Labeling responses for adults (top panel) and 3-year-olds (bottom panel) to sibilant-vowel stimuli with synthetic sibilant noises, varying along an acoustic continuum, and natural vocalic portions. The symbol in parentheses indicates in which sibilant context the vocalic portion was produced. From “Age-Related Differences in Perceptual Effects in Formant Transitions Within Syllables and Across Syllable Boundaries,” by S. Nittrouer, 1992, Journal of Phonetics, 20, pp. 360–361. Copyright 1992 by Elsevier. Reprinted with permission.