As evidence of cognitive decline, the criteria suggest that the person or an<br>informant report a decline and that there is impairment on objective cognitive<br>tasks or that decline over time is observable on cognitive tasks. Reports by<br>informants usually are more helpful than those by patients (Ringman et al.,<br>2009). In addition, the basic activities of daily living must be preserved with<br>minimal impairment of complex activities.
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