SES effects on the use of variation sets in child-directed speech.
Shira Tal, Inbal Arnon
PMID 29974833WHAT IT FOUND
High-SES mothers used more variation sets than lower-SES mothers in both English and Hebrew.
This means children from higher socioeconomic backgrounds heard more repetitions of phrases with slight variations, a structure linked to faster language learning.
Key findings
01High-SES mothers used a higher proportion of words and utterances within variation sets compared to lower-SES mothers in English.
02High-SES parents used a higher proportion of words and utterances within variation sets compared to mid-low SES parents in Hebrew.
03The study found no difference in the total number of words spoken or lexical diversity between SES groups, suggesting the difference lies in how speech is structured rather than its quantity.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study did not measure child language outcomes, so it cannot confirm that the observed SES differences in speech structure actually caused differences in language development in this sample. The interactions were short and somewhat unnatural (lab-based or home-based with an experimenter present), which may not reflect everyday speech patterns. SES is a proxy for many factors (stress, time, education), so the study cannot identify the specific cause of the difference in variation set use. The English sample size was small (16 children), and the Hebrew sample was also small (18 children).
The easy way to misread this
Do not assume that lower-SES parents provide 'poorer' input overall. The study found no difference in the total number of words or vocabulary diversity between groups. The difference was specifically in the structural organization of repetitions, which is just one aspect of high-quality input.