Executive function (EF) underpins the ability to set goals and work towards those goals by co-ordinating thought and action. Its emergence during the first 3 years of life is understudied, largely due to the limitations that early social, motor and language skills place on performance on traditional EF tasks. Nevertheless, across the fields of cognitive psychology, neuroscience, social development and temperament research, evidence is amassing of meaningful precursors and predictors of EF. This review draws together the evidence, highlighting methodological considerations and areas of theoretical debate, and identifies 4 domains critical to the development of EF: control of attention, self-regulation, processing speed and cognitive flexibility. Individual differences within these domains have clinical significance both in terms of the identification of risk markers for later executive dysfunction and for the target or delivery of early intervention to ameliorate this risk. By the end of the third year, typically-developing infants are able to selectively employ impulse control and cognitive flexibility to achieve goal-directed responses to novel situations.
KeywordsExecutive function, cognitive development, infancy, regulation, attention, effortful control
EXECUTIVE FUNCTION IN THE FIRST 3 YEARS OF LIFE 3
What is Executive Function and Why is it Important?Executive function (EF) can be described as the cognitive toolkit of success. It underpins the ability to set goals and work towards those goals by co-ordinating thought and action, particularly in new situations. The precise nature of the 'tools' in the 'kit' is a matter of considerable debate, but they are largely considered to be higher-order self-regulatory processes, including the control of attention and motor responses, resistance to interference, and delay of gratification (Carlson, Mandell & Williams, 2004;Diamond, 2013;Jurado & Rosselli, 2007), or, as Barkley puts it "those self-directed actions needed to choose goals and to create, enact, and sustain actions toward those goals" (Barkley, 2012, p. 60).From its emergence in very early childhood through to its decline in late adulthood, EF supports and constrains an individual's ability to learn and thrive across their lifespan (Diamond, 2013). Not only does early EF have strong links to children's later social and academic functioning (Blair & Peters Razza, 2007; Eisenberg et al., 2009) but difficulties with some EFs are implicated in a range of disorders including Attention Deficit Hyperactivity Disorder (ADHD) and Autism Spectrum Disorder (ASD) (Barkley, 1997;Ozonoff, Pennington & Rogers, 1991;Rommelse, Geurts, Franke, Buitelaar & Hartman, 2011). However, currently executive dysfunction is primarily detected during a child's school years. By developing our understanding of the developmental pathway(s) involved in EF we may be able to monitor and intervene in cases where emergent EF is delayed or disrupted, whilst the brain is most responsive to treatment (Johnson, 2012;Wass, 2015).
Goals and ...