Phonics and Executive Functions in Reading Development
24 January 2024
A good education, particularly in reading, sets the foundation for later success. The challenge for schools is to provide a broad and rich curriculum that is ambitious, inclusive and accessible to all children, including the most disadvantaged. As researchers gain a deeper understanding of the human nervous system, brain networks such as the central executive network and its functions, such as working memory, cognitive flexibility and control of inhibition, we as educators are able to embrace innovative approaches with greater confidence, and bridge gaps in children’s development that need to be addressed.
Following the COVID pandemic and the current ‘cost of living crisis’, over a quarter of children are not reaching a good level of development by the age of five. Delays for example, in spoken language skills are likely to affect the development of executive functions such as emotional self-regulation, inhibitory control and sustained attention. Subtle or profound impairments in early reading skills and executive functions may have a cascading impact on educational success, well-being and good health.
If young children start to learn to read with limited skills in executive function, they may struggle to allocate the cognitive resources necessary for processing text, with slower or more effortful decoding, which would impact the development of new vocabulary and place increased demand on cognitive resources, setting up a negative spiral.
According to the so-called ‘Matthew Effect’ (Stanovich, 1986) ‘the rich get richer and the poor poorer,’ the children who fall behind in reading, continue to fall behind as they go through school. This spiralling effect has been described as a reciprocal relationship between the efficiency of decoding and the development of executive functions (Stanovich, 2009). Indeed, longitudinal studies have linked warm and responsive parenting with good levels of development in:
- executive functions such as sustained attention and emotional self-regulation,
- spoken language skills prior to starting pre-school,
- fluency and enjoyment in reading,
- later academic achievement.
Phonics and executive functions
The most obvious milestones of child development include learning to walk, run, jump and talk, but executive functions are relatively nuanced and reach maturity in early adulthood. They include the a child’s ability to regulate their emotions, sustain their attention, suppress their impulses and choose goal-directed rather than impulse-driven behaviour.
It is interesting to consider the relationship between executive functions and phonics because executive functions are generally regarded as ‘top down’ processes, whereas language is processed from the bottom up, primarily as a sensory experience, whether through speaking, reading or listening. However, in the context of decoding the words on the page, a child in the early stages of learning to read must tackle word reading as a code breaker would using various tools:
- phonological awareness,
- knowledge of the relationship between letters and sounds,
- visual memory of the shape of the word,
- cues provided by the context.
If we focus in on this problem-solving aspect of learning to read, we can see why ‘top down’ processes such as executive functions are so important. In this post, I’ll discuss the executive functions of working memory, cognitive flexibility and control of inhibition. However, the control of sustained attention, which is also considered an executive function, is a prerequisite for focused reading and learning (Diamond, 2013). If a child is hungry, tired or anxious, even in the most calm, orderly and consistent of learning environments, they are likely to struggle to focus their attention and their other executive functions: the development of learning and reading is therefore arrested for the most fundamental of reasons.
Phonics and working memory
Given that executive functions develop throughout childhood and adolescence, it is not surprising that researchers have found a general correspondence between the development of decoding ability and executive functions. Therefore, as children develop into fluent readers, they rely less on the problem-solving aspect of decoding and on maintaining the letters and their corresponding sounds in working memory while they decipher each of the syllables in turn. However, decades of research have provided evidence of an association between working memory and decoding skills for children with fragile reading.
A key difference between fragile and fluent readers has been explained by the Dual Route Model of visual word recognition and reading aloud (Coltheart, et al. 2001). According to this model, during the development of early reading, decoding skills require both a phonological processing route (for the smallest sounds of language) and an orthographic route (for the visual recognition of the whole word). Children with fragile reading tend to spend more time and effort in the phonological route, whereas children with fluent reading are able to recognise whole words without an emphasis on effortful and slower phonological processing. This learning difference is likely to cascade into all areas of learning, leaving the fragile reader struggling with fatigue in the long term, unless their reading becomes fluent.
Phonics and task-switching
‘Task-switching’ is also known as ‘cognitive flexibility’. Imagine a bi-lingual child who speaks a different language depending on the context. Perhaps they speak English at school and a different language at home. This ‘top down’ switch from one language to another is an example of the type of shift that children learn to make in many areas of everyday life.
The Dual Route Model offers a way to understand the role of ‘task-switching’ in reading development. Reading experts (Cartwright et al., 2017) have argued that fluent readers have the ability to toggle between phonological and whole word processing, whereas novice readers do not and the researchers attribute this flexible dimension of reading fluency to ‘task switching’. As we have already seen, the need to apply this level of flexibility and ‘top down’ control would decrease as reading fluency develops (Guajardo and Cartwright, 2016).
Phonics and control of inhibition
Inhibitory control plays an important role in children’s learning behaviour. It is obvious that some children are very distractible and chatty in class. Those who cannot focus their attention and suppress internal impulses at will are more likely to struggle with hearing the smallest units of language (phonemic awareness). A longitudinal study that tracked the reading development of children from kindergarten (age five) to second grade (seven years of age) demonstrated an indirect relationship between inhibitory control and phonological awareness (Van de Sande et al, 2017). Another study (Ober et al., 2019) focused on adolescents and demonstrated associations between their decoding ability, inhibitory control and task-switching, which underscores the need to remediate struggling readers as soon as they are identified.
A Meta-analysis
Although an association between executive unctions and reading comprehension has already been established, the relationship between executive functions and decoding skills requires a degree of clarification, partly because decoding skills and executive functions mature in tandem in typically developing children (Ober et al, 2020).
A meta-analysis was conducted by Ober and colleagues (2020). Across 65 studies, covering a wide range of languages there were 165 significant associations between decoding and executive function skills and the mean effect size was ‘moderate’ for both word reading and nonword reading. In a large sample, it is easier to achieve statistical significance, but far harder to achieve an effect size of this magnitude, which indicates the considerable strength of the relationship.
The meta-analysis showed that associations were significant and generated moderate effect sizes for the following executive functions:
- working memory and word reading (as well as nonword reading)
- task-switching with word reading (as well as nonword reading)
- inhibitory control with word reading (as well as nonword reading)
Characteristics of different languages
Languages such as English, French, Chinese or Arabic have relatively deep orthographies, which means that the relationship between the sounds of words and the way that they are written is multi-layered. This is because of the way the language developed over thousands of years. Languages such as Spanish and Greek are mainly regular in the relationship between the sounds of language and their appearance on the page.
As a consequence, in English, words such as, ‘said’ or ‘water’ are taught by visual recognition as they cannot be learned by relying on entirely the smallest sounds of language (phonemes) to lead the child to the correct spelling.
In 1969 a team of researchers (Berdiansky and colleagues) looked at the 6,092 most common one and two syllable words extracted from the schoolbooks of children aged between six and nine. They found that there were 211 symbol-to-sound correspondences and of these, 166 could be described as rule-based, whereas 45 were exceptions to these rules. A rule was established if it occurred at least ten times in the 6092 words.
In the meta-analysis the various languages were organised into two groups:
- Deep orthographies: Chinese, English, Danish, French
- More transparent orthographies: Croatian, Dutch, German, Greek, Spanish, Turkish
The researchers looked at the extent to which age interacted with the effect sizes in the studies. Interestingly, the effect of age on these data depended on which executive function was studied, with age as a predictor of performance on ‘task-switching’. Here, the association between decoding and task-switching became smaller as the age of participants increased.
Drilling down into the data, the researchers found that the longitudinal studies (which tracked children’s performance on working memory, task-switching and inhibitory control and decoding over time), showed that the strength of the relationship between executive function skills and decoding was more reliable in early rather than late childhood.
With respect to different types of language, those with deep orthographies were more likely to demand a more frequent toggling pattern between the phonological and the orthographic processing routes during reading development, but the need to toggle would diminish with age once reading fluency has been established.
However, for weaker readers who do not develop reading fluency, a language with a deep orthography such as English provides an additional challenge in terms of ongoing effortful phonological processing and falls into a spiral of diminishing returns, as increased effort leads to cognitive fatigue and a sense of disempowerment.
If you are interested in finding out more about how the Rhythm for Reading programme can help, click here.
If this topic is of interest, keep reading!
Supporting children with a ‘fuzzy’ awareness of phonemes and other symptoms consistent with dyslexia
If we turn to auditory problems faced by people with dyslexia, there are two interesting things to consider. One is fuzzy phonemes. Phonemes are the smallest sounds of language. If we break the sound wave of a phoneme down into its beginning, middle and end, this can help us to think about the very first part of the sound. Among children with dyslexia, there is a lack of perceptual clarity at the front edge of a phoneme.
When phonics and rhythm collide part 1
A child with sensitivity to rhythm is attuned to the onsets of the smallest sounds of language. In terms of rhythmic precision, the front edge of the sound is also the point at which the rhythmic boundary occurs. Children with a well-developed sensitivity to rhythm are also attuned to phonemes and are less likely to conflate the sounds.
When phonics and rhythm collide part 2
Vowel sounds carry interesting information such as emotion, or tone of voice. They are longer (in milliseconds) and without defined edges. Now imagine focussing on the onset of those syllables. The consonants are shorter (in milliseconds), more sharply defined and more distinctive, leaving plenty of headspace for cognitive control. If consonants are prioritised, information flows easily and the message lands with clarity.
Phonemes and syllables: How to teach a child to segment and blend words, when nothing seems to work
There is no doubt that the foundation of a good education, with reading at its core, sets children up for later success. The importance of phonics is enshrined in education policy in England and lies at the heart of teaching children to become confident, fluent readers. However, young children are not naturally predisposed to hearing the smallest sounds of language (phonemes). Rather, they process speech as syllables strung together as meaningful phrases.
REFERENCES:
Berdiansky, B., Cronnell, B. And Koehler, J. (1969) Spelling-sound relations and primary form-class descriptions for speech comprehension vocabularies of 6-9 year olds. Technical Report No 15. Los Alamantos. CA. Southwet Regional Laboratory for Educational Research and Development
Cartwright, K.B., Marshall, T.R., Dandy, K. L. and Isaac, M. C. (2017) Cognitive flexibility deficits in children with specific reading comprehension difficulties, Contemporary Educational Psychology, 50, 33-44
Coltheart, M.,Rastle, K., Perry, C., Langdon, R. And Ziegler, J. (2001) DRC: A dual route cascaded model of visual word recognition and reading aloud, Psychological Review, vol.108, no.1, pp. 204-56
Diamond, A. (2013) Executive functions. Annual Review of psychology, 64, 135-168
Guarjardo, N.R. and Cartwright, K.B. (2016) The contribution of theory of mind, counterfactual reasoning and executive function to pre-readers’ language comprehension and later reading awareness and comprehension in elementary school. Journal of Experimental Child psychology, 144, 27-45.
Ober, T.M., Brooks, P.J., Plass, J.L. & Homer, B.D. (2019) Distinguishing direct and indirect effects of executive functions on reading comprehension in adolescents. Reading psychology, 40 (6), 551-581.
Ober, T.M., Brooks, P.J., Homer, B.D. and Rindskopf, D. (2020) Executive functions and decoding in children and adolescents: A meta-analytic investigation, Educational Psychology Review,
Perfetti, C. (1985) Reading ability, Oxford: Oxford University Press
Perfetti, C. (2007) Reading ability: Lexical quality to comprehension. Scientific Studies of Reading, 20 (4) 325-338
Stanovich, K.E. (1986) Matthew effects in reading: Some consequences of individual differences in the acquisition of literacy. Reading Research Quarterly, 21 (4), pp.360-407
Van de Sande, E., Segers, E., & Verhoeven, L., (2017) how executive control predicts early reading development. Written Language and Literacy, 20 (2), 170-193
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