Subjective SES is associated with children’s neurophysiological response to auditory oddballs
Phonological skills are important for language and reading acquisition. All three of these skills are associated across the lifespan with a child’s socioeconomic environment (i.e. SES). There are a large number of potential mechanisms that might explain SES associations with these processes. We explore one potential mechanism – that a child’s SES is associated with the discrimination of word-like sounds, i.e. phonological processing. Magnetoencephalography (MEG) data from a sample of 73 children, recorded during a passive auditory oddball task containing with word and non-word deviants, were used to test where and when any association may occur. We also investigate associations between cognition and attainment and this neurophysiological response. We identified evoked differences between word and non-word deviant tones at an early n200 component (likely representing early sensory processing) and later p300 component (likely representing attentional and/or semantic processing). Subjective SES was convincingly associated with later responses, but there were no significant associations with equivalised income. A child’s educational attainment was also significantly associated with the later component. This suggests that both the educational attainment of children, and their socioeconomic environment as rated by their parents, are significantly associated with underlying phonological detection skills, but likely at a later time-point, associated with semantic and attentional processes, rather than earlier sensory processing. Moreover, household income per se is not significantly associated with these skills.