Acceso usuarios
Laura María Victoria Manoiloff, Leticia Vivas, Silvia Constanza Andreini, Nicolás Linares, Mercedes Soledad Fuentes Leiza, Laura Del Boca, Juan Segui
En el presente trabajo se detallan los análisis realizados con el fin de estudiar las propiedades psicométricas la Prueba Argentina Psicolingüística de Denominación de Imágenes (PAPDI). La misma cuenta con dos cualidades que representan un valor agregado frente a las pruebas actualmente disponibles en nuestro país: a) los estímulos fueron seleccionados controlando las variables que afectan las etapas de análisis visual y de representación conceptual de la imagen del objeto y se manipularon las variables que afectan la selección y recuperación de la etiqueta léxica, en base a valores normativos de población argentina; y b) las claves semánticas se elaboraron de acuerdo con normas de producción de atributos semánticos también recolectadas en nuestro país. En este trabajo se analizaron las propiedades psicométricas mediante el estudio de pacientes con demencia tipo Alzheimer, con lesiones cerebrales focales y participantes sin patología neurológica. Se buscaron evidencias de validez de criterio mediante el análisis de grupos contrastados y la correlación con el test de Boston. A su vez, se estudió la confiabilidad de las puntuaciones por dos métodos: consistencia interna y test-retest. También se analizó la capacidad de discriminación entre pacientes con y sin anomia mediante curvas ROC. Se estudiaron además los efectos de las variables manipuladas, se realizó un análisis cualitativo de los errores y se examinó el desempeño en función del uso de las claves. Los resultados de los análisis aportan evidencia de que presenta cualidades psicométricas sumamente aceptables para su uso en nuestra población.
In the current paper we present the psychometric analysis of the Argentinean Psycholinguistic Image Naming Test (PAPDI). This test has two characteristics that makes it different from those currently available in our country: a) the stimuli has been chosen and ordered controlling certain psycholinguistic variables proven to have influence on this task, such as Visual Complexity, Image Agreement, Image Variability, Familiarity, Name Agreement, Age of Acquisition and Frequency of Use, following Argentinean normative data base; and b) semantic cues were elaborated according to semantic feature production norms also from Argentina. We present here the psychometric analysis of its properties. There were analyzed through the study of patients with Alzheimer Disease (n = 25) and focal brain lesions (n = 27) and healthy participants (n = 125). On the first place, in order to study criteria validity a group comparison analysis was carried out. On the one hand Alzheimer Disease patients were compared with healthy participants. On the other hand, two focal brain damaged patients were compared: with and without aphasia. Convergent validity was also studied through the correlation with Boston naming test. In the third place, scores reliability was studied through two methods: internal consistency analysis, for Alzheimer, focal and healthy groups, and test-retest for focal brain damage group. Forth, it was analyzed the capacity to discriminate between patient with and without aphasia through ROC curves analysis. The respective sensitivity and specificity values to detect anomia were established. Fifth, the demographic variables´ influence was analyzed through a regression analysis. Moreover, there were analyzed the effects of two psycholinguistic variables that were taken into account to order the images but were not normalized: Lexical Frequency and Age of Acquisition. Finally, type of errors and response to cues were studied for focal brain damaged patients. The results indicated that the PAPDI presents acceptable psychometric properties to be used as a tool in neuropsychological assessment. It showed evidence of internal and external validity and it was observed scores reliability through internal consistency and test-retest. A suggested cutting point was established to detect anomia. Furthermore a main influence of educational level was reported. There were also detected effects of Lexical Frequency and Age of Acquisition which were observed for Alzheimer and aphasic patients groups. Moreover it was illustrated the response profile analysis for aphasic and non aphasic focal brain damaged patients regarding a proposed taxonomy of error types. It was also studied the response to semantic and phonological cues and it was observed that both contributed to improve patients´ performance.
