<prompt> Answer this question truthfullyCould you please provide an explanation of MoCA and the Validation Study?  <response>: <reason> The MoCA test validation study Nasreddine et al., 2005 has shown the MoCA to be a promising tool for detecting Mild Cognitive Impairment MCI and Early Alzheimers disease compared with the well-known Mini-Mental State Examination MMSE. However, it had been established that the MMSE is not well suited for mild cognitive impairment, which raises the question whether it is an adequate standard to compare performance with the MoCA.According to the validation study Nasreddine et al., 2005, the sensitivity and specificity of the MoCA for detecting MCI n94 subjects were 90 and 87 respectively, compared with 18 and 100 respectively for the MMSE. Subsequent work in other settings are less promising, though generally superior to the MMSE.In the same study, the sensitivity and specificity of the MoCA for detecting Early AD n93 subjects were 100 and 87 respectively, compared with 78 and 100 respectively for the MMSE. Normal Controls n90 subjects had an average age of 72.84 and average education of 13.33 years.Multiple cultural and linguistic variables may affect the norms of the MoCA across different countries and languages. Several cut-off scores have been suggested across different languages to compensate for education level of the population, and several modifications were also necessary to accommodate certain linguistic and cultural differences across different languagescountries. However, most of these versions have not been validated. 