This is evident in all vowels; our example compares the first formant (F1) location at .75 of the duration of the vowel/ae/ in hamlet and candle. Although there is no effect of word (hamlet,

candle) on F1 for the native speakers (both p > .19), the Spanish-accented speaker produces different F1s depending on the word, F(1, 38) = 8.9, p < .005, either because these sounds are coarticulated more in Spanish or because the slower Cisplatin concentration movements involved in the production of nonnative sounds affects coarticulation. In addition, findings from a listening experiment provided perceptual evidence that stimuli produced by Can and MidW are more similar as compared with MidW-Span.3 A repeated-measures ANOVA with average looking time as dependent measure, age group (younger, older), condition (kingdom/hamlet, candle/raptor), and order (American test, Canadian test) as factors, and familiarity (familiar,

unfamiliar) as repeated measures revealed a main effect of familiarity, F(1, 44) = 10.88, p = .002, main effect of order, F(1, 44) = 8.41, p = .005, significant interaction between age group and familiarity, F(1, 44) = 4.55, p = .04, and no other significant interactions, F(1, 44) < .18. Follow-up paired, find more two-tailed comparisons of looking time averaged across blocks revealed that familiar and unfamiliar trials differed significantly in the older age group, t(1, 23) = 3.77,

p = .001, but not in the younger group, t(1, 23) = 0.88, p = .39, as shown in Figure 3. The main effect of order emerges because both groups showed higher looking times when tested with the American speaker. As evidenced by the lack of interaction with order and familiarity, the pattern of looking remained the same in both the novel and familiar test trials, and only 12-month-olds showed a significant difference in looking time between passages containing familiar and novel Celecoxib words. These findings suggest that 12-month-olds successfully recognized words in the face of variation in dialectal accent, as evidenced by the significant preference for test passages containing familiar words. In contrast, 9-month-olds showed no preference, suggesting that dialectal differences were large enough to impede word recognition. This work extends the finding that infants are sensitive to dialect differences by showing the functional relevance of this sensitivity for word recognition in 9-month-olds. The 9-month-olds’ poor performance could be attributed to their lack of familiarity with dialectal accents, perhaps complicating the representation of words in unfamiliar speech streams.