Contribution Of Executive Functions Research Articles

The contributions of executive functions to decision-making in sport

ABSTRACT In sports, when the game situations become complex, untypical, and uncertain, making good decisions requires controlled processing, i.e., executive functions to regulate thought and action. The current study aimed at comprehending the effects of three core executive functions on decision-making in sport. In study 1, 86 volleyball players (49 experts and 37 novices) completed a routine blocking decision task as well as three core executive function tasks assessing updating, inhibition and shifting. Results showed that the effects of executive functions on blocking decision accuracy were moderated by sports level, with significant predictivity observed only for experts. In study 2, 32 expert players engaged in a dual-task version of the blocking decision task. In this study, only updating was correlated with decision accuracy. Study 3, involving 26 experts, introduced interference during the decision task. The findings highlighted a closer, albeit not statistically significant, relationship between decision accuracy and inhibition compared to updating. Collectively, these findings demonstrated the nuanced yet crucial roles of executive functions in decision-making in sport, underscoring more efficient cognitive processing among higher-level athletes and the different roles served by each executive function.

Indirect and direct contributions of executive functions to reading comprehension

In the current study, we investigated the role of executive functions in explaining how word recognition and language comprehension jointly predict reading comprehension in multilingual and monolingual students (Grades 1 and 2). Specifically, mediation and moderation models were tested and compared to offer a more nuanced understanding of the role of executive functions in reading comprehension. The results provided support for the mediation model in which executive functions indirectly contribute to reading comprehension via word recognition and language comprehension in both language groups. In addition, executive functions directly predicted reading comprehension (i.e., partial mediation). These findings suggest that executive functions serve as general cognitive processes that support word recognition, language comprehension, and reading comprehension (i.e., direct contribution) as well as facilitate connecting word recognition and language comprehension in support for reading comprehension (i.e., indirect contribution). These findings are consistent with prominent models of reading comprehension.

The contributions of executive functions, transcription skills and text-specific skills to text quality in narratives

AbstractTo ensure adequate writing support for children, a profound understanding of the subskills of text quality is essential. Writing theories have already helped to better understand the contribution of different subskills to text quality, but empirical work is often limited to more general low-level transcription skills like handwriting fluency and spelling. Skills that are particularly important for composing a functional text, while theoretically seen as important, are only studied in isolation. This study combines subskills at different hierarchical levels of composition. Executive functions, handwriting fluency and spelling were modeled together with text-specific skills (lexically diverse and appropriate word usage and cohesion), text length and text quality in secondary school students’ narratives. The results showed that executive functions, spelling and handwriting fluency had indirect effects on text quality, mediated by text-specific skills. Furthermore, the text-specific skills accounted for most of the explained variance in text quality over and above text length. Thus, it is clear from this study that, in addition to the frequently reported influence of transcription skills, it is text-specific skills that are most relevant for text quality.

The contributions of executive functioning to handwritten and keyboarded compositions in Year 2 children

Writing is a multifaceted skill, recruiting varied cognitive processes that involve working memory, attention shifting and inhibition, also known as executive functioning (EF). Despite emerging research examining associations between EF and handwritten composition, the mediating role of transcription skills on the relation between EF and text composition remains underexplored. Even less is understood about the nature of these potential mediation mechanisms in keyboard-based text composing, a writing modality that is becoming pervasive during the first years of schooling. This study investigated whether the automaticity of inscription skills (handwriting and keyboarding) and spelling mediate the relation between children’s EF and text composition across two modes (paper and keyboard-based text composing) on a sample of 544 Year 2 Australian children. Assessments of EF, inscription skills, spelling, and text composition were measured concurrently. Indirect pathways were tested via structural equation modelling. Findings indicated that across text composition modes, handwriting automaticity, keyboarding automaticity and spelling mediated the relationship between children’s EF and writing composition (i.e., compositional fluency and quality). The findings of this study extend current understanding of associations between cognitive processes and text composition in the junior years by examining keyboard-based text composing.

Domain‐general and reading‐specific cognitive flexibility and its relation with other executive functions: Contributions to science text reading comprehension

BackgroundCognitive and linguistic factors have been incorporated into models to explain reading comprehension beyond classical models of reading. This study explores the contribution of executive functions, mainly domain‐general and reading‐specific cognitive flexibility, in reading comprehension of science texts in monolingual Spanish speaking upper elementary students.MethodsA total of 275 Chilean students from fourth to sixth grade participated in this study. They were evaluated in working memory, inhibition, reading fluency, domain‐general and reading‐specific cognitive flexibility, academic vocabulary and science reading comprehension.ResultsThe results show that cognitive flexibility is a variable that explains performance in science reading comprehension across elementary grades. Furthermore, reading domain‐specific cognitive flexibility was found to be the variable that explains additional performance in science reading comprehension above inhibition, reading fluency, academic vocabulary and domain‐general cognitive flexibility in Grade 4 and Grade 5, but not in Grade 6.ConclusionsThese results suggest the contribution of cognitive variables such as cognitive flexibility in explaining performance in reading comprehension of science texts. The need to develop cognitive tests specific to reading domain is also discussed.

Neural correlates of intelligence: ERP Components of temporary storage predict fluid intelligence over and above those of executive functions.

Previous research has revealed that individuals with different levels of intelligence exhibit distinct patterns of event-related potentials (ERPs) related to executive functions and temporary storage. However, there is a lack of studies investigating the relative contributions of these ERPs in predicting individual differences in fluid intelligence. This study aims to examine the extent to which ERPs associated with executive functions and temporary storage can predict individual differences in fluid intelligence. Special attention is given to determining whether electrophysiological activities of temporary storage can predict fluid intelligence after accounting for executive functions, and vice versa. Both executive attention and temporary storage were measured by two experimental tasks, while electroencephalographic data were collected simultaneously. Fluid intelligence was assessed by two established tests. To address previous inconsistencies due to small sample sizes, a relatively large sample of young adults (N = 136) was recruited. The results revealed that participants with lower fluid intelligence displayed larger P3 amplitudes in the executive functions and temporary storage tasks compared to those with higher fluid intelligence. Additionally, the amplitudes of frontal and parietal P3s elicited by both executive functions and temporary storage significantly predicted fluid intelligence. Interestingly, the frontal and parietal P3s associated with temporary storage predicted fluid intelligence beyond the contributions of executive functions, supporting the storage account of individual differences in fluid intelligence. This study provides an original and fresh understanding of how executive functions and temporary storage contribute to fluid intelligence, offering new insights into the neurocognitive mechanisms underlying intelligence.

Executive functions and classroom behaviour in second graders

BackgroundExecutive functions along with on-task behaviour in the classroom relate to academic success. Examining the shared and non-shared variances in their relationships with academic achievement may lead to a better understanding of the contribution of executive functions to achievement and may uncover a mechanism to explain why they are so important for school success. Specifically, we investigated the extent to which executive functions and classroom behaviour offer different and similar perspectives on children’s self-regulatory behaviour, and make unique contributions to academic achievement.MethodData were collected from 129 2nd grade students (M age = 7.93 years, SD = 0.5; 44.2% female). Participants were observed for 25 min during a ‘business-as-usual’ classroom lesson, following a momentary assessment protocol; we developed and used an openly available mobile application. Subsequently, participants completed an executive function task (Hearts and Flowers) in small groups on tablet computers. Teachers rated students’ academic achievement in language and mathematics.ResultsWe found unique contributions for on-task behaviour and executive functions to academic achievement in 2nd grade. Moreover, we found that 27–31% of the total effect of inhibition on language achievement was mediated through on-task behaviour.ConclusionWe have shown that executive functions and on-task behaviour share variance in their relationship to academic achievement, as well as providing a unique perspective on children’s self-regulatory behaviour. Thus, researchers might want consider the inclusion of both executive function tasks and ecologically valid measures such as the current, easy to apply behavioural observation in a naturalistic setting in their future work.

The association of executive functions and physical fitness with cognitive-motor multitasking in a street crossing scenario

Age-related decline in cognitive-motor multitasking performance has been attributed to declines in executive functions and physical fitness (motor coordinative fitness and cardiovascular fitness). It has been suggested that those cognitive and physical resources strongly depend on lifestyle factors such as long-term regular physical activity and cognitive engagement. Although research suggests that there is covariation between components of executive functions and physical fitness, the interdependence between these components for cognitive-motor multitasking performance is not yet clear. The aim of the study was to examine the contribution and interrelationship between executive functions, motor coordinative fitness, and cardiovascular fitness on street crossing while multitasking. We used the more ecologically valid scenario to obtain results that might be directly transferable to daily life situation. Data from 50 healthy older adults (65–75 years, 17 females, recruited in two different cities in Germany) were analyzed. Participants’ executive functions (composite score including six tests), motor coordinative fitness (composite score including five tests), and cardiovascular fitness (spiroergometry), as well as their street crossing performance while multitasking were assessed. Street crossing was tested under single-task (crossing a two-line road), and multitask conditions (crossing a two-line road while typing numbers on a keypad as simulation of mobile phone use). Street crossing performance was assessed by use of cognitive outcomes (typing, crossing failures) and motor outcomes (stay time, crossing speed). Linear mixed-effects models showed beneficial main effects of executive functions for typing (p = 0.004) and crossing failures (p = 0.023), and a beneficial main effect of motor coordinative fitness for stay time (p = 0.043). Commonality analysis revealed that the proportion of variance commonly explained by executive functions, motor coordinative fitness, and cardiovascular fitness was small for all street crossing outcomes. For typing and crossing failures (cognitive outcomes), the results further showed a higher relative contribution of executive functions compared to motor coordinative fitness and cardiovascular fitness. For stay time (motor outcome), the results correspondingly revealed a higher relative contribution of motor coordinative fitness compared to executive functions and cardiovascular fitness. The findings suggest that during cognitive-motor multitasking in everyday life, task performance is determined by the components of executive functions and physical fitness related to the specific task demands. Since multitasking in everyday life includes cognitive and motor tasks, it seems to be important to maintain both executive functions and physical fitness for independent living up to old age.

Know thyself: Executive functioning and sex predict self-appraisal of functional abilities in community-dwelling older adults

Objective: The capacity for accurate self-appraisals of age-related changes in cognitive and functional abilities is integral to the maintenance of independence in later life, yet there is little understanding of the factors that place nondemented older adults at risk for poor self-awareness. This study examined the potential contributions of executive functioning (EF), crystallized intelligence (IQ-Cr), and sex in predicting congruence between performance and self-appraisals of instrumental activities of daily living (IADL) in a group of community-dwelling older adults. Method: A group of 150 nondemented, community-dwelling older adults (White and majority highly educated) completed measures of EF and IQ-Cr. Participants also completed five timed IADL tasks and self-appraised their performance relative to others of similar age. Results: Sex [F(1,148) = 7.75, p = .006, ηp 2 = .05] and EF [(F(1,147) = 5.30, p = .02, ηp 2 = .04)], but not IQ-Cr, predicted the relationship between performance and self-appraisals, such that those with lower EF and those of male sex overestimated their performance more than those with higher EF and females. Conclusions: Findings indicate that having average to below average EF abilities and being of male sex are risk factors for less accurate self-report of IADL abilities and as such might represent important considerations when assessing IADL abilities via self-report among largely independent, community-dwelling older adults.

Executive functions, motivation, and children's academic development in Côte d'Ivoire.

The role of executive function skills and motivation in supporting children's academic achievement is well-documented, but the vast majority of evidence is from high-income countries. Classrooms in sub-Saharan Africa tend to be large, teacher-driven, and lecture-focused, which may provide extra challenges for children to stay engaged in the learning process. Based in self-regulated learning theory, we tested the contributions of executive functions and motivation for children's literacy and numeracy skills over 1 school year. Our preregistered study of 2,500 primary school students in Côte d'Ivoire used lagged models with a robust set of demographic covariates. Executive functions were directly assessed, and children reported on their levels of motivation for schooling. Findings indicated strong longitudinal continuity of both literacy and numeracy skills over the academic year. Further, we found unique associations of executive functions and intrinsic motivation with changes in children's literacy skills and a unique association of executive functions, but not intrinsic motivation, with changes in children's numeracy skills over the school year. Overall, these results provide evidence for the importance of nonacademic skills for children's learning in a rural, sub-Saharan African context. Implications include improving access to preprimary education, the quality of primary school experiences, and teacher training and supports to increase children's early academic skills, self-regulation skills, and motivation for learning. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

The Roles of Arithmetic Fluency and Executive Functioning in Mathematical Problem-Solving

This study is conducted to further understand the direct and indirect contributions of executive functioning (visuospatial updating, verbal updating, inhibition, shifting) and arithmetic fluency to mathematical problem-solving in 458 fourth-grade students. Arithmetic fluency along with visuospatial and verbal updating were significant predictors of mathematical problem-solving at the end of grade 4. When the growth in mathematical problem-solving during grade 4 was analyzed, only arithmetic fluency directly and strongly contributed to students’ problem-solving at the end of grade 4. Inhibition and shifting (in combination with inhibition) were indirectly connected to mathematical problem-solving at the end of grade 4 via their arithmetic fluency. Arithmetic fluency plays a critical role and continues to do this in mathematical problem-solving. Furthermore, a decline in importance for visuospatial and verbal updating and increasing importance of inhibition and shifting (combined with inhibition) were found with regard to students’ ability to solve mathematical problems during grade 4.

The Relative Contribution of Executive Functions and Aging on Attentional Control During Road Crossing.

As we age, many physical, perceptual and cognitive abilities decline, which can critically impact our day-to-day lives. However, the decline of many abilities is concurrent; thus, it is challenging to disentangle the relative contributions of different abilities in the performance deterioration in realistic tasks, such as road crossing, with age. Research into road crossing has shown that aging and a decline in executive functioning (EFs) is associated with altered information sampling and less safe crossing decisions compared to younger adults. However, in these studies declines in age and EFs were confounded. Therefore, it is impossible to disentangle whether age-related declines in EFs impact on visual sampling and road-crossing performance, or whether visual exploration, and road-crossing performance, are impacted by aging independently of a decline in EFs. In this study, we recruited older adults with maintained EFs to isolate the impacts of aging independently of a decline EFs on road crossing abilities. We recorded eye movements of younger adults and older adults while they watched videos of road traffic and were asked to decide when they could cross the road. Overall, our results show that older adults with maintained EFs sample visual information and make similar road crossing decisions to younger adults. Our findings also reveal that both environmental constraints and EF abilities interact with aging to influence how the road-crossing task is performed. Our findings suggest that older pedestrians' safety, and independence in day-to-day life, can be improved through a limitation of scene complexity and a preservation of EF abilities.

Contributions of executive function to spatial thinking in young children

AbstractIdentifying factors that contribute to spatial thinking is of great interest given links between spatial thinking and success in Science, Technology, Engineering, and Mathematics (STEM) disciplines. Working memory has been found to be predictive of spatial thinking but little research has explored other components of executive function (i.e., inhibition and shifting) in relation to spatial thinking. A total of 131 4‐ to 6‐year‐olds (Mage = 5.06; 53.4% male; 56% Latinx, 18% White, 12% Mixed Race, 5% Asian, and 5% other) were assessed using spatial, executive function, and intelligence tasks. Results show that inhibition, shifting, and working memory are all associated with intrinsic and extrinsic spatial task scores. These results advance developmental theory on spatial thinking and offer a promising route for future interventions in improving spatial ability.Highlights In this study, we examine whether there are direct effects of executive function of children's spatial thinking. Four to six‐year‐old children were assessed using a battery of spatial, executive function, and general intelligence tasks. Results show that the three components of executive function are associated with both intrinsic and extrinsic spatial thinking. These findings advance developmental theory and provide a basis for future interventions to improve spatial thinking.

Executive functioning and divergent thinking predict creative problem-solving in young adults and elderlies

The role of executive functioning in creative thinking is under debate. Some authors suggested that increased inhibitory control, a component of executive functioning, is detrimental to creative solutions, whereas others argued that executive functions are central to creative problem-solving, thus questioning Guilford’s classical distinction between divergent and convergent thinking. Executive functions decline with age. In this study, we investigated the contributions of executive functioning and its age-related decline and divergent thinking to creative problem-solving. To this aim, we divided our sample of sixty healthy adults into two age groups of young adults (20–26 years) and elderly (60–70 years) and we assessed their creative problem-solving abilities (using the compound remote associate problems) as well as other potential cognitive predictors of creative problem-solving (i.e., impulsivity, divergent thinking, verbal working memory, and decision-making style). A linear regression model revealed that the ability to solve problems creatively is negatively predicted by older age and impulsivity, while positively predicted by divergent thinking and verbal working memory. These findings reveal a combined contribution of executive functions and divergent thinking to creative problem-solving, suggesting that both convergent and divergent processes should be considered in interventions to contrast age-related decline.

Cognitive underpinnings of COVID-19 vaccine hesitancy

RationaleVaccines save lives. Despite the undisputed value of vaccination, vaccine hesitancy continues to be a major global challenge, particularly throughout the COVID-19 global pandemic. Since vaccination decisions are counter-intuitive and cognitively demanding, we propose that vaccine hesitancy is associated with executive function—a group of high-level cognitive skills including attentional control, working memory, inhibition, self-regulation, cognitive flexibility, and strategic planning. ObjectiveWe set out to test (i) whether vaccine hesitancy is driven by individual differences in executive function beyond established socio-demographic factors (e.g., education, political orientation, gender, ethnicity, age, religiosity) and depressed mood, and (ii) whether this relationship is exacerbated by situational stress. MethodsTwo studies were conducted with U.S. residents. Using a cross-sectional design, Study 1 examined the associations between executive function, socio-demographic factors, COVID-19 conspiracy beliefs, trust in health authorities, and COVID-19 vaccine hesitancy. Using an experimental design, Study 2 focused solely on unvaccinated individuals and tested the interactive effect of executive function and stress on willingness to receive a COVID-19 vaccine. We used ordinal logistic regressions to analyze the data. ResultsIndividual differences in executive function predicted participants’ COVID-19 conspiracy beliefs, trust in health authorities, and their willingness to vaccinate against COVID-19. Importantly, the unique contribution of executive function to vaccine hesitancy could not be explained by socio-demographic factors or depressed mood. Furthermore, Study 2 revealed that weaker executive function had detrimental effects on COVID-19 vaccine acceptance and trust in health authorities mainly under heightened stress. ConclusionsIndividual differences in executive function and situational stress jointly impact COVID-19 vaccination decisions and need to be considered together when designing health communications aimed at reducing COVID-19 vaccine hesitancy. Interventions that lower stress and promote trust have the potential to increase vaccine acceptance, especially for individuals with weaker executive function.

Contributions of executive functions and linguistic skills to verbal fluency in children

ABSTRACT Despite the widespread use of verbal fluency (VF) tasks in child neuropsychological research and clinical practice, the contribution of executive and linguistic processes to variability in children’s fluency performance is still unclear. This is particularly important when considering the development of orthographic knowledge and semantic network during childhood. The present study investigated the contributions of executive functions and linguistic skills to performance in VF tasks in children. We examined the contributions of basic executive functions (i.e.,inhibitory control, working memory, and flexibility) and high-order executive functions (i.e., planning), vocabulary, lexical access speed, and phonological awareness to VF performance in 111 typically developing children (8–10 years old). Multiple regression analyses showed that phonological awareness was a predictor of performance in phonemic verbal fluency (PVF), and lexical access speed was the best predictor of performance in semantic verbal fluency (SVF). Among the executive function components, working memory was a predictor of performance in PVF and most categories of SVF (except animal fluency). In addition to working memory resources (i.e., a basic executive function), planning (i.e., a high-level executive function) was also recruited in the clothing category of SVF. These results highlight the importance of phonological processing skills in children’s performance on VF tasks and show similarities and differences in the contributions of various linguistic and executive skills to PVF and SVF. These findings have implications for interpreting the results of these measures in research and clinical practice.

Stroop performance is related to reading profiles in Hebrew-speaking individuals with dyslexia and typical readers.

There is a debate in the literature regarding the level of contribution of executive functions (EF) to reading comprehension (RC), in the context of the simple view of reading (SVR) model. The current study aims to create sub-profiles of reading and cognitive abilities based on a measure traditionally used for evaluating EF, that is, the Stroop task, and specifically, Stroop time. Ninety-seven adults with and without reading difficulties performed reading and cognitive tasks, including the Stroop tests. Four groups were created based on Stroop performance time and a reading profile was created for each group. A mediation analysis was conducted to determine if reading accuracy and linguistic abilities predict RC mediated by Stroop time. Participants with a shorter Stroop time demonstrated better reading abilities, whereas those with longer Stroop time showed decreased reading performance. Stroop time was also negatively associated with better performance in additional cognitive abilities. A mediation analysis suggested that decoding ability and linguistic ability predict RC through EF. Our findings support the SVR model and the involvement of EF in reading proficiency and might be used for designing EF-based interventions for reading and RC difficulties.

The Contribution of Executive Functions, Visual Processing and Reading Skills to the Performance in the Colored Raven Progressive Matrices Test: A Predictive Study among First-to-Fourth Grade Arabic-Speaking Children

In this study, the objective was to assess the extent to which EFs and visual processing, especially visual attention, contribute to children’s performance in the Colored Progressive Matrices of Raven (CPM), a test generally used between 5 - 11 years. For this purpose, we tested children from first grade to fourth grade in a battery that included the different sub-domains of EFs and visual processing tests. We hypothesized that links will be found between the performance in CPM, executive functions performance and visual/attentional processes. In addition, we hypothesized that EFs, in particular, working memory (WM) and shifting/updating, will explain variance in the performance in the CPM. At the same time, on the basis of findings showing a link between reading skills and performance in the RAVEN, we collected reading accuracy and fluency measures to assess the extent to which EFs and visual processing explain variance in the performance of RAVEN beyond reading accuracy. At the behavioral level, we found a grade effect in almost all the measures collected. Also, we found significant but still weak correlations between the performance in the CPM and almost all EFs, VP and reading measures (accuracy and fluency). The highest and most significant correlations were found between the CPM and Color Trail test (part B), which measures mental flexibility and shifting (r = .35) with reading accuracy (r = .38). Regression models conducted separately to assess the contribution of VP, EFs and reading showed first that VP explained 16% of the variance in the CPM, but only the Color Trail (Part A) was a significant predictor of the Raven’s scores. EFs explained 18% of the variance in the performance in the CPM, with Color Trail (Part B) measuring shifting being the strongest and significant predictor and then the Digit Span. Finally, a step-wise regression model showed that reading accuracy alone explained 15% of the variance in CPM, and with EFs and VP, additional 6% were provided (total 21%) by the Color Trail B. In spite of its limitations (the size of the sample groups), this study points to several new and important areas of inquiry for future research. For one, we noticed that not only does general ability correlate with reading, but reading, as a complex skill that includes many sub-skills, correlates with performance in non-verbal tests such as the CPM. In this regard, one can ask whether or not the school system should consider taking general ability and high-order thinking skills such as strategies and making connections into account as part of the pre-reading curriculum at early ages?

Когнитивные предикторы академической успешности: как общие закономерности «работают» на ранних этапах образования?

The article provides an overview of modern works devoted to the study of cognitive predictors of academic success. The general patterns of forecasting are revealed: the most powerful and universal predictor of academic success at different stages of school education is psychometric intelligence; creativity is less significant and rather unstable. It is argued that these patterns are poorly traced at the level of preschool education. Particular cognitive functions are significant for predicting the future educational achievements of preschoolers: information processing speed, visual perception (in combination with motor functions), short-term memory, and attention. Spatial abilities have a certain prognostic potential, though reasoning in preschoolers is not a strong predictor of academic success; executive functions have the greatest predictive power. It is noted that the general patterns in predicting the academic success of students can be traced in elementary school: the predictive potentials of psychometric intelligence are revealed, the power of individual cognitive abilities (in particular, spatial abilities) increases, the contribution of executive functions to the prediction decreases. The general tendency for non-cognitive factors (educational motivation, some personality traits) to increase with age also begins to appear in elementary school.

Modeling the influence of motor skills on literacy in third grade: Contributions of executive functions and handwriting.

Several nonlanguage factors influence literacy development, and motor skills are among those most studied. Despite the publication of several studies that have supported the existence of this relationship, the type of influence and underlying mechanisms have been little explored. Herein, we propose modeling the relationship between motor skills and literacy through structural equation modeling, testing the contribution of executive functions and handwriting skills as the possible mediators of this relationship. In a study of 278 third-grade children, we used a wide range of measures related to written language (reading, spelling, reading comprehension, and written production), fine motor skills (dominant hand, nondominant hand, and bimanual dexterity), executive functions (verbal and visuospatial working memory, inhibition, and shifting), and handwriting. Structural equation modeling of the relationship between these different variables indicated that in the third grade, the influence of fine motor skills on literacy is fully mediated by both executive functions and handwriting skills. These motor skills effects are observed for both low levels of processing (reading, spelling) and high levels of processing (reading comprehension, written production). The results are discussed in terms of the potential mechanisms underlying different literacy skills and their implications for pedagogical programs.