Neuropsychological testing and questionnaires The Vienna Neuropsychological Test Battery (VNTB)as well as the Consortium to Establish a Registry for Alzheimer's Disease (CERAD) were selected in order to assess cognitive functions, such as visuo-construction, concentration/attention, language, memory and executive functioning domains. These cognitive abilities are known to be commonly affected by Alzheimer's disease and other dementias. The two batteries of tests have been found to be sensitive in the evaluation of mild cognitive impairment.