1. Introduction

A recurring issue in the educational community is school failure (^{de Castro & Pereira, 2019}; ^{Fernández-Mellizo & Martínez-García, 2017}). The debate about the factors that likely underlie it is refueled every time PISA reports are published (^{Caro & Kyriakides, 2019}; ^{Davis, 2019}). However, the paradigm of the intellectual capacity of subjects being solely responsible for school achievement is overcome (^{Sternberg et al., 2010}). There is empirical evidence that other cognitive (executive functions), behavioral (motivation), and emotional (self-esteem) variables help to explain academic success (^{Cortés Pascual et al., 2019}; ^{Moyano et al., 2020}). Yet the dilemma comes into play if the predictive value of academic performance is higher in variables like functions, self-esteem, and motivation or intelligence, which play a fundamental role in its reasoning and verbal fluency variants (^{Best et al., 2011}; ^{Birkeland et al., 2012}; ^{Mercader et al., 2017}). In addition, there is concern about the role that achievements in the first years of regulated education implies for the results obtained at 15 years old of age, an age usually reflected in PISA reports, and the relevance of the different variables for these results when academic performance is understood as the product of the learning process (^{Lamas, 2015}). Nor should we forget the need for integrative models and mediational analyses that better specify the role of different variables.

Accordingly, apart from executive functions, understood as neurocognitive processes that control thoughts and regulate both behavior and cognitive and emotional activity (^{Zelazo & Carlson, 2012}), being a direct predictor, they present a mediating capacity in aspects like cognitive abilities (reasoning, verbal fluency), motor skills or physical fitness (^{Aadland et al., 2017}; ^{Bruijn et al., 2018}; ^{Bryce et al., 2015}). The different studies that have addressed the relation between executive functions and academic performance point out that it is established from the age of 3 (^{Mulder et al., 2017}), and it remains significant and moderate until the age of 12 (^{Jacobson et al., 2011}). However, the term executive functions is not free of controversy as different authors treat it as an unifactorial component and a predictor of general performance (^{Wiebe et al., 2008}), while other authors find a multifactorial composition capable of predicting specific performances (^{St. Clair-Thompson & Gathercole, 2006}).

The same occurs with variables like self-esteem, understood as the appreciation that we all have of ourselves, that is, an evaluative dimension of our own selfconcept (CidSillero2020), as a predictor of performance in Mathematics through the mediation of reasoning and motivation, which, in turn, are mediated by verbal fluency when predicting performance in Spanish Language and Literature (^{Moyano et al., 2020}). Self-esteem plays a motivational function, as pointed out by ^{Harter and Whitesell (2003)}, and has been studied as a mediator between variables and academic performance, especially as far as motivation and social factors are concerned when it comes to adolescent populations (CidSillero2020; ^{Kaplan et al., 1994}; ^{Masselink et al., 2018}).

Currently, the research lines that analyze predictors of academic performance focus on cognitive factors like executive functions or intelligence (^{Colom et al., 2006}). In this last variable, reasoning skills and verbal fluency are useful for explaining academic performance (^{Floyd et al., 2008}). Some studies, such as those by ^{Nascimento and Peixoto (2012)}, point out that the perception of possessing these cognitive skills helps to achieve academic success and to improve self-esteem. Along the same lines, ^{Evans (2003)} points out that significant relations appear between reasoning ability and the development of verbal fluency and high self-esteem. However, this relation sometimes requires the mediation of other variables (^{Nie et al., 2017}).

In response to all these questions, the present work aims to investigate the relation and predictive value that cognitive (reasoning, verbal fluency, and executive functions) behavioral (motivation), and emotional (selfesteem) variables have for the academic performance of pupils aged 6-9 years old, as well as the mediating role of some of them. The set objectives focus on studying possible predictive models in academic performance and the action of different psychological variables for pupils aged 6-9 years, and also on analyzing the interaction between interdependent variables and their mediating action in alternative predictive models. Therefore, the following hypotheses are posed:

2. Method

3. Results

First a descriptive and correlational analysis was carried out with academic performance, reasoning, verbal fluency, motivation, self-esteem, and executive functions. Academic performance correlated positively and significantly with all the independent variables, especially with reasoning (r = .602; p < .01), as it can be seen in Table 1. However, the variables of reasoning, verbal fluency, and executive functions (all of a cognitive nature) did not correlate with one another, but the behavioral and emotional variables of motivation and self-esteem did (r = .321; p < .01). Instead, reasoning correlated with self-esteem (r = .217; p < .05), and executive functions correlated with self-esteem (r = .254; p < .01) and motivation (r = .237; p < .05).

A second statistical analysis was carried out through regression models in which all the studied variables were included to assess their predictive power on academic performance (Table 2). The successive steps method was applied, which included the reasoning variables (β = .479, p < .001), executive functions (β = .258, p < .001), verbal fluency (β = .234, p < .001), and self-esteem (β = .214, p < .001). Only motivation was left out of the model because it was not significant. This model explained 55.4% of variance. Therefore, an increase in reasoning ability, verbal fluency, and a good development of executive functions and self-esteem would improve academic performance.

Next, we analyzed the direct and indirect interactions between the independent variables of the predictive model, and even the excluded variable (motivation), in its relation with academic performance to know if there was any mediating action. Self-esteem emerged as a mediator for the cognitive factors, such as reasoning and executive functions, but also for motivation (Figure 1). The mediation of self-esteem between reasoning and academic performance explained 45.2% of variance. In addition, when self-esteem mediated the relation between executive functions and academic performance, it explained 26.5% of variance. The mediation of self-esteem on motivation predicted 19.8% of variance for academic performance. Therefore, the students with high values for reasoning, executive functions, and motivation would have higher self-esteem values which would, in turn, imply better overall grades.

The second mediating variable was executive functions, which acted on the relation between motivation and self-esteem (Figure 2). This mediation model, between motivation and academic performance, explained 18.8% of the academic results, and, between self-esteem and academic performance, 26.5%. Thus, the students with higher self-esteem and motivation would obtain better results in the evaluation tests of executive functions, which would, in turn, imply obtaining better academic results. Therefore, despite the fact that executive functions were good mediators between the behavioral and emotional variables and academic performance, the strongest mediational effect was self-esteem.

4. Discussion

The objective of this study was to investigate the relation, the predictive value, and the mediating effect among the cognitive (reasoning, verbal fluency, and executive functions), behavioral (motivation), and emotional (self-esteem) variables on Primary Education pupils’ (69 years old) academic performance. Our findings indicate that this relation was powerful with reasoning (r = .602; p < .01), although self-esteem also had a strong impact (r = .426; p < .01). Therefore, together with an intelligence-related factor like reasoning, self-esteem, as an emotional variable, is capable of explaining academic results (CidSillero2020; ^{Bryce et al., 2015}). Both reasoning and the verbal component are considered the basis for good school achievement (^{Schneider & McGrew, 2012}), but the results of this study are not consistent because verbal fluency ranks fourth for academic performance. Moreover, self-esteem, emerging in reference to learning, is linked with attention, motivation to learn, and behavioral regulation (^{Rhoades et al., 2011}). Hence, the self-esteem of those students who do not feel very effective is low and their school performance is poor, while better self-esteem is related to academic success (^{Birkeland et al., 2012}; ^{Greene & Way, 2005}). These results suggest that reasoning, verbal fluency, executive functions, motivation, and self-esteem contribute to academic performance. Therefore, the first hypothesis of this study is fulfilled by obtaining a significant relation between all the independent variables and academic performance.

The model that comprises reasoning, executive functions, and verbal fluency predicts 51% of the variance for academic performance. However, this model’s effectiveness increases when the self-esteem variable is added, predicting 54% of school performance. Although school success was traditionally explained by subjects’ cognitive capacity or intelligence, together with reasoning and verbal fluency, executive functions appear, which are equally placed with intelligence for its predictive power of academic performance (^{Ren et al., 2015}; ^{Willoughby et al., 2010}). In addition, executive function contributes to students’ use of cognitive skills (^{Bryce et al., 2015}). The results of this research show that our second hypothesis is partially fulfilled because, although reasoning, verbal fluency, and executive functions are considered cognitive-type variables, and they represent most of the predictive model, there is a clear differentiation in them being manifested in no relation existing among these three variables, despite the fact that together they predict more than 50% of school performance. Along these lines, ^{Gioia et al. (2017)} pointed out that executive functions should not be studied only from a cognitive perspective, as their composition includes behavioral and emotional factors, which it was suggested by the results herein obtained. One example of this lies in how important self-esteem is in the predictor model.

Note: ∗∗∗p < .001;∗∗ p < .01;∗ p < .05

Figure 1 Mediation Models: Self-esteem as a Mediating Variable. 

Note: ∗∗∗p < .001;∗∗ p < .01;∗ p < .05

Figure 2 Mediation Models: Executive Functions as a Mediating Variable 

On the mediating role of self-esteem and executive functions, previous research confirms our results, because self-esteem has a direct effect on reasoning, executive functions, and motivation with academic performance, and executive functions do so on motivation and self-esteem. Cognitive reasoning ability allows problem solving and obtaining desired success, which facilitate the development of healthy self-esteem (^{Nascimento & Peixoto, 2012}), but self-esteem also reinforces reasoning ability (^{Evans, 2003}; ^{McArthur et al., 2016}). The relation with verbal fluency does not seem so clear as the intervention of other variables is necessary (^{Moyano et al., 2020}; ^{Nie et al., 2017}). The mediating effect of self-esteem on executive functions is indicated in the research by ^{Gioia et al. (2017)}, who pointed out that behavioral, emotional, and social aspects also appear in the development of executive functions. Regarding the mediating effect of self-esteem between motivation and academic performance, their interrelation is indicated insofar as students with good performance perceive their self-esteem to increase and feel, in turn, increasingly motivated to perform their academic tasks (^{Kaplan et al., 1994}; ^{Masselink et al., 2018}; ^{Regueiro et al., 2015}). It should not be forgotten that both motivation and selfesteem have a social component that might vary depending on the context in which they are found (^{Kiviruusu et al., 2016}). The scientific literature has also attributed a mediational character to executive functions in relation to academic performance, but has pointed it out for variables like cognitive skills, motor skills or physical fitness (^{Aadland et al., 2017}; ^{Bruijn et al., 2018}; ^{Bryce et al., 2015}). Therefore, our third hypothesis is not fulfilled because the variable with the strongest mediational effect is self-esteem, and not executive functions.

In conclusion, this study shows how academic performance depends on variables that are cognitive, motivational, and emotional in nature. This leads to a mixed predictive model and, in turn, highlights the mediating role of self-esteem among reasoning, executive functions, and motivation with academic performance. In relation to the analyzed multifactorial constructions and, despite the relevance that cognitive variables have traditionally had on learning and academic performance, they are not the only ones capable of building an effective predictive model. In fact, as this work shows, cognitive factors can become more effective through emotional factors like self-esteem, which, in turn, is improved by other variables like executive functions. A feedback relation is established and, therefore, one of flexibility and counter-balance, by emphasizing both types of factors as being malleable and, hence, not static. One of our research contributions, compared to the many studies that have focused on adolescence or on late childhood, is that it centers on younger ages (6-9 years). This age group undergoes neurocognitive maturation and psychosocial development, which are important for someone’s integral development. However, the results may be biased because this study is cross-sectional and includes a convenience sample that should be increased.

5. Conclusions and Limitations

This leads to important implications for the theoretical and practical field, such as the need to develop specific educational plans to improve motivation and self-esteem in Primary Education pupils, and the essential evaluation and monitoring of cognitive factors like reasoning, verbal fluency, and executive functions for their importance in academic performance at early ages (^{Cortés Pascual et al., 2019}). Although the presented predictive models well account for variance, it should be noted that other variables not dealt with in this document, such as teacher profile, learning styles or parental control, would help to explore more precisely the multidetermined nature of school performance, which is one of the limitations of our study. Therefore, future research should consider introducing socio-economic, family, and personality variables to complete the predictor model. It is also necessary to increase our studied sample size and to carry out a longitudinal design to generalize the obtained results to reach a higher level of involvement.