Publicación Oficial de la Sociedad Ecuatoriana de Neurología, de la Liga Ecuatoriana Contra la Epilepsia y de la Sociedad Iberoamericana de Enfermedad Cerebrovascular

resonancia magnética funcional

 

Validación de un paradigma de razonamiento abstracto para Resonancia Magnética funcional (RMf). Validation of an abstract reasoning paradigm for functional magnetic resonance (fMR).

The paradigms are the experimental tasks that are used to map the brain through functional Magnetic Resonance Imaging. Its previous validation is essential to guarantee a successful record of the cognitive activity. A paradigm of abstract reasoning formed by a task of semantic and visual analogies was validated in young-adults between 18 and 30 years in the city of Cuenca-Ecuador. The paradigm was programmed in PsychoPy 3, a free software for neuroscience experiments. The results indicated that the experimental paradigm was understandable and easy to solve. It was also found that the average response time in the semantic reasoning task was significantly lower than the average resolution time of the visual reasoning task. Therefore, it was possible to establish the number of stimuli and their average exposure time needed for a functional Magnetic Resonance Imaging.

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Aspectos Neuropsicológicos de la Resonancia Magnética Funcional.

Cognitive neuropsychology and functional magnetic resonance (RMf) have marked a particularly fertile period in the development of neurosciences. Their clinical value, although incipient, is unquestionable. Integration of these two disciplines allows the registration  of cerebral images related to the neuronal activation of specific areas, providing structural and functional information of the human brain  under normal and pathological conditions. The RMf has important clinical and research applications. For example, pointing the brain  areas needed to be avoided during surgery, or observing the neurofunctional changes that take place with a  pharmacological treatment or neuropsychological rehabilitation. It also permits increasing the knowledge of  neurofunctional bases of different cerebral pathologies. It  is of special interest and importance the selection and implementation of the activation paradigm on functions to be studied, condition that  is required for the correct interpretation of the results. The procedure for RMf allows the study of a specific component in the  cognitive process in response to a specific task. It doesn’t identify the function as a unique feature, but it  identifies neurofunctional patterns. In this  article, the basic theoretical-methodological neuropsychological aspects are described for the implementation of studies by RMf.

 

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Tamaño de Muestra a Considerarse en un Estudio de Resonancia Magnética Funcional (RMF) con un Equipo de Resonancia Magnéticade 1.5 T.

This work presents an analysis of the necessary tools and special considerations to develop investigation in brain using fMRI with a magnetic resonator of 1.5 T field. This work presents the sample size and the necessary task time to use for showing results.

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