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Age mediation of frontoparietal activation during visual feature search.

Abstract：

:Activation of frontal and parietal brain regions is associated with attentional control during visual search. We used fMRI to characterize age-related differences in frontoparietal activation in a highly efficient feature search task, detection of a shape singleton. On half of the trials, a salient distractor (a color singleton) was present in the display. The hypothesis was that frontoparietal activation mediated the relation between age and attentional capture by the salient distractor. Participants were healthy, community-dwelling individuals, 21 younger adults (19-29 years of age) and 21 older adults (60-87 years of age). Top-down attention, in the form of target predictability, was associated with an improvement in search performance that was comparable for younger and older adults. The increase in search reaction time (RT) associated with the salient distractor (attentional capture), standardized to correct for generalized age-related slowing, was greater for older adults than for younger adults. On trials with a color singleton distractor, search RT increased as a function of increasing activation in frontal regions, for both age groups combined, suggesting increased task difficulty. Mediational analyses disconfirmed the hypothesized model, in which frontal activation mediated the age-related increase in attentional capture, but supported an alternative model in which age was a mediator of the relation between frontal activation and capture.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Madden DJ,Parks EL,Davis SW,Diaz MT,Potter GG,Chou YH,Chen NK,Cabeza R

doi

10.1016/j.neuroimage.2014.07.053

subject

Has Abstract

pub_date

2014-11-15 00:00:00

pages

262-74

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(14)00636-3

journal_volume

102 Pt 2

pub_type

杂志文章

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