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            <title xml:lang="en">Reduced spatial attentional distribution in older adults</title>
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            <idno type="halRefHtml">&lt;i&gt;Journal of Vision&lt;/i&gt;, 2024, 24 (4), pp.8. &lt;a target="_blank" href="https://dx.doi.org/10.1167/jov.24.4.8"&gt;&amp;#x27E8;10.1167/jov.24.4.8&amp;#x27E9;&lt;/a&gt;</idno>
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                <title xml:lang="en">Reduced spatial attentional distribution in older adults</title>
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              <p>Older adults show decline in visual search performance, but the underlying cause remains unclear. It has been suggested that older adults' altered performance may be related to reduced spatial attention to peripheral visual information compared with younger adults. In this study, 18 younger (M = 21.6 years) and 16 older (M = 69.1 years) participants performed pop-out and serial visual search tasks with variously sized gaze-contingent artificial central scotomas (3°, 5°, or 7° diameter). By occluding central vision, we measured how attention to the periphery was contributing to the search performance. We also tested the effect of target eccentricity on search times and eye movements. We hypothesized that, if attention is reduced primarily in the periphery in older adults, we would observe longer search times for more eccentric targets and with central occlusion. During the pop-out search, older adults showed a steeper decline in search performance with increasing eccentricity and central scotoma size compared with younger adults. In contrast, during the serial search, older adults had longer search times than younger adults overall, independent of target eccentricity and scotoma size. Longer search times were attributed to higher cost-per-item slopes, indicating increased difficulty in simultaneously processing complex symbols made up of separable features in aging, possibly stemming from challenges in spatially binding individual features. Altogether, our findings point to fewer attentional resources of simultaneous visual processing to distribute over space or separable features of objects, consistent with decreased dorsal visual stream functioning in aging.</p>
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