<?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>1794-4724</journal-id>
<journal-title><![CDATA[Avances en Psicología Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Av. Psicol. Latinoam.]]></abbrev-journal-title>
<issn>1794-4724</issn>
<publisher>
<publisher-name><![CDATA[Universidad del Rosario]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1794-47242008000200005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El maltrato infantil: mecanismos subyacentes]]></article-title>
<article-title xml:lang="en"><![CDATA[Child abuse: underlying mechanisms]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[Gladys S.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Fundación Universitaria Los Libertadores  ]]></institution>
<addr-line><![CDATA[Bogotá D. C.]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>26</volume>
<numero>2</numero>
<fpage>171</fpage>
<lpage>179</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1794-47242008000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1794-47242008000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1794-47242008000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Exposure to traumatic stress during childhood, in the form of abuse or neglect, is related to an increased vulnerability resulting in the development of several pathologies, this relation has been confirmed by epidemiological studies; however, the neural mechanisms underlying such abnormalities are still unknown. Most of the research done has focused on the effects in the infant, and only recently it has begun to focus on the neurobiological changes in the abusive parents. In this article, I review some of the studies using animal models of early adverse trauma and present some of the data on neural changes. Further studies of brain abnormalities in abusive parents are still needed.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La exposición durante la infancia a estrés traumático, en la forma de abuso o negligencia, está asociada con una mayor vulnerabilidad, la cual resulta en el desarrollo de diversas psicopatologías, relación que ha sido confirmada una y otra vez en estudios epidemiológicos; sin embargo, aún se desconocen los mecanismos neurales que subyacen dichas alteraciones y solo recientemente se han empezado a estudiar los cambios neurobiológicos subyacentes en padres y madres maltratadores. En esta revisión se resumen investigaciones en que se ha abordado esta temática y se presentan algunos de los modelos animales usados para su estudio.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[maternal care]]></kwd>
<kwd lng="en"><![CDATA[maternal separation]]></kwd>
<kwd lng="en"><![CDATA[maltreatment]]></kwd>
<kwd lng="es"><![CDATA[cuidado maternal]]></kwd>
<kwd lng="es"><![CDATA[separación materna]]></kwd>
<kwd lng="es"><![CDATA[maltrato]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="Verdana" size="3">    <p align="center"><b>El maltrato infantil: mecanismos subyacentes</b></p></font> <font face="Verdana" size="2">    <p align="center"><b>Child abuse: underlying mechanisms</b></p>     <p align="center">Gladys S. Mart&iacute;nez*</p>     <p>* <i>Fundaci&oacute;n Universitaria Los Libertadores, Colombia</i>. Correspondencia: Gladys S. Mart&iacute;nez, Facultad de Psicolog&iacute;a, Fundaci&oacute;n Universitaria Los Libertadores, carrera 16 No. 63 A 68, Bogot&aacute;, D. C., Colombia. Correo electr&oacute;nico: <a href="mailto:marti436@msu.edu">marti436@msu.edu</a>.</p>     <p><b>Fecha de recepci&oacute;n: agosto de 2008    <br> Fecha de aceptaci&oacute;n: octubre de 2008</b></p> <hr>     <p align="center"><b>Abstract</b></p>     <p>Exposure to traumatic stress during childhood, in the form of abuse or neglect, is related to an increased vulnerability resulting in the development of several pathologies, this relation has been confirmed by epidemiological studies; however, the neural mechanisms underlying such abnormalities are still unknown. Most of the research done has focused on the effects in the infant, and only recently it has begun to focus on the neurobiological changes in the abusive parents. In this article, I review some of the studies using animal models of early adverse trauma and present some of the data on neural changes. Further studies of brain abnormalities in abusive parents are still needed.</p>     <p><i>Key words</i>: maternal care; maternal separation; maltreatment.</p>     ]]></body>
<body><![CDATA[<p align="center"><b>Resumen</b></p>     <p>La exposici&oacute;n durante la infancia a estr&eacute;s traum&aacute;tico, en la forma de abuso o negligencia, est&aacute; asociada con una mayor vulnerabilidad, la cual resulta en el desarrollo de diversas psicopatolog&iacute;as, relaci&oacute;n que ha sido confirmada una y otra vez en estudios epidemiol&oacute;gicos; sin embargo, a&uacute;n se desconocen los mecanismos neurales que subyacen dichas alteraciones y solo recientemente se han empezado a estudiar los cambios neurobiol&oacute;gicos subyacentes en padres y madres maltratadores. En esta revisi&oacute;n se resumen investigaciones en que se ha abordado esta tem&aacute;tica y se presentan algunos de los modelos animales usados para su estudio.</p>     <p><i>Palabras clave</i>: cuidado maternal; separaci&oacute;n materna; maltrato.</p> <hr>     <p align="center"><b>Introducci&oacute;n</b></p>     <p>A nivel mundial, las estad&iacute;sticas de maltrato infantil son alarmantes. La Organizaci&oacute;n Mundial de la Salud (OMS) report&oacute; en el 2000 un estimado de 57.000 homicidios de ni&ntilde;os menores de 15 a&ntilde;os, siendo mayor la tasa en el caso de ni&ntilde;os entre 0 y 4 a&ntilde;os. Igualmente, en su informe la OMS se&ntilde;ala que el abuso cuyas consecuencias no son fatales es aun mayor: en Estados Unidos, por ejemplo, se reportaron 906.000 casos de maltrato infantil en 2003; de manera similar, en pa&iacute;ses como Chile (4%) e India (36%), las madres admiten golpear a sus hijos con un objeto (en partes del cuerpo distintas a las nalgas) (World Health Organization, 2005).</p>     <p>El riesgo de maltrato aumenta, de manera particular, en regiones en las cuales los ni&ntilde;os est&aacute;n permanentemente expuestos a tratos inadecuados y situaciones de conflicto, como en el caso de Colombia, un pa&iacute;s en donde la situaci&oacute;n de violencia ha empeorado con el paso de los a&ntilde;os. De acuerdo con datos suministrados por el Instituto Nacional de Medicina Legal, mientras que en el 2001 hubo 69.681 casos de violencia intrafamiliar, en el 2006 dicho n&uacute;mero aument&oacute; a 72.849 (un incremento aproximado del 4%). Esta tendencia al aumento es a&uacute;n m&aacute;s significativa en el caso espec&iacute;fico del maltrato a menores de edad.</p>     <p>Mientras que en el 2001 s&oacute;lo 10.921 de los casos de violencia intrafamiliar corresponden a agresiones f&iacute;sicas a menores de edad por parte de alguno de sus familiares (aproximadamente un 15%), en 2006 el n&uacute;mero aument&oacute; a 13.540, es decir, un aumento aproximado de 18% (Garc&iacute;a Ru&iacute;z, 2001; Sierra Fajardo, Macanta Tuta y Cort&eacute;s Callejas, 2006). Un estudio con internos de una c&aacute;rcel de Bogot&aacute; confirm&oacute; esta relaci&oacute;n entre maltrato infantil y violencia: sin excepci&oacute;n, los sujetos de grupos de consumidores con historia de delincuencia recibieron golpizas durante su infancia que dejaron huellas y cicatrices de alto impacto; igualmente, estudios con adolescentes mostraron una alta correlaci&oacute;n entre historia de maltrato f&iacute;sico y conductas adictivas y violentas (Ram&iacute;rez, 2006).</p>     <p>La exposici&oacute;n durante la infancia a estr&eacute;s traum&aacute;tico, en la forma de abuso o negligencia, est&aacute; asociada con una mayor vulnerabilidad que resulta en el desarrollo de diversas psicopatolog&iacute;as. Estudios cl&iacute;nicos muestran que el maltrato infantil est&aacute; asociado con cambios en estructuras del cerebro tales como disminuciones en el volumen del hipocampo (Bremner et al., 1997; Villarreal et al., 2002), el cuerpo calloso (Teicher et al., 2004) y la corteza prefrontal (De Bellis et al., 2002), entre otras &aacute;reas y/o alteraciones en los mecanismos neurobiol&oacute;gicos que regulan las conductas emocionales y las respuestas al estr&eacute;s. El maltrato infantil temprano aumenta la probabilidad de desarrollar problemas de ansiedad, est&aacute; asociado con una mayor vulnerabilidad a desordenes de estr&eacute;s postraum&aacute;tico (De Bellis, 2005; De Bellis et al., 2002), con des&oacute;rdenes en el estado de &aacute;nimo, y con bajo control de los impulsos (Freyd et al., 2005) (Mullen, Martin, Anderson, Romans y Herbison, 1996).</p>     <p>En particular, el maltrato infantil ha sido reconocido como elemento que predispone a la violencia, a la agresi&oacute;n impulsiva y al desarrollo de conductas antisociales en la adultez (Crooks, Scott, Wolfe, Chiodo, y Killip, 2007; Loeber y Dishion, 1983; Loeber y Stouthamer-Loeber, 1998). El maltrato no tiene que ser exclusivamente f&iacute;sico para que tenga efectos posteriores en el desarrollo. La negligencia emocional (incluyendo el ser testigos de formas extremas de violencia dom&eacute;stica), m&eacute;dica, f&iacute;sica y educacional afectan tambi&eacute;n de manera importante el crecimiento (Johnson et &aacute;l., 1992), el desarrollo cognitivo e intelectual (Beers y De Bellis, 2002; Strathearn, Gray, O'Callaghan y Wood, 2001; Trickett y Mcbridechang, 1995) el riesgo de obesidad (Lissau y Sorensen, 1994) y la probabilidad de desarrollar trastornos de ansiedad, incluyendo depresi&oacute;n (Gottman, 1998).</p>     <p>Los cambios neurales que subyacen, los efectos de experiencias adversas tempranas no son a&uacute;n del todo claros. Algunos estudios sugieren efectos en sistemas monoamin&eacute;rgicos, incluyendo un incremento en la expresi&oacute;n de receptores serotonin&eacute;rgicos en la corteza y en el hipocampo (V&aacute;zquez, Eskandari, Zimmer, Levine y L&oacute;pez, 2002), en la respuesta noradren&eacute;rgica (Liu, Caldji, Sharma, Plotsky y Meaney, 2000), y en la liberaci&oacute;n de dopamina en el n&uacute;cleo Accumbens (Meaney, Brake y Gratton, 2002), aumento en la sensibilidad hipocampal al glutamato —y m&aacute;s espec&iacute;ficamente un aumento en el nivel de receptores NMDA— (Liu, Diorio, Day, Francis y Meaney, 2000; Roceri, Hendriks, Racagni, Ellenbroek y Riva, 2002). La reducci&oacute;n en la respuesta noradren&eacute;rgica al estr&eacute;s, caracter&iacute;stica de cr&iacute;as de madres que lamen y acicalan a sus cr&iacute;as con frecuencia, ha sido relacionada con un aumento en la inhibici&oacute;n GABA &eacute;rgica de sistemas que regulan la respuesta emocional, conductual y endocrina al estr&eacute;s (Caldji, Diorio y Meaney, 2000).</p>     ]]></body>
<body><![CDATA[<p align="center"><b>Modelos animales para el estudio de experiencias adversas tempranas</b></p>     <p>En general, en mam&iacute;feros, los efectos nocivos asociados a alteraciones en la conducta parental son particularmente fuertes (Barr et &aacute;l., 2003; Denenberg y Whimby, 1963), por cuanto hay una relaci&oacute;n estrecha y relativamente larga entre la madre y sus cr&iacute;as (Reinhold, 2002) e incluso entre el padre y sus cr&iacute;as, como ocurre en los humanos y en algunas especies de roedores (Lonstein y De Vries, 1999). Aunque estudios epidemiol&oacute;gicos confirman una y otra vez la relaci&oacute;n entre experiencias tempranas adversas y alteraciones en la adultez, a&uacute;n se desconocen los mecanismos neurales que subyacen dichas alteraciones. Un campo potencialmente &uacute;til para entender los efectos de experiencias adversas tempranas es el uso de modelos animales. En roedores, la investigaci&oacute;n sobre maltrato se ha valido de protocolos en los cuales el animal es sometido a formas adversas de experiencia temprana (i.e., separaci&oacute;n materna por periodos prolongados). Esta estrategia se ha usado para estudiar experimentalmente los efectos de manipulaciones postnatales de la interacci&oacute;n madre-hijo, una investigaci&oacute;n cuyos pioneros fueron Seymour Levine y V&iacute;ctor Denenberg (Denenberg y Whimby, 1963; Levine, Haltmeyer, Karas y Denemberg, 1967). Se han usado m&uacute;ltiples variaciones del paradigma inicialmente propuesto, variaciones que han incluido cambios en la duraci&oacute;n del periodo de separaci&oacute;n (de 1-24 horas), en el n&uacute;mero de d&iacute;as durante los cuales se hacen los episodios de separaci&oacute;n (1-14 d&iacute;as durante las primeras dos semanas postnatales) y en los grupos comparados (para una discusi&oacute;n sobre las diferencias en los protocolos, v&eacute;ase Lehmann y Feldon, 2000).</p>     <p>La separaci&oacute;n materna prolongada parece estar asociada con un aumento en la agresi&oacute;n entre machos y un aumento en la depresi&oacute;n, as&iacute; como con alteraciones de largo plazo en el comportamiento emocional y en el comportamiento defensivo, y con alteraciones en el desarrollo de sistemas neurales involucrados en comportamientos relacionados con el reforzamiento (Caldji, Francis, Sharma, Plotsky y Meaney, 2000; Fleming, Corter, Stallings y Steiner, 2002; Francis y Meaney, 1999; Liu et al., 1997; Romeo et al., 2003; Veenema, Blume, Niederle, Buwalda y Neumann, 2006). Algunas investigaciones incluso han sugerido una relaci&oacute;n entre la separaci&oacute;n materna y un incremento en el consumo de alcohol (Huot, Thrivikraman, Meaney y Plotsky, 2001).</p>     <p>En primates no humanos, estudios iniciales con monos rhesus mostraron que hembras que hab&iacute;an sido separadas de sus madres al nacer, y que hab&iacute;an sido criadas en aislamiento social o con madres sustitutas (de alambre o cubiertas con telas burdas), exhib&iacute;an respuestas negativas hacia sus cr&iacute;as, incluyendo negligencia, rechazo de contacto con el infante, golpes, mordeduras, y mutilaciones, entre otras (Harlow, Harlow, Dodsworth y Arling, 1966; Seay, Alexander y Harlow, 1964). Aunque este fue un primer punto de partida en la investigaci&oacute;n sobre el maltrato infantil, se hizo evidente r&aacute;pidamente que este modelo animal ten&iacute;a grandes limitaciones por cuanto involucraba simult&aacute;neamente formas de aislamiento y deprivaci&oacute;n social extremas cuyos efectos no se limitaban exclusivamente a la conducta parental, sino que produc&iacute;an adem&aacute;s graves patolog&iacute;as sociales (Maestripieri y Wallen, 1997).</p>     <p>Investigaciones posteriores con monos que viven en grupos confirmaron los efectos de experiencias traum&aacute;ticas en la conducta materna y adem&aacute;s evidenciaron semejanzas entre estos y los humanos en la prevalencia del abuso (Maestripieri, 1998, 1999; Maestripieri, Wallen y Carroll, 1997), la transmisi&oacute;n de una generaci&oacute;n a otra de las formas de maltrato (Maestripieri, 2005; Maestripieri, Lindell y Higley, 2007), los efectos del maltrato en etapas tempranas del desarrollo (Maestripieri et al., 2006) y algunas caracter&iacute;sticas psicol&oacute;gicas de las madres maltratadoras (Maestripieri, 1998).</p>     <p>En contraste con los datos obtenidos con investigaciones que incluyen periodos prolongados de separaci&oacute;n materna, estudios en los que la separaci&oacute;n materna se ha limitado a periodos cortos sugieren un efecto positivo, espec&iacute;ficamente una disminuci&oacute;n de la reactividad emocional en etapas posteriores del desarrollo (Denenberg, 1999; Ladd et al., 2000; Meaney, 2001; Plotsky y Meaney, 1993). Esta forma de separaci&oacute;n materna produce cambios a largo plazo en funciones neuroendocrinas y en la respuesta conductual a elementos novedosos: animales que han sido manipulados de esta manera exhiben una reducida respuesta de alarma, un aumento en la exploraci&oacute;n en campo abierto, una reducci&oacute;n en la supresi&oacute;n de conductas de alimentaci&oacute;n ante situaciones novedosas, hiperactividad del eje hipot&aacute;lamo-hipofiso-adrenal (HPA) y, en general, una reducida respuesta al estr&eacute;s (Caldji, Francis et al., 2000; Francis y Meaney, 1999; Liu et al., 1997; S&aacute;nchez et al., 2005).</p>     <p>Estudios realizados por Meaney y su grupo sugieren que estos efectos positivos est&aacute;n mediados por cambios en las interacciones madre-hijo: cuando la hembra es reunida con sus cr&iacute;as despu&eacute;s de un periodo corto de separaci&oacute;n (~15 minutos), inmediatamente se acerca a ellas y restaura el cuidado maternal e incluso incrementa diversas formas de conducta materna tales como lamerlas, acicalarlas y amamantarlas (con la espalda arqueada) (Caldji et &aacute;l., 1998; Liu et al., 1997; Stern, 1997); si las cr&iacute;as son sometidas a est&iacute;mulos dolorosos, el incremento en la conducta maternal parece ser importante para evitar que las cr&iacute;as sensibilicen sus respuestas al dolor e incrementen su respuestas neuroendocrinas al estr&eacute;s (Walker, Kudreikis, Sherrard y Johnston, 2003).</p>     <p>Estos cambios en la manipulaci&oacute;n t&aacute;ctil por parte de la madre parecen ser los responsables de las consecuencias a largo plazo en la reactividad emocional y en la respuesta de estr&eacute;s de las cr&iacute;as: si se impide que la hembra incremente sus conductas de lamer y acicalar a la cr&iacute;a despu&eacute;s de un periodo de separaci&oacute;n de 15 minutos (inyect&aacute;ndole a la hembra un agente ansiol&iacute;tico), se bloquean los efectos positivos de la manipulaci&oacute;n materna en la conducta exploratoria de la cr&iacute;as y estas exploran menos y se muestran m&aacute;s ansiosas que cr&iacute;as de hembras no sometidas a dicho tratamiento (D'Amato, Cabib, Ventura y Orsini, 1998).</p>     <p>Estudios de variaciones naturales en la conducta materna confirman la importancia de las interacciones entre la madre y sus cr&iacute;as: cr&iacute;as de hembras que exhiben un mayor porcentaje de conductas de lamer, acicalar y amamantar en posici&oacute;n arqueada muestran una menor activaci&oacute;n del HPA en respuesta al estr&eacute;s y se muestran menos miedosas al explorar un ambiente nuevo, en comparaci&oacute;n con cr&iacute;as de hembras con bajos niveles de las mismas conductas (Caldji et &aacute;l., 1998; Liu et al., 1997). &iquest;Qu&eacute; ocurre entonces cuando la separaci&oacute;n materna se prolonga por un periodo m&aacute;s largo? En estudios en los cuales se asigna una camada adoptiva durante el periodo de separaci&oacute;n a hembras sometidas a periodos prolongados de separaci&oacute;n, las cr&iacute;as no muestran la hiperemocionalidad caracter&iacute;stica de cr&iacute;as sometidas a separaci&oacute;n prolongada (Huot, Gonz&aacute;lez, Ladd, Thrivikraman, &amp; Plotsky, 2004), lo que sugiere que el elemento clave que regula los efectos en las cr&iacute;as en estos casos es tambi&eacute;n la alteraci&oacute;n en la conducta materna.</p>     <p>Como nota final, es interesante anotar que la mayor&iacute;a de los estudios en los cuales se ha usado la separaci&oacute;n materna para el estudio del maltrato se han enfocado en sus efectos en las cr&iacute;as, y muy pocos estudios se han centrado en los efectos sobre la conducta materna. Un estudio inicial con ratas sometidas a varios periodos de separaci&oacute;n prolongada de sus cr&iacute;as mostr&oacute; cambios robustos y de larga duraci&oacute;n en la respuesta de las madres a respuestas novedosas (actividad locomotora en un espacio novedoso) y est&iacute;mulos aversivos: gastaron m&aacute;s tiempo en los brazos abiertos del laberinto elevado en cruz y emitieron m&aacute;s vocalizaciones ultras&oacute;nicas en respuesta a est&iacute;mulos auditivos alarmantes, comparadas con hembras no sometidas a dichos periodos de separaci&oacute;n, al tiempo que disminuyeron su sensibilidad a la morfina (Kalinichev, Easterling y Holtzman, 2000).</p>     ]]></body>
<body><![CDATA[<p align="center"><b>Transmisi&oacute;n entre generaciones del maltrato y alteraciones en la conducta maternal</b></p>     <p>Investigaciones hechas en Estados Unidos estiman que un 30% de los individuos que fueron maltratados o tratados negligentemente durante su infancia maltratar&aacute;n tambi&eacute;n a sus propios hijos (Chapman y Scott, 2001; Widom, 1989a, 1989b). En macacos, investigaciones longitudinales por un periodo de 33 a&ntilde;os mostraron que el abuso ocurre con mayor frecuencia en familias espec&iacute;ficas y tiene una alta probabilidad de ser repetido en cr&iacute;as sucesivas (Maestripieri y Carroll, 1998; Maestripieri y Wallen, 1997), aunque su transmisi&oacute;n puede verse afectada por factores ambientales: hembras de madres abusadores adoptadas por madres no abusadoras no abusan a sus propias cr&iacute;as (Maestripieri, 2005).</p>     <p>Investigaciones sobre variaciones naturales en la conducta materna muestran que formas particulares de conducta materna se mantienen estables a lo largo de diferentes camadas y sugieren que dichas formas de conducta maternal podr&iacute;an ser transmitidas de una generaci&oacute;n a otra. Varios estudios apuntan en esta direcci&oacute;n.</p>     <p>Cr&iacute;as de madres con altos niveles de conductas de lamer, acicalar y amamantar a sus cr&iacute;as con la espalda arqueada exhiben significativamente mayores niveles de estas mismas conductas con sus propias cr&iacute;as (Caldji, Diorio et &aacute;l., 2000); en monos brevet y monos rhesus la cantidad de tiempo gastado con las cr&iacute;as parecer ser heredado por l&iacute;nea materna (Fairbanks, 1989); hembras expuestas por poco tiempo a interacciones normales con sus madres, y que son destetadas tempranamente, exhiben niveles bajos de conducta materna con sus propias cr&iacute;as (Kikusui, Isaka y Mori, 2005); y finalmente, (4) hembras destetadas artificialmente de sus madres por periodos cortos o prolongados (en la forma de deprivacion materna) tienen deficiencias en la recuperaci&oacute;n de sus cr&iacute;as, lamen menos a sus cr&iacute;as y en general muestran menos conductas maternas (Fleming, Kraemer et al., 2002; Gonz&aacute;lez y Fleming, 2002; Lovic, Gonz&aacute;lez y Fleming, 2001).</p>     <p>Esta transmisi&oacute;n parece ser no gen&eacute;tica y parece estar asociada con diferencias en la conducta materna durante la primera semana de vida: cr&iacute;as biol&oacute;gicas de madres con niveles bajos de conductas maternas adoptadas por madres con niveles altos de conductas maternas se muestran menos temerosas ante situaciones novedosas que aquellos criados por madres con bajos niveles de conducta materna (Champagne, 2008; Francis, Diorio, Liu y Meaney, 1999). Recientemente se ha sugerido que los factores neurobiol&oacute;gicos que median dicha transmisi&oacute;n involucran interacciones entre estr&oacute;genos y oxitocina (Champagne, 2008).</p>     <p>La transmisi&oacute;n intergeneracional, en el caso especifico del abuso infantil, parece tambi&eacute;n estar mediada por factores no gen&eacute;ticos; hembras criadas por madres adoptivas y sometidas a maltrato exhiben tasas similares de rechazo de las cr&iacute;as a las exhibidas por sus madres adoptivas (Francis et al., 1999; Liu et al., 1997; Maestripieri et &aacute;l., 2007); igualmente, hembras macaco que fueron abusadas por sus madres en los primeros d&iacute;as de vida exhiben tambi&eacute;n conducta abusadora con sus primeras cr&iacute;as, independientemente de que hayan sido criadas por sus madres biol&oacute;gicas o por madres adoptivas (Maestripieri, 2005).</p>     <p align="center"><b>Notas finales</b></p>     <p>Aunque estudios con humanos y con primates no humanos confirman que de hecho la conducta maternal se transmite de una generaci&oacute;n a otra, no es claro si dicha transmisi&oacute;n obedece a factores gen&eacute;ticos o hay otros elementos involucrados. Estas caracter&iacute;sticas de la conducta maternal en condiciones naturales parecen aplicar tambi&eacute;n para conductas de maltrato, pero no hay estudios de larga escala que confirmen su transmisi&oacute;n y que eval&uacute;en posibles mecanismos que la hagan posible. Se han intentado diversas aproximaciones a esta tem&aacute;tica usando modelos animales que pueden ser utilizados en laboratorio, pero los resultados no parecen ser a&uacute;n conclusivos. Aunque se han identificado algunos substratos neurobiol&oacute;gicos asociados con dicha transmisi&oacute;n, quedan a&uacute;n preguntas sin responder; no es claro, por ejemplo, si esta forma de transmisi&oacute;n ocurre tambi&eacute;n en la conducta paterna, y si ocurre, cu&aacute;les son los mecanismos neurobiol&oacute;gicos que la subyacen. 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