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How are languages learned, and to what extent are learning mechanisms similar in infant native-language (L1) and adult second-language (L2) acquisition? In terms of vocabulary acquisition, we know from the infant literature that the ability to discriminate similar-sounding words at a particular age does not guarantee successful word-meaning mapping at that age (Stager &amp; Werker, 1997). However, it is unclear whether this difficulty arises from developmental limitations of young infants (e.g., poorer working memory) or whether it is an intrinsic part of the initial word learning, L1 and L2 alike. In this study, we show that adults of particular L1 backgrounds-just like young infants-have difficulty learning similar-sounding L2 words that they can nevertheless discriminate perceptually. This suggests that the early stages of word learning, whether L1 or L2, intrinsically involve difficulty in mapping similar-sounding words onto referents. We argue that this is due to an interaction between 2 main factors: (a) memory limitations that pose particular challenges for highly similar-sounding words, and (b) uncertainty regarding the language's phonetic categories, because the categories are being learned concurrently with words. Overall, our results show that vocabulary acquisition in infancy and adulthood shares more similarities than previously thought, thus supporting the existence of common learning mechanisms that operate throughout the life span. (PsycINFO Database Record

Difficulty in learning similar-sounding words: A developmental stage or a general property of learning?