985 resultados para linguistic attention control
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Visual attention depends on bottom-up sensory activation and top-down attentional guidance. Although aging is known to affect sensory processing, its impact on the top-down control of attention remains a matter of debate. We investigated age-related modulations of brain oscillatory activity during visual attention using a variant of the attention network test (ANT) in 20 young and 28 elderly adults. We examined the EEG oscillatory responses to warning and target signals, and explored the correlates of temporal and spatial orienting as well as conflict resolution at target presentation. Time-frequency analysis was performed between 4 and 30Hz, and the relationship between behavioral and brain oscillatory responses was analyzed. Whereas temporal cueing and conflict had similar reaction time effects in both age groups, spatial cueing was more beneficial to older than younger subjects. In the absence of cue, posterior alpha activation was drastically reduced in older adults, pointing to an age-related decline in anticipatory attention. Following both cues and targets, older adults displayed pronounced motor-related activation in the low beta frequency range at the expense of attention-related posterior alpha activation prominent in younger adults. These findings support the recruitment of alternative motor-related circuits in the elderly, in line with the dedifferentiation hypothesis. Furthermore, older adults showed reduced midparietal alpha inhibition induced by temporal orienting as well as decreased posterior alpha activation associated with both spatial orienting and conflict resolution. Altogether, the results are consistent with an overall reduction of task-related alpha activity in the elderly, and provide functional evidence that younger and older adults engage distinct brain circuits at different oscillatory frequencies during attentional functions.
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This study investigated the neural regions involved in blood pressure reactions to negative stimuli and their possible modulation by attention. Twenty-four healthy human subjects (11 females; age = 24.75 ± 2.49 years) participated in an affective perceptual load task that manipulated attention to negative/neutral distractor pictures. fMRI data were collected simultaneously with continuous recording of peripheral arterial blood pressure. A parametric modulation analysis examined the impact of attention and emotion on the relation between neural activation and blood pressure reactivity during the task. When attention was available for processing the distractor pictures, negative pictures resulted in behavioral interference, neural activation in brain regions previously related to emotion, a transient decrease of blood pressure, and a positive correlation between blood pressure response and activation in a network including prefrontal and parietal regions, the amygdala, caudate, and mid-brain. These effects were modulated by attention; behavioral and neural responses to highly negative distractor pictures (compared with neutral pictures) were smaller or diminished, as was the negative blood pressure response when the central task involved high perceptual load. Furthermore, comparing high and low load revealed enhanced activation in frontoparietal regions implicated in attention control. Our results fit theories emphasizing the role of attention in the control of behavioral and neural reactions to irrelevant emotional distracting information. Our findings furthermore extend the function of attention to the control of autonomous reactions associated with negative emotions by showing altered blood pressure reactions to emotional stimuli, the latter being of potential clinical relevance.
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The frontal eye field (FEF) is known to be involved in saccade generation and visual attention control. Studies applying covert attentional orienting paradigms have shown that the right FEF is involved in attentional shifts to both the left and the right hemifield. In the current study, we aimed at examining the effects of inhibitory continuous theta burst (cTBS) transcranial magnetic stimulation over the right FEF on overt attentional orienting, as measured by a free visual exploration paradigm. In forty-two healthy subjects, free visual exploration of naturalistic pictures was tested in three conditions: (1) after cTBS over the right FEF; (2) after cTBS over a control site (vertex); and, (3) without any stimulation. The results showed that cTBS over the right FEF-but not cTBS over the vertex-triggered significant changes in the spatial distribution of the cumulative fixation duration. Compared to the group without stimulation and the group with cTBS over the vertex, cTBS over the right FEF decreased cumulative fixation duration in the left and in the right peripheral regions, and increased cumulative fixation duration in the central region. The present study supports the view that the right FEF is involved in the bilateral control of not only covert, but also of overt, peripheral visual attention.
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INTRODUCTION: Handwriting is a modality of language production whose cerebral substrates remain poorly known although the existence of specific regions is postulated. The description of brain damaged patients with agraphia and, more recently, several neuroimaging studies suggest the involvement of different brain regions. However, results vary with the methodological choices made and may not always discriminate between "writing-specific" and motor or linguistic processes shared with other abilities. METHODS: We used the "Activation Likelihood Estimate" (ALE) meta-analytical method to identify the cerebral network of areas commonly activated during handwriting in 18 neuroimaging studies published in the literature. Included contrasts were also classified according to the control tasks used, whether non-specific motor/output-control or linguistic/input-control. These data were included in two secondary meta-analyses in order to reveal the functional role of the different areas of this network. RESULTS: An extensive, mainly left-hemisphere network of 12 cortical and sub-cortical areas was obtained; three of which were considered as primarily writing-specific (left superior frontal sulcus/middle frontal gyrus area, left intraparietal sulcus/superior parietal area, right cerebellum) while others related rather to non-specific motor (primary motor and sensorimotor cortex, supplementary motor area, thalamus and putamen) or linguistic processes (ventral premotor cortex, posterior/inferior temporal cortex). CONCLUSIONS: This meta-analysis provides a description of the cerebral network of handwriting as revealed by various types of neuroimaging experiments and confirms the crucial involvement of the left frontal and superior parietal regions. These findings provide new insights into cognitive processes involved in handwriting and their cerebral substrates.
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With incidence rates of osteoporosis increasing (Osteoporosis Canada, 2007), preventative efforts to minimize costs associated with condition diagnosis are a public health priority. Cues to action are specific internal (e.g., physical symptoms, family member with a condition) or external stimuli (e.g., public service announcements, health education campaigns) that are necessary to trigger appropriate health behaviours and serve to create an awareness of the health threat (Mattson, 1999). To date, limited understanding of the scope of influence cues to action have on health beliefs and behaviour associated with osteoporosis is known. The present investigation was designed to address this gap in the literature. More specifically, the influence of cues to action, a public service announcement (PSA) developed by Osteoporosis Canada and a bone screening by way of Quantitative Ultrasound, on health beliefs and health-enhancing physical activity (HEPA) across a four week period was investigated. Peri-and postmenopausal women (N= 174) were randomly assigned to one of three conditions 1) an osteoporosis public service announcement (PSA) condition; 2) a bone screening condition via quantitative ultrasound techniques, and 3) a PSA attention control condition. Health beliefs associated with osteoporosis were taken at three time points: prior to the cue to action intervention, immediately following the intervention, and four weeks post intervention. Knowledge of osteorporosis risk factors and HEP A were assessed pre and post-intervention only. Results of a regression analysis suggested that baseline health beliefs predicted baseline HEPA (R2 adj = .24; F (9, 161) = 6.49,p = .000; 95% CI = .12 - .35) with exercise barriers (p = -.33) being a negative predictor and health motivation (p = .21) being a positive predictor of HEP A. Baseline health beliefs predicted With incidence rates of osteoporosis increasing (Osteoporosis Canada, 2007), preventative efforts to minimize costs associated with condition diagnosis are a public health priority. Cues to action are specific internal (e.g., physical symptoms, family member with a condition) or external stimuli (e.g., public service announcements, health education campaigns) that are necessary to trigger appropriate health behaviours and serve to create an awareness of the health threat (Mattson, 1999). To date, limited understanding of the scope of influence cues to action have on health beliefs and behaviour associated with osteoporosis is known. The present investigation was designed to address this gap in the literature. More specifically, the influence of cues to action, a public service announcement (PSA) developed by Osteoporosis Canada and a bone screening by way of Quantitative Ultrasound, on health beliefs and health-enhancing physical activity (HEPA) across a four week period was investigated. Peri-and postmenopausal women (N= 174) were randomly assigned to one of three conditions 1) an osteoporosis public service announcement (PSA) condition; 2) a bone screening condition via quantitative ultrasound techniques, and 3) a PSA attention control condition. Health beliefs associated with osteoporosis were taken at three time points: prior to the cue to action intervention, immediately following the intervention, and four weeks post intervention. Knowledge of osteorporosis risk factors and HEP A were assessed pre and post-intervention only. Results of a regression analysis suggested that baseline health beliefs predicted baseline HEPA (R2 adj = .24; F (9, 161) = 6.49,p = .000; 95% CI = .12 - .35) with exercise barriers (p = -.33) being a negative predictor and health motivation (p = .21) being a positive predictor of HEP A. Baseline health beliefs predicted
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Recent research on the sources of cognitive competence in infancy and early childhood has highlighted the role of social and emotional factors (for example, Lewis, 1993b). Exploring the roots of competence requires a longitudinal and multivariate approach. To deal with the resulting complexity, potentially integrative theoretical constructs are required. One logical candidate is self-regulation. Three key developmental questions were the focus of this investigation. 1) Does infant self-regulation (attentional, emotional, and social) predict preschool cognitive competence? 2) Does infant self-regulation predict preschool self-regulation? 3) Does preschool self-regulation predict concurrent preschool cognitive competence? One hundred preschoolers (46 females, 54 males; mean age = 5 years, 11 months) who had participated at 9- and/ or 12-months of age in an object permanence task were recruited to participate in this longitudinal investigation. Each subject completed four scales of the WPPSI-R and two social cognitive tasks. Parents completed questionnaires about their preschoolers' regulatory behaviours (Achenbach's Child Behavior Checklist [1991] and selected items from Eisenberg et ale [1993] and Derryberry & Rothbart [1988]). Separate behavioural coding systems were developed to capture regulatory capabilities in infancy (from the object permanence task) and preschool (from the WPPSIR Block Design). Overall, correlational and multiple regression results offered strong affirmative answers to the three key questions (R's = .30 to .38), using the behavioural observations of self-regulation. Behavioural regulation at preschool substantially predicted parental reports of regulation, but the latter variables did not predict preschool competence. Infant selfregulation and preschool regulation made statistically independent contributions to competence, even though regulation at Time 1 and Time 2 ii were substantially related. The results are interpreted as supporting a developmental pathway in which well-regulated infants more readily acquire both expertise and more sophisticated regulatory skills. Future research should address the origins of these skills earlier in infancy, and the social contexts that generate them and support them during the intervening years.
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Among younger adults, the ability to willfully regulate negative affect, enabling effective responses to stressful experiences, engages regions of prefrontal cortex (PFC) and the amygdala. Because regions of PFC and the amygdala are known to influence the hypothalamic-pituitary-adrenal axis, here we test whether PFC and amygdala responses during emotion regulation predict the diurnal pattern of salivary cortisol secretion. We also test whether PFC and amygdala regions are engaged during emotion regulation in older (62- to 64-year-old) rather than younger individuals. We measured brain activity using functional magnetic resonance imaging as participants regulated (increased or decreased) their affective responses or attended to negative picture stimuli. We also collected saliva samples for 1 week at home for cortisol assay. Consistent with previous work in younger samples, increasing negative affect resulted in ventral lateral, dorsolateral, and dorsomedial regions of PFC and amygdala activation. In contrast to previous work, decreasing negative affect did not produce the predicted robust pattern of higher PFC and lower amygdala activation. Individuals demonstrating the predicted effect (decrease s attend in the amygdala), however, exhibited higher signal in ventromedial prefrontal cortex (VMPFC) for the same contrast. Furthermore, participants displaying higher VMPFC and lower amygdala signal when decreasing compared with the attention control condition evidenced steeper, more normative declines in cortisol over the course of the day. Individual differences yielded the predicted link between brain function while reducing negative affect in the laboratory and diurnal regulation of endocrine activity in the home environment.
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Bowen and colleagues’ methods and conclusions raise concerns.1 At best, the trial evaluates the variability in current practice. In no way is it a robust test of treatment. Two communication impairments (aphasia and dysarthria) were included. In the post-acute stage spontaneous recovery is highly unpredictable, and changes in the profile of impairment during this time are common.2 Both impairments manifest in different forms,3 which may be more or less responsive to treatment. A third kind of impairment, apraxia of speech, was not excluded but was not targeted in therapy. All three impairments can and do co-occur. Whether randomised controlled trial designs can effectively cope with such complex disorders has been discussed elsewhere.4 Treatment was defined within terms of current practice but was unconstrained. Therefore, the treatment group would have received a variety of therapeutic approaches and protocols, some of which may indeed be ineffective. Only 53% of the contact time with a speech and language therapist was direct (one to one), the rest was impairment based therapy. In contrast, all of the visitors’ time was direct contact, usually in conversation. In both groups, the frequency and length of contact time varied. We already know that the transfer from impairment based therapy to functional communication can be limited and varies across individuals.5 However, it is not possible to conclude from this trial that one to one impairment based therapy should be replaced. For that, a well defined impairment therapy protocol must be directly compared with a similarly well defined functional communication therapy, with an attention control.
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Aims: The aim was to examine whether specific skills required for cognitive behavioural therapy (CBT) could be taught using a computerised training paradigm with people who have intellectual disabilities (IDs). Training aimed to improve: a) ability to link pairs of situations and mediating beliefs to emotions, and b) ability to link pairs of situations and emotions to mediating beliefs. Method: Using a single-blind mixed experimental design, sixty-five participants with IDs were randomised to receive either computerised training or an attention-control condition. Cognitive mediation skills were assessed before and after training. Results: Participants who received training were significantly better at selecting appropriate emotions within situation beliefs pairs, controlling for baseline scores and IQ. Despite significant improvements in the ability of those who received training to correctly select intermediating beliefs for situation-feelings pairings, no between-group differences were observed at post-test. Conclusions: The findings indicated that computerised training led to a significant improvement in some aspects of cognitive mediation for people with IDs, but whether this has a positive effect upon outcome from therapy is yet to be established. (C) 2015 Elsevier Ltd. All rights reserved.
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Aims Training has been shown to improve the ability of people with intellectual disabilities (IDs) to perform some cognitive behavioural therapy (CBT) tasks. This study used a computerised training paradigm with the aim of improving the ability of people with IDs to: a) discriminate between behaviours, thoughts and feelings, and b) link situations, thoughts and feelings. Methods Fifty-five people with mild-to-moderate IDs were randomly assigned to a training or attention-control condition in a single-blind mixed experimental design. Computerised tasks assessed the participants’ skills in: (a) discriminating between behaviours, thoughts and feelings (separately and pooled together), and (b) cognitive mediation by selecting appropriate emotions as consequences to given thoughts, and appropriate thoughts as mediators of given emotions. Results Training significantly improved ability to discriminate between behaviours, thoughts and feelings pooled together, compared to the attention-control condition, even when controlling for baseline scores and IQ. Large within-group improvements in the ability to identify behaviours and feelings were observed for the training condition, but not the attention-control group. There were no significant between-group differences in ability to identify thoughts, or on cognitive mediation skills. Conclusions A single session of computerised training can improve the ability of people with IDs to understand and practise CBT tasks relating to behaviours and feelings. There is potential for computerised training to be used as a “primer” for CBT with people with IDs to improve engagement and outcomes, but further development on a specific computerised cognitive mediation task is needed.
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This study aimed to characterize and to compare the performance of students with an interdisciplinary diagnosis of dyslexia and attention deficit hyperactivity disorder (ADHD) in students with good academic performance on the reading processes. Sixty students from both genders, from 2nd to 4th grades of municipal public schools in Marília - SP participated in this study, they were distributed as follows: GI, 20 students with interdisciplinary diagnosis of dyslexia; GII, 20 students with ADHD and GIII, 20 students with good academic performance, paired according to gender, age and grade level with GI and GII. The students were submitted to the application of the assessment of reading processes (PROLEC) composed by four processes: letters identification, lexical, syntactical and semantic. The results highlighted that the students of GIII showed superior performance comparing with GI and GII. There was difference between GI and GII only in low frequency word reading and non words reading of the lexical process. The inferior performance from GI and GII in the PROLEC tests can be justified by the difficulty on the coding and decoding abilities. In ADHD students this difficulty was due to impaired interaction between the visual, linguistic, attention and auditory processing and in the dyslexic students was due to failure at the phonological mediation process, which depends on the knowledge of rules of grapheme - phoneme conversion to the acquisition of word reading. These changes affect the reading achievement and the comprehension of the read text.
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The objectives are as follows: To assess the efficacy of psychological interventions as an adjunct to standard surgical care compared to standard surgical care or attention control in adults undergoing open heart surgery.
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Esta tesis doctoral se inscribe dentro de la Traductología, interdisciplina que estudia tanto los procesos implicados en el complejo fenómeno de la traducción como los productos discursivos en la lengua hacia la cual se traduce. Su objetivo general consiste en contribuir a la investigación sobre el macroproceso de traducción en el par de lenguas francés/español, y en especial sobre la producción discursiva puesto que la literatura especializada coincide en destacar que ésta es la fase menos conocida [Lederer, 2005, 126; Toury, 2004, 244, 245]. Nuestro trabajo explora la producción discursiva, limitándola a traducciones absolutas [Gouadec, 1989: 21-30] de textos pragmáticos [Delisle, 1984: 22], cuya función esencial es el pasaje integral de la información. Dentro de dos corpora del campo de la Bioética constituidos por textos originales en francés y sus traducciones al castellano, hemos considerado como hipótesis general que los productos discursivos resultantes de la traducción absoluta de textos pragmáticos francés/castellano, presentan transferencias sintáctico-discursivas gobernadas por el universal de interferencia. Es decir que el planteo rector es que la memoria lingüístico-discursiva en la fase de reexpresión está atravesada por el mecanismo de interferencia. Las hipótesis específicas que se desgranan de la principal indican que la producción discursiva resultante de la traducción de textos pragmáticos francés/castellano exhibe enunciados elípticos anómalos gobernados por el universal de interferencia del discurso de partida [francés] o del sistema de la lengua materna del traductor [castellano]. Nuestra investigación parte entonces de la lectura del texto traducido [TT] y lo compara con el texto original [TO]; esta comparación es parcial puesto que indaga sobre las anomalías de producción; es indirecta pues observa la relación cohesión-coherencia-sentido en el discurso de llegada a través de las anomalías, especialmente de los enunciados elípticos; por último, analiza las anomalías dentro de la teoría de la interferencia y de la teoría de la elipsis [Toury, 2004: 121-124]. Sobre estas bases, hemos generado un instrumento que estudia los binomios textuales seleccionados según las siguientes aproximaciones: la sintaxis de la lengua meta [tipo de elipsis, elemento elidido, construcción de la elipsis, recuperabilidad]; la sintaxis del discurso meta [cohesión-coherencia], la comparación del binomio TT-TO [análisis de la producción del segmento problema en TO; el análisis de la producción del segmento solución en TT; posible extensión de las consecuencias de la anomalía microestructural; verificación del principio traducir toda la información]; los mecanismos de producción [elevación de la frecuencia de uso de recursos o elementos; control lingüístico de la lengua-cultura meta; control lingüístico-discursivo]; el resultado [visibilidad de interferencia; fenómeno sintáctico visible; alcance discursivo; producción palimpséstica; entropía informativa]. La elaboración de este andamiaje analítico aplicado a nuestros corpora nos ha permitido avanzar en el conocimiento de los mecanismos que participan en la producción discursiva en traducción y creemos que puede aplicarse, con las modificaciones de cada caso, para la descripción y quizás explicación de otros factores lingüístico-discursivos presentes en los textos traducidos
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Esta tesis doctoral se inscribe dentro de la Traductología, interdisciplina que estudia tanto los procesos implicados en el complejo fenómeno de la traducción como los productos discursivos en la lengua hacia la cual se traduce. Su objetivo general consiste en contribuir a la investigación sobre el macroproceso de traducción en el par de lenguas francés/español, y en especial sobre la producción discursiva puesto que la literatura especializada coincide en destacar que ésta es la fase menos conocida [Lederer, 2005, 126; Toury, 2004, 244, 245]. Nuestro trabajo explora la producción discursiva, limitándola a traducciones absolutas [Gouadec, 1989: 21-30] de textos pragmáticos [Delisle, 1984: 22], cuya función esencial es el pasaje integral de la información. Dentro de dos corpora del campo de la Bioética constituidos por textos originales en francés y sus traducciones al castellano, hemos considerado como hipótesis general que los productos discursivos resultantes de la traducción absoluta de textos pragmáticos francés/castellano, presentan transferencias sintáctico-discursivas gobernadas por el universal de interferencia. Es decir que el planteo rector es que la memoria lingüístico-discursiva en la fase de reexpresión está atravesada por el mecanismo de interferencia. Las hipótesis específicas que se desgranan de la principal indican que la producción discursiva resultante de la traducción de textos pragmáticos francés/castellano exhibe enunciados elípticos anómalos gobernados por el universal de interferencia del discurso de partida [francés] o del sistema de la lengua materna del traductor [castellano]. Nuestra investigación parte entonces de la lectura del texto traducido [TT] y lo compara con el texto original [TO]; esta comparación es parcial puesto que indaga sobre las anomalías de producción; es indirecta pues observa la relación cohesión-coherencia-sentido en el discurso de llegada a través de las anomalías, especialmente de los enunciados elípticos; por último, analiza las anomalías dentro de la teoría de la interferencia y de la teoría de la elipsis [Toury, 2004: 121-124]. Sobre estas bases, hemos generado un instrumento que estudia los binomios textuales seleccionados según las siguientes aproximaciones: la sintaxis de la lengua meta [tipo de elipsis, elemento elidido, construcción de la elipsis, recuperabilidad]; la sintaxis del discurso meta [cohesión-coherencia], la comparación del binomio TT-TO [análisis de la producción del segmento problema en TO; el análisis de la producción del segmento solución en TT; posible extensión de las consecuencias de la anomalía microestructural; verificación del principio traducir toda la información]; los mecanismos de producción [elevación de la frecuencia de uso de recursos o elementos; control lingüístico de la lengua-cultura meta; control lingüístico-discursivo]; el resultado [visibilidad de interferencia; fenómeno sintáctico visible; alcance discursivo; producción palimpséstica; entropía informativa]. La elaboración de este andamiaje analítico aplicado a nuestros corpora nos ha permitido avanzar en el conocimiento de los mecanismos que participan en la producción discursiva en traducción y creemos que puede aplicarse, con las modificaciones de cada caso, para la descripción y quizás explicación de otros factores lingüístico-discursivos presentes en los textos traducidos
Resumo:
Esta tesis doctoral se inscribe dentro de la Traductología, interdisciplina que estudia tanto los procesos implicados en el complejo fenómeno de la traducción como los productos discursivos en la lengua hacia la cual se traduce. Su objetivo general consiste en contribuir a la investigación sobre el macroproceso de traducción en el par de lenguas francés/español, y en especial sobre la producción discursiva puesto que la literatura especializada coincide en destacar que ésta es la fase menos conocida [Lederer, 2005, 126; Toury, 2004, 244, 245]. Nuestro trabajo explora la producción discursiva, limitándola a traducciones absolutas [Gouadec, 1989: 21-30] de textos pragmáticos [Delisle, 1984: 22], cuya función esencial es el pasaje integral de la información. Dentro de dos corpora del campo de la Bioética constituidos por textos originales en francés y sus traducciones al castellano, hemos considerado como hipótesis general que los productos discursivos resultantes de la traducción absoluta de textos pragmáticos francés/castellano, presentan transferencias sintáctico-discursivas gobernadas por el universal de interferencia. Es decir que el planteo rector es que la memoria lingüístico-discursiva en la fase de reexpresión está atravesada por el mecanismo de interferencia. Las hipótesis específicas que se desgranan de la principal indican que la producción discursiva resultante de la traducción de textos pragmáticos francés/castellano exhibe enunciados elípticos anómalos gobernados por el universal de interferencia del discurso de partida [francés] o del sistema de la lengua materna del traductor [castellano]. Nuestra investigación parte entonces de la lectura del texto traducido [TT] y lo compara con el texto original [TO]; esta comparación es parcial puesto que indaga sobre las anomalías de producción; es indirecta pues observa la relación cohesión-coherencia-sentido en el discurso de llegada a través de las anomalías, especialmente de los enunciados elípticos; por último, analiza las anomalías dentro de la teoría de la interferencia y de la teoría de la elipsis [Toury, 2004: 121-124]. Sobre estas bases, hemos generado un instrumento que estudia los binomios textuales seleccionados según las siguientes aproximaciones: la sintaxis de la lengua meta [tipo de elipsis, elemento elidido, construcción de la elipsis, recuperabilidad]; la sintaxis del discurso meta [cohesión-coherencia], la comparación del binomio TT-TO [análisis de la producción del segmento problema en TO; el análisis de la producción del segmento solución en TT; posible extensión de las consecuencias de la anomalía microestructural; verificación del principio traducir toda la información]; los mecanismos de producción [elevación de la frecuencia de uso de recursos o elementos; control lingüístico de la lengua-cultura meta; control lingüístico-discursivo]; el resultado [visibilidad de interferencia; fenómeno sintáctico visible; alcance discursivo; producción palimpséstica; entropía informativa]. La elaboración de este andamiaje analítico aplicado a nuestros corpora nos ha permitido avanzar en el conocimiento de los mecanismos que participan en la producción discursiva en traducción y creemos que puede aplicarse, con las modificaciones de cada caso, para la descripción y quizás explicación de otros factores lingüístico-discursivos presentes en los textos traducidos