Multiple factors contribute to individual differences in reading ability. The two most thoroughly examined are socioeconomic status (SES) and phonological awareness (PA). Although these factors are often investigated individually, they are rarely considered together. Here we propose that SES systematically influences the relationship between PA and reading ability, and test this prediction in 150 first-graders of varying SES and PA. Results confirm a multiplicative relationship between SES and PA in decoding skills, such that decreased access to resources may amplify cognitive risk factors for poor decoding, whereas greater access to resources may buffer reading skills among children with weaker PA. Attempts to identify the cognitive and experiential factors driving development must acknowledge the complex, synergizing relations between these factors.
KeywordsCognition; Socioeconomic status; Phonological awareness; Reading; Language Many factors contribute to individual differences in early childhood reading ability. To optimize reading education strategies, we must understand how these factors relate to and interact with each other in the development of reading skills. Extensive literatures have addressed both the cognitive and social correlates of reading development. Sociological research has provided insights into the relationship between reading achievement and a child's socioeconomic background, whereas the traditions of cognitive and educational psychology have largely focused on the cognitive precursors to reading ability. However, although a number of studies have examined the distinct associations of either socioeconomic status (SES, e.g. R.H. Bradley, Corwyn, Burchinal, Pipes McAdoo, & Garcia Coll, 2001;White, 1982;Whitehurst, 1997) or phonological awareness (PA, e.g. Adams, 1990;L. Bradley & Bryant, 1983;Wagner & Torgesen, 1987) with reading development, surprisingly few have considered these two factors together (Bowey, 1995;Hecht, Burgess, Torgesen, Wagner, & Rashotte, 2000;Raz & Bryant, 1990), and none has examined how a child's social background may interact with PA in predicting reading ability. Such approaches implicitly make strong assumptions about the independence of these two factors. Here we hypothesize that these two factors are not independent, but rather, that a child's background and experiences are likely to directly interact with the cognitive precursors to reading. This "Multiplicative Factors
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NIH-PA Author ManuscriptHypothesis," outlined below, predicts that the relationship between PA and reading achievement will be systematically modulated by SES.SES is strongly associated with many measures of childhood cognitive and academic achievement, including IQ (Liaw & Brooks-Gunn, 1994;Smith, Brooks-Gunn, & Klebanov, 1997), achievement test scores (Brooks-Gunn, Guo, & Furstenberg, 1993), grade retentions and functional literacy (Baydar, Brooks-Gunn, & Furstenberg, 1993). These effects are typically quite substan...