In terms of inter- and intra-hemispheric reorganization HR , the semantic hypothesis predicts increased temporo-parietal and decreased frontal activity. This result suggests that older adults increase the recruitment of executive functioning to maintain lexical production, as during naming. Our main goal was to determine HR mechanisms that may account for this dissociation, with two objectives. They gave their written informed consent for the study, which was approved by the local ethics committee CPP no. The use, distribution or reproduction in other forums is permitted, provided the original author s or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice.
To maintain accuracy, older adults recruit compensatory mechanisms and strategies. In line with the semantic hypothesis, using functional magnetic resonance imaging fMRI , Baciu et al. In this study, we evaluated the influence of age on naming latencies i. The second finding consisted of bilateral recruitment of frontal regions to maintain appropriate response times, especially in older adults who were faster performers. Our main goal was to determine HR mechanisms that may account for this dissociation, with two objectives. They gave their written informed consent for the study, which was approved by the local ethics committee CPP no. In addition, Lacombe et al. These modifications are reflected in multiple patterns of inter- and intra-hemispheric cerebral reorganization e. This reduced inter-hemispheric frontal asymmetry in aging was interpreted as a difficulty in retrieving words, resulting from a decline in executive function Wierenga et al. Other authors have shown that the left antero-posterior axis was related to task demands Wierenga et al. Whereas some older adults show decreased performance, others tend to show similar performance, as compared to younger adults. According to HAROLD, the supplementary involvement of right prefrontal regions reflects engagement of compensatory executive mechanisms to maintain performance. Thus, the aforementioned HAROLD pattern may be related to higher cognitive reserve, suggesting that differential frontal recruitment, related to executive functioning, can be expected in older adults. For instance, object naming is preserved longer in aging, compared to naming famous people Cohen and Faulkner, ; Evrard, ; James, The use, distribution or reproduction in other forums is permitted, provided the original author s or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. The effect of cognitive reserve on naming latencies in older adults was explored by dividing the older group into two groups, slower longer latencies or response times or faster shorter latencies adults. This suggests that the anatomical basis of naming processes with aging is organized along fronto-temporo-parietal or antero-posterior axes. At the cerebral level, aging modulates cerebral activity Greenwood, , reflected either by increased or decreased activity, or by additional recruitment of regions that are not usually engaged by similar tasks in younger adults e. Other PASA variants reported decreased activity in regions other than the occipital lobe, such as medial temporal areas Gutchess et al. We suggest that aging is associated with multiple, co-existing compensation and reorganization mechanisms and patterns associated with lexical production. In terms of inter- and intra-hemispheric reorganization HR , the semantic hypothesis predicts increased temporo-parietal and decreased frontal activity. Therefore, the relative preservation of object naming in older adults might be explained by a supplementary contribution of semantic processes that facilitate lexico-semantic retrieval during naming Boudiaf et al. This article has been cited by other articles in PMC. We report two main results. However, despite these frequent subjective complaints, the objective evidence for lexical production and naming deficits in aging varies according to the task and material Ska and Goulet, ; Goulet et al. For naming latencies, Obler et al.
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