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Electrophysiological Correlates of Subitizing in Healthy Aging.

Pagano S, Fait E, Monti A, Brignani D, Mazza V - PLoS ONE (2015)

Bottom Line: ERP results in old participants showed a suppression of N2pc amplitudes for all numerosities, and a decrease in CDA only for the largest set (4-6 targets).In contrast with the pattern for young adults, time/frequency results on older adults revealed neither a modulation of alpha oscillations as a function of target numerosity, nor an effect of ERD lateralization.These patterns indicate that both attention and working memory contribute to the age-related decline in enumeration, and point to an overall decrease in the activity of the visual areas responsible for the processing of the hemifield where the relevant objects are presented.

View Article: PubMed Central - PubMed

Affiliation: Center for Mind/Brain Sciences (CIMeC), University of Trento, Trento, Italy.

ABSTRACT
To understand the nature of age-related changes in enumeration abilities we measured two ERP responses -N2pc and CDA, associated respectively to attentive individuation and VWM- and posterior alpha band (8-15 Hz) event-related desynchronization (ERD), traditionally linked to enhanced target processing. Two groups of old and young participants enumerated a variable number (1-6) of targets presented among distractors. Older participants were less accurate in enumerating targets. ERP results in old participants showed a suppression of N2pc amplitudes for all numerosities, and a decrease in CDA only for the largest set (4-6 targets). In contrast with the pattern for young adults, time/frequency results on older adults revealed neither a modulation of alpha oscillations as a function of target numerosity, nor an effect of ERD lateralization. These patterns indicate that both attention and working memory contribute to the age-related decline in enumeration, and point to an overall decrease in the activity of the visual areas responsible for the processing of the hemifield where the relevant objects are presented.

No MeSH data available.


Related in: MedlinePlus

Event related potential results.(A) ERP difference waveforms as a function of age group and numerosity. Panels represent respectively numerosities 1 to 6 for the old group group (left) and for the young group (right). (B) Mean amplitude values for the N2pc (200–300 ms) and CDA (400–600 ms) as a function of age group and numerosity.
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pone.0131063.g002: Event related potential results.(A) ERP difference waveforms as a function of age group and numerosity. Panels represent respectively numerosities 1 to 6 for the old group group (left) and for the young group (right). (B) Mean amplitude values for the N2pc (200–300 ms) and CDA (400–600 ms) as a function of age group and numerosity.

Mentions: Overall, the mean amplitude of N2pc was significantly suppressed in the old group with respect to the young group, as indicated by a significant main effect of group (F(1,34) = 4.1, p <.05). N2pc mean amplitude increased as a function of target numerosity in both young and old participants, leading to a significant main effect of numerosity (F(5, 170) = 11.78, p <.001). As for the behavioral data, we conducted post-hoc polynomial contrast tests. In line with previous studies [9,11,12] the contrast test showed a significant quadratic trend F(1,17) = 1.4, p <.01, suggesting that N2pc amplitude increased up to three elements (see Fig 2). The ANOVA on N2pc peak amplitude values indicated the same pattern of results (main effect of group: F(1,34) = 5,7 p <.05; main effect of numerosity: F(5,170) = 13.1, p <.01).


Electrophysiological Correlates of Subitizing in Healthy Aging.

Pagano S, Fait E, Monti A, Brignani D, Mazza V - PLoS ONE (2015)

Event related potential results.(A) ERP difference waveforms as a function of age group and numerosity. Panels represent respectively numerosities 1 to 6 for the old group group (left) and for the young group (right). (B) Mean amplitude values for the N2pc (200–300 ms) and CDA (400–600 ms) as a function of age group and numerosity.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4476746&req=5

pone.0131063.g002: Event related potential results.(A) ERP difference waveforms as a function of age group and numerosity. Panels represent respectively numerosities 1 to 6 for the old group group (left) and for the young group (right). (B) Mean amplitude values for the N2pc (200–300 ms) and CDA (400–600 ms) as a function of age group and numerosity.
Mentions: Overall, the mean amplitude of N2pc was significantly suppressed in the old group with respect to the young group, as indicated by a significant main effect of group (F(1,34) = 4.1, p <.05). N2pc mean amplitude increased as a function of target numerosity in both young and old participants, leading to a significant main effect of numerosity (F(5, 170) = 11.78, p <.001). As for the behavioral data, we conducted post-hoc polynomial contrast tests. In line with previous studies [9,11,12] the contrast test showed a significant quadratic trend F(1,17) = 1.4, p <.01, suggesting that N2pc amplitude increased up to three elements (see Fig 2). The ANOVA on N2pc peak amplitude values indicated the same pattern of results (main effect of group: F(1,34) = 5,7 p <.05; main effect of numerosity: F(5,170) = 13.1, p <.01).

Bottom Line: ERP results in old participants showed a suppression of N2pc amplitudes for all numerosities, and a decrease in CDA only for the largest set (4-6 targets).In contrast with the pattern for young adults, time/frequency results on older adults revealed neither a modulation of alpha oscillations as a function of target numerosity, nor an effect of ERD lateralization.These patterns indicate that both attention and working memory contribute to the age-related decline in enumeration, and point to an overall decrease in the activity of the visual areas responsible for the processing of the hemifield where the relevant objects are presented.

View Article: PubMed Central - PubMed

Affiliation: Center for Mind/Brain Sciences (CIMeC), University of Trento, Trento, Italy.

ABSTRACT
To understand the nature of age-related changes in enumeration abilities we measured two ERP responses -N2pc and CDA, associated respectively to attentive individuation and VWM- and posterior alpha band (8-15 Hz) event-related desynchronization (ERD), traditionally linked to enhanced target processing. Two groups of old and young participants enumerated a variable number (1-6) of targets presented among distractors. Older participants were less accurate in enumerating targets. ERP results in old participants showed a suppression of N2pc amplitudes for all numerosities, and a decrease in CDA only for the largest set (4-6 targets). In contrast with the pattern for young adults, time/frequency results on older adults revealed neither a modulation of alpha oscillations as a function of target numerosity, nor an effect of ERD lateralization. These patterns indicate that both attention and working memory contribute to the age-related decline in enumeration, and point to an overall decrease in the activity of the visual areas responsible for the processing of the hemifield where the relevant objects are presented.

No MeSH data available.


Related in: MedlinePlus