Developmental delay in early childhood is associated with visual-constructive skills at school age in a Brazilian cohort
Psicologia: Reflexão e Crítica volume 29, Article number: 41 (2016)
We investigated differences in IQ and visual-constructive skills in school-age children evaluated as developmentally delayed or typically developed in early childhood. Sixty-four participants from a Brazilian cohort were evaluated in IQ (Wechsler Abbreviated Scale of Intelligence) and tasks of visual-spatial memory and visual-constructive skills through the Benton Visual Retention Test (BVRT) at school age. Neuropsychomotor development at 4 years of age was measured by Denver II. Developmentally delayed children showed lower IQs, lower scores, and more errors in copy and memory BVRT tasks when compared to typically developed children. Delay in neuropsychomotor development in early childhood may affect the subsequent cognitive development of children.
The nature of child development is essentially cumulative, and therefore, the first years of life are the basis for further development (Ali, 2013; Allen & Kelly, 2015). Child development is dynamic and involves the maturation of interrelated systems: cognitive, physical, and social-emotional skills (Casey et al. 2005). Early childhood is a time marked by rapid physical and neurological development and requires nutrition, stimulation, and appropriate health care for children to reach their full potential in terms of academic achievement and potential future earnings (Greenough & Black, 2013).
In general, children are referred to centers of treatment and diagnosis due to developmental delays, learning disabilities, or social interaction problems perceived by parents, teachers, or other professionals who follow the children into their routine. There are instruments to evaluate behavior and cognitive functioning in school-age children, including tasks with words and numbers, as at that age they are already able to understand language’s codes (Prelock et al. 2008). On the other hand, neuropsychomotor assessment is the main approach to evaluate cognitive functioning in early childhood, since those skills are developing faster in this phase, while the understanding of symbols is just starting (Theuer & Flores-Mendoza, 2003). The term “neuropsychomotor development” comprises motor skills, adaptation, socialization, and language (Dornelas et al. 2015; Le Boulch, 2001).
Neuropsychomotor development is crucial, since children develop language and other complex mental processes by the relationships they establish with the environment and active exploration through the manipulation of objects, the repetition of actions, and body self-control (Iverson, 2010; Levey & Polirstok, 2011). Progress in child development can be observed by the expression of initial motor acts and behaviors expected for each age getting successively more complex, according to the gradual maturation of the nervous system (Casey et al., 2005). Moreover, while children advance in independence and coordination, they become able to separately control each motor sequence and gradually coordinate these independent movements, making them more complex (Corso, 2007).
Throughout the development, fine motor skills merge with visual skills, allowing the assessment of problem solving based on visual-motor skills, an essential function of intellectual development (Accardo et al. 2008; Lipkin & Schertz, 2008). Visual-constructive skills require the coordination of fine motor skills with visual-spatial abilities and include not only the perception of objects and execution of movements but also planning and mental organization, essential capabilities to the development of more complex cognitive skills (Lanca et al. 2003).
Delayed neuropsychomotor development has a negative impact on children’s interactions in their environment, what may cause deficits in their performance of daily activities and further changes in the functioning of critical systems for learning, memory, and general reasoning (Hernandez & Caçola, 2015; Wendt et al. 1984). It was estimated that about 200 million children (up to 5 years old) across the world present delays in their development (Grantham-McGregor et al., 2007). In Brazil, it was reported that 3.3 % of the 3869 two-year-old children screened positive for suspected developmental delay (de Moura et al., 2010). Longitudinal studies have reported the relationship between neuropsychomotor delays and deficits on intelligence (Davis et al. 2007; Murray et al. 2007), language (Amaral et al. 2005), academic achievement (Taanila et al. 2005), and socioemotional skills (Bart et al. 2007). Individuals who have marked delays in reaching developmental milestones in early childhood periods are at higher risk for a subsequent diagnosis of learning disability or intellectual deficit (Murray et al., 2007; Murray et al., 2006; Taanila et al., 2005).
During early childhood, especially due to the sharp brain neuroplasticity, children’s experiences may have long-lasting effects on the development of mental processes (Greenough & Black, 2013; Skaliora, 2002). In this sense, it is important to investigate the cognitive processes since early childhood so that delays or difficulties can be predicted and effective interventions can be planned. Based on this assumption, this study compared the performance of children reported as developmentally delayed at 4 years old and typically developed children on IQ, visual-spatial memory, and visual-constructive skills at school age.
Participants were children who were recruited as a part of a larger birth cohort study on development in childhood. A detailed explanation of the objectives of the longitudinal study and the recruitment of participants can be found at Piccolo et al. (2012). The participant families belong to an area covering 18,000 people, approximately, and are assisted by three health units of the “Conceição Hospital Group” (Porto Alegre, RS, Brazil). Through the records of the births in that hospital from December 1998 to December 1999, the families were invited to participate in the study. All the families that have agreed to participate in that study were included. The longitudinal study had four data collection phases: at children’s 4 months of age (N = 146) and then when children were 2 (N = 126), 4 (N = 126), and 9/10 years old (N = 70).
For the present study, data were analyzed from a sample of 64 children (49.2 % male), participants for whom complete data were available on all variables assessed. At 4 years of age, children participating in this study were assigned as the developmentally delayed (DD) group (N = 39) or the typically developed (TD) group (N = 25) (Table 1) after neuropsychomotor assessment (Denver II). Table 1 shows the demographics of the sample, confirming that both groups showed equivalent sociodemographic characteristics. By the time of the visual-constructive skill evaluation, children’s age range from 9.7 to 11.8 years (M = 9.53 years, SD = 1.52). All participants were students from fourth to fifth grade from public schools, and their primary caregiver was their own mothers. The children were mostly from low socioeconomic status families, with average family income of about four minimum wages (M = 3.95, SD = 2.5; Table 1). In the interviews conducted by family therapists, families have reported that children have received no treatments since they were evaluated with Denver II.
When the children were 4 years old, family therapists conducted interviews with participating families and collected socioeconomic data (socioeconomic status index) (MARPLAN, 2008), family functioning (Global Assessment of Relational Functioning (GARF)), and maternal mental health (Self-Reporting Questionnaire (SRQ-20)) scales. The GARF scale (Cronbach’s alpha = .89; Falceto et al. 2000) evaluates whether the family meets the affective and operational needs of its members in a five-point Likert scale (1 = dysfunctional; 5 = satisfactory functioning). In addition, SRQ-20 (Mari & Williams, 1986) was used to evaluate maternal emotional and physical symptoms associated with psychiatric disorders (Cronbach’s alpha = .86). This scale consists of “yes or no” questions, and significant psychiatric morbidity is diagnosed when seven or more of the listed symptoms are reported.
The Denver II test (Drachler et al. 2007; Frankenburg et al. 1992) was used to evaluate the children’s neuropsychomotor development. This test was designed for evaluating children from birth to 6 years of age and consists of 125 items that assess the child’s socialization aspects within and outside the family environment; fine motor skills (eye/hand coordination, small object manipulation); gross motor skills (body motor control, sit, walk, jump); and language (sound production, ability to recognize, understand, and use the language). These items are recorded through direct observation of the children, and for some items, it is required to ask the mother if the children are able to perform a certain task or not. Taking into account the results of those evaluations, the examiner concluded if the child was typically developed or if he/she presents a developmental delay, comparing the child’s development to what is expected of his/her correspondent age. In this study, the 90th percentile of the Denver II test was the cutoff point to classify children as developmentally delayed, as recommended in the manual (Frankenburg et al., 1992).
At school age (9–10 years old), children were evaluated in IQ, visual-spatial memory, and visual-constructive skills and families answered the SRQ-20 and GARF again. After authorization from schools and parents/guardians (by signing the informed consent), the evaluation was performed with each child individually. There were two sessions (one for assessment of IQ and another for evaluation of other cognitive functions) with approximately 1 h each, in a school room prepared for testing. IQ was evaluated by composite of the Vocabulary and Matrix Reasoning subtests from the Wechsler Abbreviated Scale of Intelligence (WASI) (Trentini et al. 2014). This instrument was developed for use in individuals from 6 to 89 years old and consists of four subtests—Vocabulary, Cubes, Similarities, and Matrix Reasoning—that assess cognitive aspects, such as verbal knowledge, visual information processing, spatial and non-verbal reasoning, and fluid and crystallized intelligence (Yates et al., 2006). The WASI may be comprised of two or four subtests, with the two-subtest version (Vocabulary and Matrix Reasoning composite) yielding only a Full Scale IQ estimate (Groth-Marnat, 2009). Subtest raw scores are converted to T scores by way of tables in the manual. T scores can then be converted to either FSIQ-4 (all four subtests administered) or FSIQ-2 (only Vocabulary and Matrix Reasoning administered) standard scores, percentiles, and age equivalents.
The Brazilian version (Salles et al. 2016; Segabinazi et al., 2013) of the Benton Visual Retention Test (BVRT) was used to assess visual-constructive abilities (copy task) and visual-spatial memory (memory task). The A (memory) and the C (copy) administration forms were combined with the C and the D stimulus forms, respectively. For the memory task, each of the 10 slides was presented to the participants for 10 s, and immediately after that, the memory image was requested. For the copy task, children were asked to copy another 10 figures presented. The total execution time, total correct and error scores, and the types of errors (distortions, omissions, perseverations, rotations, and misplacements) for both copy and memory tasks were analyzed.
Sample characteristics such as age, education and socioeconomic status (SES), family functioning and maternal mental health at early childhood, and school age were analyzed using descriptive statistics and group comparison tests (chi-squared and ANOVAs, p < .05). Based on the Denver II scores (90 percentile), children were assigned to DD or TD. Then, the performance on IQ and BVRT tasks was compared between those groups. As the neurocognitive task variables did not show a normal distribution, we compared those outcomes using non-parametric tests (Mann-Whitney, p < .05). Finally, chi-squared tests were performed to compare the frequency of children who presented scores below the milestone for their age (p < .05). Statistical analyses were performed using SPSS 23 software.
IQ differences between groups
When analyzing the whole sample (N = 64), a significant difference in IQ scores between groups was observed. The DD group showed lower IQ scores compared to TD (F (1,62) = 6.018; p = .017; η 2 = .09). Taking into account that intellectual deficits could bias the interpretation of neuropsychological performance, children with IQ scores under 70 were removed (N = 8) from further comparative analysis between groups. All of them were from the DD group. The difference between groups for the socioeconomic variables remained statistically non-significant, and the IQ difference between DD and TD was not significant anymore.
Visual-spatial memory and visual-constructive skill differences between groups
There were significant differences between groups in both the BVRT copy and memory tasks (Table 2 and Fig. 1). Figure 1 illustrates the groups’ statistical significant differences in performance: DD were less accurate and made more errors as distortions and misplacements for both copy and memory tasks in relation to TD. In addition, significant differences between groups were observed in omissions, perseverations, and rotation for the BVRT memory task: DD committed more of those types of errors. Finally, it was observed that the DD were faster to execute the copy task but slower in performing the memory task when compared to TD (this last difference showed a very small effect size—see Table 2).
Classification according to BVRT normative milestones
Finally, it was observed that DD scores in both copy and memory tasks were more frequently classified under the milestone for their age (according to the BVRT normative milestones), when compared to the TD. In the copy task, 15.4 % of DD performed below the milestone in the correct scores and 20.5 % in the error scores, whereas 12 % of TD were below the milestone for both correct and error scores. The difference was not statistically significant for copy tasks, but it was significant for memory tasks: correct score difference X 2 (2, N = 56) = 4.24, p = .012, and error score difference X 2 (2, N = 56) = 4.41, p = .038. In the memory task, 15.4 % of DD have performed below the milestone for both correct and error scores, whereas no children from the TD group showed scores below that limit.
The findings from this study indicated that the neuropsychomotor development delay perceived at 4 years of age was associated with IQ and the development of visual-spatial abilities later, at school age. The skills developed in early childhood seem to be fundamental to the further development of intellectual abilities in the following stages, such as school age (Leisman et al. 2015; Mecca et al. 2012). Standard neuropsychomotor development consists of progressively refined coordination of motor skills with visual-spatial abilities, specially through environmental exploration, improved planning and mental organization, and cognitive skills related to the development of higher-order cognitive skills, such as memory and executive functions, later in life (Lanca et al. 2003). In terms of visual memory, it seems that there is a dynamic interaction between cognitive function and visual perception and visual-spatial skills during development. Studies with visual-agnostic children suggested that deficits in visual-spatial skills may have an effect on visual memory performance (Metitieri et al. 2013). In this study, it is possible that children from the developmentally delayed group have more difficulties in performing a visual memory task given their deficit in basic motor and perceptual skills early in childhood.
It is important to point out that the whole sample is essentially from low socioeconomic status families. Previous publications with this longitudinal data reported that socioeconomic conditions and maternal mental health were associated with language (Piccolo et al., 2012), memory and executive function performance, and stress (Piccolo et al. 2016). Studies have reported that environmental—such as socioeconomic status, home language environment, parental style, parental mental health—and biological factors—cortisol and neurotransmitter levels, for example—may influence the typical sequence of child development, affecting cognitive abilities (Brito & Noble, 2014; Johnson et al. 2016; Noble et al., 2015). The stimulation of sensorimotor abilities in the first years of life seems to be crucial for the development of subsequent cognitive skills (Hernandez & Caçola, 2015; Tierney & Nelson, 2009). Several factors may have an effect in cognitive development, such as low birth weight; respiratory, neurological, and cardiovascular disorders; neonatal infections; malnutrition; low socioeconomic status; and prematurity, for example (Avants et al., 2015; Greenough & Black, 2013; Handal et al. 2007). The more negative factors in the children’s life, the more likely the damages in their development (Evans & Fuller-Rowell, 2013).
The first years of life are the period of greater brain plasticity (Markham & Greenough, 2004; Wachs et al. 2014), and the activities carried out in this phase support the integration between the different sensory sources, facilitating the emergence of adaptive responses to different situations, which forms the basis for the acquisition of mental and social skills (Leisman et al., 2015). Children living in deprived environments are more susceptible to adverse environmental conditions such as toxins, chronic malnutrition, nutrient deficiency, and lack of stimulation, leading to a higher risk of neurological and behavioral disorders, such as learning disabilities and intellectual deficit later in life (Handal et al., 2007; Johnson et al., 2016). Given that the groups assessed in this study were composed of children from low SES families, the socioeconomic factors may have limited sensorimotor experiences in early childhood. It is hypothesized that these limitations in an extremely important period for child development, combined with limited access to materials and suitable conditions for the development of the child, could not be compensated for up to school age for this study’s sample. It has been pointed out also the need to deepen the study of environmental variables (Lipina & Segretin, 2015), as other factors such as language environment at home (Melvin et al., 2016), absence of a parent (McLanahan et al. 2013), or stress as a result of living in disadvantaged environments (Callaghan & Tottenham, 2016; Evans & Fuller-Rowell, 2013; Piccolo et al., 2016) may have short- and long-term effects in child development.
One can ask: if all children are from low SES environments, why do some of them have presented deficits but some of them have not? Some hypotheses were formulated to answer this question. First, there are genetic factors that may determine at least a significant amount of those cognitive skills and deficits (Krapohl et al., 2014), and it may vary from children to children. Then, there are other variables that can be involved such as distinct pedagogical practice approach from different schools (Bondy et al. 2007; Challen et al. 2014; Malti et al. 2011), parenting style (Karbach et al. 2013; Lugo-Gil & Tamis-LeMonda, 2008), and environmental nurturing (Avants et al., 2015; McEwen, 2012). Some mechanisms of resilience may underline these results as well (Chen et al., 2012; Hutz et al. 1996). Finally, all those hypothesized dimensions may be involved and impact on children development through a mechanism explored by social sciences called the “Matthew effect” or “accumulated advantage” (Mellard et al. 2012; Stanovich, 1986). According to this theory, individuals who have better developmental conditions develop better skills, which in turn improve their environment, creating a beneficial cumulative effect. On the other hand, those individuals from more disadvantaged environments who already present a deficit, specially a difficulty in the important dimension of functionality, may not be able to overcome these difficulties once the environment is not stimulating enough and the opportunities of better life conditions (such as high-quality schools and safe neighborhoods) are scarce, limited, or insufficient, creating a cycle of maladaptation that becomes harder to cope with.
Studies about the effect of early life experiences, its effects on development, and the mechanisms that underlie those associations still have a lot of questions to answer, and this research provides additional evidences in this sense. The strengths of this study include the analysis of a longitudinal sample, which allows inferring data on child development along different stages, although not causal relationships. In addition, this study contributes to the comprehension of how events that occur in the first years of life are essential for understanding the later development. Results from this study draw attention to the importance of early development evaluation to identify children with delays and start intervention as soon as those deficits are detected. The findings of this study have implications for intervention programs as well. First, it seems that the best strategy is to start the intervention early in childhood, as it was already reported in studies from social and economic sciences showing that early developmental delay prevention significantly reduces future costs in treatments (Belfield et al. 2006; Heckman, 2000; Reynolds et al. 2011). Second, it implies that interventions targeting children who grow up in disadvantaged environments may create opportunities for them to overcome those environmental limitations and achieve better cognitive outcomes.
It is important to mention that our findings can only indicate correlational association between the variables in those two different periods of children’s development. Although this study had a longitudinal design, we cannot infer casual effects of the variables from early childhood on the differences in visual-constructive skills later on at school age, since other variables (biological, behavioral, or socioeconomic) may contribute to the outcomes. Future studies aim to surpass some limitations of this work, expanding the sample size and investigating further factors of resilience and childhood development protection.
This study pointed out an important association between neuropsychomotor development at early childhood and children’s visual-constructive skills at school age. Those findings call attention to the importance of early evaluation of children’s development. Delays in child development trigger a complex and damaging cycle for the development of the child with such deficits. Consequently, it is necessary to evaluate and understand the cognitive processing in preschoolers in detail, taking into account family and school relationships, as well as its impact on the child’s adaptive functioning. Complete neuropsychological assessment enables early identification of children’s preserved and affected abilities. As a consequence, it is possible to delineate effective early interventions and likely help children reach better outcomes.
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LRP conceived the study, analyzed the data, participated in its design, and wrote the manuscript. JDS helped to analyze the data, participated in the design of the study, and helped to write the manuscript. OGF, CLCF, DRB, CMT, and CH participated in the study design and coordination and helped to write the manuscript. JFS conceived the study, participated in its design and coordination, and helped to write the manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Ethics approval and consent to participate
This study was approved by the Ethics Committee of the Hospital de Clínicas de Porto Alegre (number 08073/2008).
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Piccolo, L.d., Segabinazi, J.D., Falceto, O.G. et al. Developmental delay in early childhood is associated with visual-constructive skills at school age in a Brazilian cohort. Psicol. Refl. Crít. 29, 41 (2016). https://doi.org/10.1186/s41155-016-0048-2