The procedural deficit hypothesis inspired a series of studies examining the non-linguistic procedural learning abilities of children with SLI, typically using a serial reaction time (SRT) paradigm(see Glossary) .Ameta analysis of eight studies using an SRTparadigm with children with SLI and age-matched controls revealed small but significant effects of language impairment on this task [5], of the order of 0.33 of a standard deviation. In studies with younger participants, larger effect sizes were found. In SLI, learning was impaired more when sequences were long and complex [6]. Similar problems with learning implicit sequences in the SRT task are also seen in younger typically developing children matched on grammatical ability, suggesting that implicit sequence learning in SLI maybe immature rather following anatypical developmental trajectory [7].