The purpose of the current study was to investigate the effects of syntactic complexity on the accuracy and response time (RT) of a case marker processing (CMP) task in normal elderly adults (A), persons with mild cognitive impairment (MCI). The CMP...

The purpose of the current study was to investigate the effects of syntactic complexity on the accuracy and response time (RT) of a case marker processing (CMP) task in normal elderly adults (A), persons with mild cognitive impairment (MCI). The CMP task consisted of eight different syntactic structures: (1)transitive verbs with two-place arguments (2)transitive verbs with three-place arguments (3)passive (4)coordinate conjunction (CC) (5)Subject-Subject relative clause (SS) (6)Subject-Object relative clause (SO) (7)Object-Object relative clause (OO) (8)Object-Subject relative clause (SO). There were eight trials for each syntactic structure, and each item was randomly presented on a touch-screen computer monitor.
Sixteen individuals with MCI, 21 with age and education year-matched As participated in the study. Performance on the CMP task was analyzed using two-way mixed ANOVA for the accuracy and using Mann-Whitney test and Wilcoxon signed ranks test for the RT.
Results were summarized as follows: (1)there were significant differences between the two groups, showing that the A group had higher accuracy than MCI group, (2)sentences with one proposition yielded higher accuracy than sentences with two propositions, (3)RTs from each syntactic structure were not significantly different between the groups.
The results from the current study suggested that the syntactic-complexity based CMP task could be a sensitive tool to differentiate MCI group from normal aging population.

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