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Most studies that have investigated the effects of instruction on the SLA of specific grammatical features have focused on intentional learning. This study investigated incidental acquisition by comparing the relative effects of two types of instruction—comprehension-based instruction (CBI) and production-based instruction (PBI)—on young Japanese learners’ incidental acquisition of English plural – s . Results showed that both the CBI and PBI groups performed significantly better than the control group on both the comprehension and production tests. There were no statistically significant differences between the two experimental groups. However, a comparison of those learners in the two groups who were complete beginners indicated an advantage for the CBI instruction. A quantitative and qualitative analysis of the interactions in one CBI and one PBI class showed that the students who received both kinds of instruction had ample exposure to plural – s nouns but that the nature of the corrective feedback they received differed. Whereas the feedback that the students in the CBI group received on their comprehension errors enabled them to distinguish the meanings of plural and singular nouns, the feedback that the students in the PBI group received on their production errors—in the form of recasts—did not result in the repair of errors.
Shintani et al. (Wed,) studied this question.