isSignAndSymptomFor mild cognitive impairment due to Alzheimer's disease preservation of independence in functional abilities true https://pubmed.ncbi.nlm.nih.gov/21514249/ A symptom that entails mild problems performing complex functional tasks which they used to perform previously, such as paying bills, preparing a meal, or shopping. The person requires more time, is less efficient, and makes more errors at performing such activities than in the past. Nevertheless, the person generally maintains their independence of function in daily life. behavioral symptom