Production and Comprehension of Past and Future Reference in Agrammatic Aphasia: A Systematic Review and Meta-analysis
Le résumé fourni par la source
Individuals with Agrammatic Aphasia (IWAA) have been consistently found to face problems with time reference, and several studies have provided evidence for a selective impairment in past reference. A prominent account of this selective deficit is the PAst-DIscourse LInking Hypothesis (PADILIH; Bastiaanse et al., 2011). However, recent studies have found no dissociation between past and future reference in IWAA. The present systematic review and individual participant data (IPD) meta-analysis addresses whether past and future reference are differentially affected in IWAA, and whether performance patterns are moderated by language modality, task type, target verb forms’ morphological/morphosyntactic complexity and demographic factors. Twenty-one published studies were included in the meta-analysis (reporting 225 observations from 161 participants). In the full dataset (i.e. with the production and comprehension trials merged), there was a small future reference advantage, but after adjusting for small-study effects there was no reliable performance difference between past and future reference. However, a language modality effect emerged, as a future reference advantage was observed in production but not in comprehension. Nevertheless, the future reference advantage in production was task dependent, as it was evident only in picture-assisted sentence completion tasks. Furthermore, morphological complexity moderated the performance differences between past and future reference in production but not in comprehension. Finally, there was a small positive association between the future advantage and age in production but not in comprehension, and no evidence that participant sex and education moderated IWAA’s performance pattern on past and future reference in either modality.
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