipital coupling in beta-band functioned as predictors of behavior for both groups. Taken together these findings provide evidence that prefronto-frontal coupling of theta-, alpha-, and beta-bands may serve as a possible basis of aging during visual attention, while parieto-occipital coupling in beta-band could serve for a bottom-up function and be vulnerable to top-down attention control for younger and older groups.

No MeSH data available.


Related in: MedlinePlus