<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-8748</journal-id>
<journal-title><![CDATA[Acta Neurológica Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Neurol Colomb.]]></abbrev-journal-title>
<issn>0120-8748</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Neurología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-87482015000100014</article-id>
<article-id pub-id-type="doi">10.22379/2422402214</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Neuropsicología y la localización de las funciones cerebrales superiores en estudios de resonancia magnética funcional con tareas]]></article-title>
<article-title xml:lang="en"><![CDATA[Neuropsychology and the localization of superior brain functions in fMRI with task studies]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrales Paffen]]></surname>
<given-names><![CDATA[Amelia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro Médico de la Clínica de Occidente  ]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2015</year>
</pub-date>
<volume>31</volume>
<numero>1</numero>
<fpage>92</fpage>
<lpage>100</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-87482015000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-87482015000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-87482015000100014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El objetivo es destacar la capacidad de la resonancia magnética funcional con tareas para evaluar diversas funciones cerebrales superiores, mediante la ejecución de paradigmas que producen activación cerebral de las regiones involucradas. Resaltar la importancia del neuropsicólogo en la creación de paradigmas y en la interpretación de los resultados. Se realizó una revisión no sistemática de la literatura científica recogida en las bases de datos de: Rev Neurol, Neurology, Radiología, Neuroimage, J Neuroimaging, Science, Brain, Neuroscience and biobehavioral reviews, journal of neuroscience, Eur J Radiol, Magnetic resonance in medicine, Neurosurgery, Neuroimagingclin, Neuropsidologia latinoamericana, International journal of neuroscience, Science, Biol Psychiatry, Psychol Med, Arch Gen Psychiatry, Psychiatry Res Neuroimaging, Neuro Report, Neuron, J ClinExpNeuropsychol, Proc Natl Acad Sci U S A, Ann Neurol Neurobiol Aging, Neurosci Lett, Journal of Neuroscience. Los descriptores utilizados fueron "Resonancia magnética funcional", "Paradigmas" y "Neuropsicología". Se seleccionaron los artículos científicos de cualquier tipo y en español e inglés; desde el inicio de la indización de la fuente primaria hasta noviembre de 2014. Se recuperaron 42 artículos. Se analizaron todos los conceptos sobre resonancia magnética funcional, neuropsicología, funciones cerebrales superiores, áreas cerebrales activadas, paradigmas. Los mapas de activación neuronal confirman la participación simultánea de diferentes áreas cerebrales, incluso distantes, durante la ejecución de paradigmas. La participación del neuropsicólogo dentro del grupo multidisciplinario es muy importante por su conocimiento profundo de los factores involucrados en el desempeño de las diferentes tareas cognitivas potencialmente evaluables por resonancia magnética funcional.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[To highlight the capacity of functional magnetic resonance imaging (fMRI) with tasks in order to measure different higher brain functions by running paradigms that produce brain activation in the regions involved. Highlighting the importance of the neuropsychologist in creating paradigms and interpreting results. A non-systematic review of the scientific literature contained in the databases was conducted: Rev Neurol, Neurology, Radiología, Neuroimage, J Neuroimaging, Science, Brain, Neuroscience and biobehavioral reviews, journal of neuroscience, Eur J Radiol, Magnetic Resonance in Medicine, Neurosurgery, Neuroimagingclin, Neuropsicologia Latinoamericana, International Journal of Neuroscience, Biol Psychiatry, Psychol Med, Arch Gen Psychiatry, Psychiatry Res Neuroimaging, Neuro Report, Neuron, J ClinExpNeuropsychol , Proc Natl Acad Sci U S A, Ann Neurol Neurobiol Aging, Neurosci Lett, Journal of Neuroscience. The descriptors used were: "functional MRI", "Paradigms" and "Neuropsychology". Papers in Spanish and English of any kind were selected since the start of indexing the primary source until November 2014. 42 articles were retrieved. The following concepts were analyzed: functional magnetic resonance imaging, neuropsychology, higher brain functions, activated brain areas paradigms. The neural activation maps confirm the simultaneous involvement of different brain areas, even distant ones, during the execution of paradigms. Neuropsychologist participation within the multidisciplinary team is very important for its deep understanding of the factors involved in the performance of different cognitive tasks potentially assessable by fMRI.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Neuropsicólogo]]></kwd>
<kwd lng="es"><![CDATA[Paradigma]]></kwd>
<kwd lng="es"><![CDATA[Áreas cerebrales]]></kwd>
<kwd lng="es"><![CDATA[Funciones cerebrales superiores]]></kwd>
<kwd lng="es"><![CDATA[Resonancia magnética funcional]]></kwd>
<kwd lng="en"><![CDATA[Neuropsychologist]]></kwd>
<kwd lng="en"><![CDATA[Paradigm]]></kwd>
<kwd lng="en"><![CDATA[Brain areas]]></kwd>
<kwd lng="en"><![CDATA[Higher brain functions]]></kwd>
<kwd lng="en"><![CDATA[Functional magnetic resonance imaging]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">       <p><b>Revisi&oacute;n</b></p>      <p align="center"><font size="4"><b>Neuropsicolog&iacute;a y la localizaci&oacute;n de las funciones cerebrales superiores en estudios de resonancia magn&eacute;tica funcional con tareas</b></font></p>     <p align="center"><font size="3"><b>Neuropsychology and the localization of superior brain functions in fMRI with task studies</b></font></p>      <p align="center">Amelia Cabrales Paffen (1)</p>      <p>(1) Ms. Neuropsicolog&iacute;a. Centro M&eacute;dico de la Cl&iacute;nica de Occidente. Cali, Colombia.</p>      <p>Recibido: 30/03/14. Aceptado: 6/01/15.     <br> Correspondencia: Amelia Cabrales: <a href="mailto:ameliacabrales@gmail.com">ameliacabrales@gmail.com</a></p>  <hr>     <p><font size="3"><B>Resumen</b></font></p>      <p>El objetivo es destacar la capacidad de la resonancia magn&eacute;tica funcional con tareas para evaluar diversas funciones cerebrales superiores, mediante la ejecuci&oacute;n de paradigmas que producen activaci&oacute;n cerebral de las regiones involucradas. Resaltar la importancia del neuropsic&oacute;logo en la creaci&oacute;n de paradigmas y en la interpretaci&oacute;n de los resultados.</p>      ]]></body>
<body><![CDATA[<p>Se realiz&oacute; una revisi&oacute;n no sistem&aacute;tica de la literatura cient&iacute;fica recogida en las bases de datos de: Rev Neurol, Neurology, Radiolog&iacute;a, Neuroimage, J Neuroimaging, Science, Brain, Neuroscience and biobehavioral reviews, journal of neuroscience, Eur J Radiol, Magnetic resonance in medicine, Neurosurgery, Neuroimagingclin, Neuropsidologia latinoamericana, International journal of neuroscience, Science, Biol Psychiatry, Psychol Med, Arch Gen Psychiatry, Psychiatry Res Neuroimaging, Neuro Report, Neuron, J ClinExpNeuropsychol, Proc Natl Acad Sci U S A, Ann Neurol Neurobiol Aging, Neurosci Lett, Journal of Neuroscience. Los descriptores utilizados fueron &ldquo;Resonancia magn&eacute;tica funcional&rdquo;, &ldquo;Paradigmas&rdquo; y &ldquo;Neuropsicolog&iacute;a&rdquo;. Se seleccionaron los art&iacute;culos cient&iacute;ficos de cualquier tipo y en espa&ntilde;ol e ingl&eacute;s; desde el inicio de la indizaci&oacute;n de la fuente primaria hasta noviembre de 2014.</p>      <p>Se recuperaron 42 art&iacute;culos. Se analizaron todos los conceptos sobre resonancia magn&eacute;tica funcional, neuropsicolog&iacute;a, funciones cerebrales superiores, &aacute;reas cerebrales activadas, paradigmas.</p>      <p>Los mapas de activaci&oacute;n neuronal confirman la participaci&oacute;n simult&aacute;nea de diferentes &aacute;reas cerebrales, incluso distantes, durante la ejecuci&oacute;n de paradigmas. La participaci&oacute;n del neuropsic&oacute;logo dentro del grupo multidisciplinario es muy importante por su conocimiento profundo de los factores involucrados en el desempe&ntilde;o de las diferentes tareas cognitivas potencialmente evaluables por resonancia magn&eacute;tica funcional.</p>      <p><b>Palabra clave:</b> Neuropsic&oacute;logo, Paradigma, &Aacute;reas cerebrales, Funciones cerebrales superiores, Resonancia magn&eacute;tica funcional (DeCS).</p>  <hr>     <p><font size="3"><B>Summary</b></font></p>      <p>To highlight the capacity of functional magnetic resonance imaging (fMRI) with tasks in order to measure different higher brain functions by running paradigms that produce brain activation in the regions involved. Highlighting the importance of the neuropsychologist in creating paradigms and interpreting results.</p>      <p>A non-systematic review of the scientific literature contained in the databases was conducted: Rev Neurol, Neurology, Radiolog&iacute;a, Neuroimage, J Neuroimaging, Science, Brain, Neuroscience and biobehavioral reviews, journal of neuroscience, Eur J Radiol, Magnetic Resonance in Medicine, Neurosurgery, Neuroimagingclin, Neuropsicologia Latinoamericana, International Journal of Neuroscience, Biol Psychiatry, Psychol Med, Arch Gen Psychiatry, Psychiatry Res Neuroimaging, Neuro Report, Neuron, J ClinExpNeuropsychol , Proc Natl Acad Sci U S A, Ann Neurol Neurobiol Aging, Neurosci Lett, Journal of Neuroscience. The descriptors used were: &ldquo;functional MRI&rdquo;, &ldquo;Paradigms&rdquo; and &ldquo;Neuropsychology&rdquo;. Papers in Spanish and English of any kind were selected since the start of indexing the primary source until November 2014. 42 articles were retrieved. The following concepts were analyzed: functional magnetic resonance imaging, neuropsychology, higher brain functions, activated brain areas paradigms. The neural activation maps confirm the simultaneous involvement of different brain areas, even distant ones, during the execution of paradigms. Neuropsychologist participation within the multidisciplinary team is very important for its deep understanding of the factors involved in the performance of different cognitive tasks potentially assessable by fMRI.</p>      <p><b>Key words.</b> Neuropsychologist, Paradigm, Brain areas, Higher brain functions, Functional magnetic resonance imaging (fMRI) (MeSH).</p>  <hr>     <p>El inter&eacute;s por entender el cerebro, su funcionamiento y bases estructurales no es apenas actual; en el intento de dar una explicaci&oacute;n a este inter&eacute;s han surgido en la historia diversas teor&iacute;as. Una de esas teor&iacute;as fue el localizacionismo puro o la teor&iacute;a de &ldquo;mapas frenol&oacute;gicos&rdquo;, propuesta a principios del siglo XIX por, entre otros, Franz Joseph Gall y Karl Kleist. Esta teor&iacute;a planteaba que las funciones cerebrales superiores se pod&iacute;an localizar en &aacute;reas espec&iacute;ficas del cerebro. Paul Brocca determin&oacute; que cuando se produce una alteraci&oacute;n importante en la articulaci&oacute;n del lenguaje, la causa es una lesi&oacute;n en el tercio posterior del giro frontal inferior del cerebro, y postul&oacute; &ldquo;el centro de las im&aacute;genes motoras de las palabras&rdquo;. Por su parte, el psiquiatra Alem&aacute;n Carl Wernicke, asoci&oacute; el tercio posterior del giro temporal superior izquierdo con la comprensi&oacute;n del lenguaje oral, proponiendo &ldquo;el centro de las im&aacute;genes sensoriales de las palabras&rdquo; (1).</p>      <p>A pesar de las bases cl&iacute;nicas, Constantin von Monakow y Kurt Goldstein pusieron en duda la veracidad de los mapas frenol&oacute;gicos sin negar que la audici&oacute;n, la visi&oacute;n, el movimiento y la sensaci&oacute;n cut&aacute;nea est&aacute;n representadas en &aacute;reas espec&iacute;ficas de la corteza; surge entonces la teor&iacute;a de la equipotencialidad o integralidad o voces no&eacute;ticas de los procesos mentales, que establece que todo tejido neural participaba de manera conjunta ante una tarea cognitiva. Esta, al igual que la frenolog&iacute;a, pierde valor (1). Posteriormente, Aleksandr Luria, tomando como base las teor&iacute;as de Jackson, Vygotsky, Pavlov, Berstein y otros, plantea que para entender el funcionamiento del cerebro se deb&iacute;an reconsiderar todos los conceptos existentes de la &eacute;poca, en cuanto a la relaci&oacute;n cerebro-funciones cerebrales.</p>      ]]></body>
<body><![CDATA[<p>Cuando se habla de funci&oacute;n cerebral superior, esta debe entenderse como un sistema funcional complejo y no como una funci&oacute;n aislada; as&iacute;, por ejemplo, no debe entenderse como an&aacute;loga a la tiroides y la secreci&oacute;n de tiroxina, sino como similar al sistema respiratorio, que incluye muchos &oacute;rganos del cuerpo funcionando al mismo tiempo y cada uno realiza una funci&oacute;n espec&iacute;fica que resulta necesaria para el proceso final, respirar (2). Al cambiar el concepto de funci&oacute;n cerebral a sistema funcional complejo, las funciones no pueden localizarse en zonas restringidas de la corteza cerebral o en grupos de c&eacute;lulas aislados, &ldquo;sino que deben estar organizados en sistemas de zonas que trabajan arm&oacute;nicamente, cada una de las cuales ejerce su papel dentro del sistema funcional complejo, y que pueden estar situadas en &aacute;reas completamente diferentes, y a menudo, muy distantes del cerebro&quot; (3). Por ejemplo, para realizar una actividad cognitiva como leer se requiere de varios componentes cerebrales, como: 1. control inhibitorio del comportamiento y la atenci&oacute;n, ejecutado por los l&oacute;bulos frontales, 2. an&aacute;lisis visual que permita el reconocimiento y discriminaci&oacute;n de los grafemas y palabras, actividad que ejecuta el l&oacute;bulo occipital, 3. discriminaci&oacute;n de grafemas similares y el espacio dentro de la hoja, ejecutado por &aacute;reas temporo-parieto-occipitales, y 4. comprensi&oacute;n del sentido y signos de puntuaci&oacute;n, ejecutado por los l&oacute;bulos frontales, etc. (2).</p>      <p>Para definir los componentes de cada actividad cognitiva Luria propuso el concepto de &ldquo;factor&rdquo;, que permite relacionar el nivel psicol&oacute;gico de la actividad humana con sus mecanismos psicofisiol&oacute;gicos. Ninguna acci&oacute;n o actividad cognitiva puede realizarse con un solo factor, o con la activaci&oacute;n de una sola zona cerebral. La realizaci&oacute;n de cada acci&oacute;n o actividad cognitiva requiere de la participaci&oacute;n de diversos factores neuropsicol&oacute;gicos, es decir, de la activaci&oacute;n de diferentes zonas cerebrales, las cuales constituyen un sistema funcional complejo (2, 3).</p>      <p>En la <a href="#t1">Tabla 1</a> se presentan algunos factores que participan en las diversas tareas cognitivas, su funci&oacute;n y las &aacute;reas cerebrales que involucran (4). Se considera que estos factores son insuficientes para explicar todos los procesos cognitivos, en especial los m&aacute;s elaborados como: abstracci&oacute;n, an&aacute;lisis, s&iacute;ntesis, toma de decisiones, etc.</p>      <p>    <center><a name="t1"><img src="img/revistas/anco/v31n1/v31n1a14t1.jpg"></a></center></p>      <p>El an&aacute;lisis de cada factor que est&aacute; involucrado en cada actividad cognitiva determinada y las estructuras cerebrales que constituyen su base es la labor del neuropsic&oacute;logo. Este se lleva a cabo a trav&eacute;s de la evaluaci&oacute;n con test o bater&iacute;as neuropsicol&oacute;gicas(2). Este an&aacute;lisis, antes basado exclusivamente en la cl&iacute;nica neuropsicol&oacute;gica, actualmente se puede hacer con el apoyo de t&eacute;cnicas de neuroimagen. La radiolog&iacute;a y la neuropsicolog&iacute;a se unen para hacer un trabajo conjunto gracias al desarrollo de t&eacute;cnicas de neuroimagen(5), en especial la resonancia magn&eacute;tica funcional, que permite el estudio de los cambios fisiol&oacute;gicos del cerebro relacionados con procesos mentales durante la ejecuci&oacute;n de una tarea (6). Si partimos de la perspectiva de la neuropsicolog&iacute;a tradicional, en la que a cada sistema funcional (constituido por diversos factores cognitivos, entendidos como etapas de procesamiento) le corresponde un sistema cerebral (trabajo de diferentes regiones), entonces podemos establecer que la informaci&oacute;n que obtendremos de las im&aacute;genes de resonancia magn&eacute;tica funcional estar&aacute; orientada a conocer los sustratos anat&oacute;micos de los factores (7).</p>      <p>El uso de la resonancia magn&eacute;tica funcional se dio inicialmente por Belleveau y sus colaboradores en 1991, para demostrar que la percepci&oacute;n de est&iacute;mulos visuales incrementa el flujo sangu&iacute;neo en el c&oacute;rtex visual primario (8, 9). La popularidad de esta t&eacute;cnica se puede ver en m&uacute;ltiples trabajos de investigaci&oacute;n en la literatura cient&iacute;fica, aunque no todos los trabajos llegan a las mismas conclusiones. Algunos de estos trabajos son: </p> <ol>-	Estudios con pacientes con trastorno obsesivo compulsivo (TOC) (10-16), donde se hace comparaci&oacute;n de las &aacute;reas activadas ante determinadas tareas con sujetos sanos, y se pone de manifiesto que las posibles &aacute;reas implicadas en el TOC incluyen el c&oacute;rtex orbitofrontal, el estriado y el c&iacute;ngulo anterior. Otros autores han encontrado hiperactividad en el c&oacute;rtex cingulado, tanto anterior como posterior.</p>      <p>- 	Propuestas respecto de pacientes con diagn&oacute;stico de esquizofrenia (17-20) y alucinaciones auditivas en la esquizofrenia, que afirman que a la base de las alucinaciones habr&iacute;a una disfunci&oacute;n de las redes neuronales responsables de la generaci&oacute;n del lenguaje oral mediante una activaci&oacute;n en paralelo de las &aacute;reas de la percepci&oacute;n del lenguaje externo (c&oacute;rtex auditivo-ling&uuml;&iacute;stico) y de las &aacute;reas motoras implicadas en el lenguaje subvocal.</p>      <p>-	Estudios con esclerosis m&uacute;ltiple (21, 22), utilizando distintos paradigmas para evaluar procesos como: memoria de trabajo y velocidad de procesamiento, en los que se encontr&oacute; mayor activaci&oacute;n del c&oacute;rtex frontal y en ocasiones en c&oacute;rtex parietal en pacientes comparados con participantes sanos. Tambi&eacute;n se pudo establecer que los pacientes con esclerosis m&uacute;ltiple cuando presentan un deterioro cognitivo &ldquo;leve&rdquo;, es decir, que logran concluir con &eacute;xito las tareas propuestas pero requieren activar m&aacute;s &aacute;reas cerebrales que una persona sana, lo cual se ha definido como activaci&oacute;n compensatoria. Adem&aacute;s, los patrones de desactivaci&oacute;n en reposo (red neural por defecto o en ingl&eacute;s default-mode network) son distintos en estos pacientes, no son inversamente proporcionales al patr&oacute;n de activaci&oacute;n, sobre todo en pacientes con el fenotipo primaria progresiva. (23-25).</p>      <p>- 	Investigaciones que proponen a los estudios de resonancia magn&eacute;tica funcional como biomarcador para el diagn&oacute;stico de enfermedad de Alzheimer temprana. Se ha logrado establecer con tareas de memoria epis&oacute;dica que las &aacute;reas que se activan en sujetos sanos son las del l&oacute;bulo temporal medial incluyendo activaci&oacute;n del hipocampo y estructuras relacionadas (26-29). Esta activaci&oacute;n se ve disminuida en personas con antecedentes familiares de demencia tipo enfermedad de Alzheimer y personas con diagn&oacute;stico de d&eacute;ficit cognitivo, condici&oacute;n que se considera un predictor de la enfermedad. (30, 31).     ]]></body>
<body><![CDATA[</ol>     <p>En Colombia el uso de la resonancia magn&eacute;tica funcional no es frecuente; se hace ocasionalmente y s&oacute;lo para establecer la lateralizaci&oacute;n de las funciones cerebrales superiores para definir mapas quir&uacute;rgicos.</p>      <p><B>Funciones del neuropsic&oacute;logo en estudios con resonancia magn&eacute;tica funcional</B></p>      <p>Para realizar una resonancia magn&eacute;tica funcional con &eacute;xito es indispensable la participaci&oacute;n de un equipo multidisciplinario, conformado por un neuroradi&oacute;logo, un t&eacute;cnico en resonancia, un bioingeniero y un neuropsic&oacute;logo. La funci&oacute;n del neuropsic&oacute;logo para estudios con resonancia magn&eacute;tica funcional es determinante e irremplazable, e incluye aspectos como: </p> <ol>    <li> Realizar una evaluaci&oacute;n neuropsicol&oacute;gica al paciente previa a la resonancia magn&eacute;tica funcional, que permita: establecer un perfil neuropsicol&oacute;gico del paciente y, con esta informaci&oacute;n, seleccionar los paradigmas apropiados para su evaluaci&oacute;n seg&uacute;n los hallazgos. Por otro lado, debe permitir que se entrene al paciente para el estudio de resonancia magn&eacute;tica funcional. Es importante establecer el perfil neuropsicol&oacute;gico del paciente porque la resonancia magn&eacute;tica funcional no permite valorar el estado de todos los procesos cognitivos ni tampoco determinar el grado de severidad de una alteraci&oacute;n cognitiva. Tampoco se puede conocer el desempe&ntilde;o del sujeto en diferentes tareas como escritura, c&aacute;lculo escrito y praxias, por la limitaci&oacute;n en la movilidad dentro del magneto.</li>     <li> Dise&ntilde;o de tareas o paradigmas. Un paradigma es un conjunto de est&iacute;mulos que, organizados con determinadas pautas temporales y de dise&ntilde;os, conforma las tareas que debe desempe&ntilde;ar el sujeto durante la adquisici&oacute;n de las im&aacute;genes por resonancia magn&eacute;tica funcional. Por medio de los paradigmas se ponen en marcha procesos cognitivos para localizar la arquitectura funcional subyacente a ellos. El dise&ntilde;o de los paradigmas debe tener una alta especificidad, equiparable a la especificidad de las bater&iacute;as neuropsicol&oacute;gicas, donde se busca independizar los factores de cada funci&oacute;n cerebral superior para evaluar lo que realmente se pretende. Deben poder replicarse para estudios control y estar dise&ntilde;ados acorde al nivel educativo del sujeto. As&iacute; mismo, deben estar basados en un s&oacute;lido conocimiento de los procesos cognitivos a estudiar, as&iacute; como de sus posibles interacciones con otros procesos que pueden ser reclutados durante el experimento (32). </li>     <p>Existen b&aacute;sicamente dos tipos de dise&ntilde;os: </p>      <p>A.	Dise&ntilde;os por bloques: se presentan dos situaciones, una de activaci&oacute;n con un est&iacute;mulo espec&iacute;fico y otra de control o reposo, con un est&iacute;mulo neutro que evita la activaci&oacute;n. Las caracter&iacute;sticas que aseguran su &eacute;xito son: duraci&oacute;n para obtener una potencia de contraste m&aacute;xima entre activaci&oacute;n y control (generalmente entre 20 y 30 segundos), periodicidad de los bloques (cada 5 segundos y buscando que la condici&oacute;n de reposo coincida con la respiraci&oacute;n del evaluado para evitar variables extra&ntilde;as), n&uacute;mero de bloques (a mayor n&uacute;mero de bloques, mayor potencia de contraste) y, por &uacute;ltimo, n&uacute;mero de condiciones (4 por cada serie de bloques). El dise&ntilde;o por bloques tiene las ventajas de poder implementarse y analizarse con facilidad y de tener alta potencia estad&iacute;stica.</p>      <p>B. 	Dise&ntilde;os ligados a eventos: se caracterizan por presentar las condiciones en forma aleatoria. Tal es el caso de las tareas oddball, una tarea de reconocimiento de un est&iacute;mulo infrecuente que se intercala de forma aleatoria con la probabilidad de baja aparici&oacute;n entre una serie repetitiva de otro est&iacute;mulo m&aacute;s frecuente, ante el cual no se debe dar ninguna respuesta (33). Los dise&ntilde;os ligado a eventos son menos susceptibles a fen&oacute;menos de habituaci&oacute;n, expectaci&oacute;n y a la disminuci&oacute;n de la atenci&oacute;n. Sin embargo, comparado con el dise&ntilde;o en bloques, estos dise&ntilde;os tienen una potencia estad&iacute;stica menor (34).</p>     <li> Supervisi&oacute;n del paciente mientras ejecuta los paradigmas, para control experimental de las variables externas como cansancio, sue&ntilde;o o desinter&eacute;s (35).</li>     ]]></body>
<body><![CDATA[<li> Apoyo en la interpretaci&oacute;n de los resultados, estableciendo relaci&oacute;n entre las &aacute;reas cerebrales activadas y los factores de la funci&oacute;n cerebral evaluada por medio de los paradigmas (5).</li>    </ol>      <p><B>Aplicaciones y usos de la resonancia magn&eacute;tica funcional en el contexto cl&iacute;nico</B></p>      <p>Existen diversas &aacute;reas y disciplinas donde la resonancia magn&eacute;tica funcional juega un rol importante. Entre las funciones que cumple se encuentran las siguientes:</p> <ol>    <li> Permite localizar un proceso cognitivo, tanto para definir la organizaci&oacute;n funcional del cerebro como para planear una cirug&iacute;a (36,37). Mapas funcionales y prequir&uacute;rgicos. Permite definir la distancia entre una determinada funci&oacute;n y la lesi&oacute;n que se va a tratar e identificar los efectos de la lesi&oacute;n en la representaci&oacute;n cortical de la funci&oacute;n (38-40). </li>     <li> Permite estudiar el funcionamiento irregular del cerebro en pacientes, estableciendo si hay cambios en las &aacute;reas activadas comparados con sujetos sanos. As&iacute;, permite caracterizar enfermedades neurol&oacute;gicas y psiqui&aacute;tricas.</li>     <li> Caracteriza las respuestas y funci&oacute;n de determinadas regiones del cerebro. </li>     <li> Eval&uacute;a c&oacute;mo se dan los procesos de plasticidad cerebral por rehabilitaci&oacute;n cognitiva y actividades compensatorias. Por ejemplo, en pacientes con esclerosis m&uacute;ltiple (41), comprensi&oacute;n auditiva en pacientes con afasia (42) y nuevo patr&oacute;n de conectividad entre hemisferios cerebrales meses despu&eacute;s del inicio del tratamiento en paciente con afasia (43). </li>     <li> Establece la conectividad funcional y efectiva, que difieren de la conectividad estructural que se observa mediante im&aacute;genes de tensor de difusi&oacute;n. Esta conectividad funcional permite estudiar patrones de activaci&oacute;n en distintas regiones del cerebro as&iacute; como su interacci&oacute;n fundamentalmente en patolog&iacute;as neurol&oacute;gicas o psiqui&aacute;tricas que no se deben a un da&ntilde;o focal, sino a alteraciones en la transferencia de la informaci&oacute;n entre las regiones neuronales (44,45).</li>     <li> Permite hacer seguimiento a tratamientos farmacol&oacute;gicos. Constituya un biomarcador objetivo para evaluar la respuesta terap&eacute;utica y el pron&oacute;stico de los pacientes (46). </li>     ]]></body>
<body><![CDATA[<li> Permite definir la dominancia hemisf&eacute;rica para funciones cerebrales espec&iacute;ficas. </li>    </ol>      <p><B>Activaci&oacute;n de &aacute;reas cerebrales en resonancia magn&eacute;tica funcional ante diferentes tareas cognitivas</B></p>      <p>Para la interpretaci&oacute;n de las &aacute;reas de activaci&oacute;n cerebral, adem&aacute;s de tener conocimiento de los procesos neurocognitivos involucrados en los paradigmas utilizados en el estudio, hay que tener en cuenta varias consideraciones y evitar errores en la interpretaci&oacute;n. Primero, es necesario considerar las diferencias individuales: conocer que pueden presentarse diferentes situaciones que afectan el acoplamiento neurovascular y que generan diferencias entre los individuos en el estado de oxigenaci&oacute;n. Entre estas pueden estar la isquemia cerebral cr&oacute;nica, la proliferaci&oacute;n de astrocitos debido a una lesi&oacute;n cerebral que causa gliosis, hipertensi&oacute;n arterial, diabetes o hipercolesterolemia y los efectos de algunos medicamentos (47). Segundo, durante el reposo en los paradigmas de dise&ntilde;o en bloques se pueden activar regiones como la corteza ventral medial prefrontal o &aacute;rea de Brodmann 10 y el Prec&uacute;neo o &aacute;rea 7 de Brodmann; esto corresponde a activaci&oacute;n del &ldquo;default-mode network&rdquo; ampliamente caracterizado en resonancia funcional en estado de reposo. Entre mayor sea el nivel educativo y por ende la reserva cognitiva se observar&aacute; mayor actividad en el estado de reposo (48). Tercero, hay que tener en cuenta que el hecho de que un &aacute;rea se active durante la ejecuci&oacute;n de una tarea no implica que esa &aacute;rea sea indispensable para la tarea en cuesti&oacute;n (49). Cuarto, inversamente, el que no se activen algunas &aacute;reas esperadas durante la ejecuci&oacute;n de una tarea, no permite asumir que no participan en el proceso; es posible que participen pero que  esto no sea capturado (50).</p>      <p>Se presentan a continuaci&oacute;n, en la <a href="#t2">Tabla 2</a>, las &aacute;reas que se activan ante diferentes paradigmas, obtenidas en estudios con sujetos sanos, sin antecedentes neurol&oacute;gicos, metab&oacute;licos, psiqui&aacute;tricos o que reciban tratamientos farmacol&oacute;gicos.</p>      <p>    <center><a name="t2"><img src="img/revistas/anco/v31n1/v31n1a14t2.jpg"></a></center></p>      <p><b><font size="3">CONCLUSIONES</font></b></p>      <p>La resonancia magn&eacute;tica funcional representa un avance de las neurociencias y est&aacute; ayudando a dilucidar in vivo el funcionamiento cerebral. Permite, gracias a la activaci&oacute;n, la localizaci&oacute;n de los diferentes factores de las funciones cerebrales en &aacute;reas determinadas del cerebro, factores que han sido definidos hasta el momento pero siendo conscientes de que son insuficientes para explicar todos los procesos cognitivos. Tambi&eacute;n permite entender el funcionamiento cerebral en sujetos sanos a diferencia de otras t&eacute;cnicas que solo se realizan cuando se presentan las lesiones y ampl&iacute;a el conocimiento de las enfermedades neurol&oacute;gicas y psiqui&aacute;tricas, sobre todo de las que no se pueden observar con t&eacute;cnicas de neuroimagen. Esto &uacute;ltimo quiz&aacute; hace posible acercar estas especialidades hist&oacute;ricamente disociadas.</p>      <p>Gracias a los diferentes mapas de activaci&oacute;n cerebral nos acercamos m&aacute;s a la neuropsicolog&iacute;a cl&aacute;sica de Luria y nos alejamos del localizacionismo puro, de la frenolog&iacute;a o de las voces no&eacute;ticas de las funciones cerebrales. Se confirma que una tarea cognitiva requiere de varias &aacute;reas cerebrales, incluso distantes, trabajando arm&oacute;nicamente, ya que es un sistema funcional. Sin embargo, para entender las redes neuronales estructurales que establecen relaci&oacute;n entre las &aacute;reas activadas es necesario completar los estudios con im&aacute;genes de tensor de difusi&oacute;n.</p>      ]]></body>
<body><![CDATA[<p>La funci&oacute;n del neuropsic&oacute;logo es determinante en la realizaci&oacute;n de estudios de resonancia funcional con tareas, pues este puede crear los paradigmas gracias al conocimiento sobre las funciones cerebrales superiores y lo que subyace a estas. As&iacute; mismo puede independizar los &ldquo;factores&rdquo; para evitar contaminaci&oacute;n o artefactos que le resten validez al estudio, puede adecuar los paradigmas a las limitaciones del paciente, como el nivel educativo, por ejemplo. Adicionalmente, debe ayudar a controlar al sujeto durante el estudio para evitar la introducci&oacute;n de variables extra&ntilde;as y apoyar en la interpretaci&oacute;n de los resultados.</p>      <p><B>Agradecimientos</B></p>      <p>A la doctora Ana Cecilia Londo&ntilde;o, Neuroradiologa, por su asesor&iacute;a.</p>      <p><B>Conflicto de intereses</B></p>      <p>Los autores declaran no tener conflicto de intereses.</p>  <hr>     <p><font size="3"><B>Referencias</b></font></p>      <!-- ref --><p>1. 	ANOKHIN P.K. Problemas claves de la teor&iacute;a del sistema funcional. Mosc&uacute;: Ciencia; 1980.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000069&pid=S0120-8748201500010001400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>2. 	LURIA, A.R. Las funciones corticales superiores del hombre. Distribuciones Fontamara. S.A.; 1986.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000071&pid=S0120-8748201500010001400002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
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