Article: Mother tongue, language of schooling and bilingual digit span.

It has been well established that digit span varies considerably across languages ranging from a high of 9.9 for Chinese (Hoosain, 1984) to a low of 5.7 for Arabic (Naveh-Benjamin & Ayres, 1986; see also Stigler, Lee & Stevenson, 1 986). This range of findings may be neatly accommodated by the phonological loop component of Baddeley's working memory model (e.g. 1990) which proposes that individual differences in both overt speech rate and phonological loop capacity determine memory span.

One of the phonological loop subsystems, the phonological store, holds speech-based material but is subject to a loss of information, due to decay, within approximately two seconds. ...

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