Background: The study of the attentional system remains a challenge for current neuroscience. The “Attention Network Test” (ANT) was designed to study simultaneously three different attentional networks (alerting, orienting, and executive) based in subtraction of different experimental conditions. However, some studies recommend caution with these calculations due to the interactions between the attentional networks. In particular, it is highly relevant that several interpretations about attentional impairment have arisen from these calculations in diverse pathologies. Event related potentials (ERPs) and neural source analysis can be applied to disentangle the relationships between these attentional networks not specifically shown by behavioral measures.Results: This study shows that there is a basic level of alerting (tonic alerting) in the no cue (NC) condition, represented by a slow negative trend in the ERP trace prior to the onset of the target stimuli. A progressive increase in the CNV amplitude related to the amount of information provided by the cue conditions is also shown. Neural source analysis reveals specific modulations of the CNV related to a task-related expectancy presented in the NC condition; a late modulation triggered by the central cue (CC) condition and probably representing a generic motor preparation; and an early and late modulation for spatial cue (SC) condition suggesting specific motor and sensory preactivation. Finally, the first component in the information processing of the target stimuli modulated by the interaction between orienting network and the executive system can be represented by N1.Conclusions: The ANT is useful as a paradigm to study specific attentional mechanisms and their interactions. However, calculation of network effects is based in subtractions with non-comparable experimental conditions, as evidenced by the present data, which can induce misinterpretations in the study of the attentional capacity in human subjects.

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According to international and Mexican official statistics, there is a dramatic rise in suicide in Mexico; however, research in this area is severely limited. This is the first study of suicide notes from Mexico in the international literature. From a population of 747 registered suicides, a sample of 106 note-writers and 106 non-note writers was examined. Using the demographic (descriptive) scheme of Ho, Yip, Chiu, and Halliday (1998), the results indicate that note writers do not differ greatly from other suicides. The less educated understandably wrote fewer notes. The most intriguing finding was that suicide in Mexico was associated with an array of factors, notably interpersonal problems.

Evaluación de la Satisfacción Laboral en Docentes de Nivel BásicoEVAlUATION OF WORK SATISFACTION IN PRIMARY SCHOOl TEACHERS que deriva de la comparación entre las expectativas y la realidad percibida, ya sea que se refiera al proceso educativo o a los resultados finales, tal y como ocurre en el ámbito de los servicios de salud.2 Además de las expectativas intervienen valores morales, culturales, así como necesidades personales y circunstancias de la misma organización. Esto hace que la experiencia de satisfacción pueda ser diferente para distintas personas y para la misma persona en distintas circunstancias. En el extremo contrario se ubica la satisfacción del empleado. Es el conjunto de actitudes ante el trabajo, es decir, conjunta pensamientos y sentimientos. Locke la definió como el "estado emocional positivo o placentero de la percepción subjetiva de las experiencias laborales del sujeto". Depende de circunstancias del trabajo y características personales, necesidades, expectativas, el entorno cultural, etcétera. A su vez la satisfacción en el trabajo permite conocer el grado de motivación y compromiso que tienen los trabajadores hacia la institución y su trabajo cotidiano. También se ha relacionado con la salud física y psíquica 3 , y con la productividad. ABSTRACTThe objective was to evaluate job satisfaction in teachers at the entry level using the General Work Satisfaction Scale of Warr, Cook and Wall of 1979. This evaluation also gave the scale itself: its reliability and its internal correlation. Twenty-seven teachers were randomly selected and the instrument consisted of 15 items with a Likert-type response. Among the most notable results was the moderate level of job satisfaction they showed. Three higher items were identified, two of them estimators of extrinsic satisfaction. The reliability measurement was good for the instrument as a whole with a Cronbach's alpha of 0.879. The internal correlation between subscales was very good, 96%. It is concluded that, although the studied population did not show high satisfaction for work, the scale is suitable for use in teachers in our context.Keywords: SATISFACTION AT WORk, ORGANIZATIONAL CULTURE, TEACHERS. INTRODUCCIóNEl comportamiento de los trabajadores en el marco de su actividad laboral depende de múltiples factores. De acuerdo con Robbins 1 , las variables más estudiadas en este contexto son: compromiso con el trabajo, satisfacción laboral y compromiso organizacional. La satisfacción en el trabajo forma parte de la actitud general de un individuo hacia su empleo. Se relaciona directamente con la satisfacción del cliente o usuario que, por lo tanto, exige el compromiso del personal. Entonces es importante distinguir entre la satisfacción del usuario y la del trabajador. La primera es una experiencia cognoscitiva