THE INDONESIAN NEUROPSYCHOLOGICAL TEST BATTERY (INTB): PSYCHOMETRIC PROPERTIES, PRELIMINARY NORMATIVE SCORES, THE UNDERLYING COGNITIVE CONSTRUCTS, AND THE EFFECTS OF AGE AND EDUCATION

Indonesia lacks standardized and adapted neuropsychological tests, which hampers their use in clinical practice. Recently, an Indonesian Neuropsychological Consortium has initiated the adaptation of ten internationally commonly used tests for use in Indonesia. Here, we report the analyses of the psychometric properties, including preliminary normative data, the reliability, the underlying cognitive constructs, and the effects of age and education on these constructs as validity indicators.Four hundred ninety healthy adults living on Java Island participated in this study. All subjects completed the Indonesian Neuropsychological Test Battery (INTB) for diagnosis of various cognitive functions. The test-retest reliability was determined in a parallel study with fifty participants.Underlying cognitive constructs were assessed with Principal Component Analysis (PCA) revealed seven constructs that accounted for 62.84% of the total variance, and the goodness of fit of the model was good. ANOVAs showed significant effects of age on six constructs (i.e., speed of visuospatial information processing, auditory short-term and working memory, speed and inhibitory control, and verbal learning ability). Age effects were not found for executive internal language. All constructs showed effects of education, except for recall and verbal learning ability.Interestingly, as expected, not all constructs showed the same age-dependent decline, and if present, all seem to be unique. It is concluded that the psychometric properties of the INTB justify their usage for the Indonesian population.