Fig. 4: Cross-linguistic validation for the certainty task including the group of French speakers (N = 20), a group of native English speakers (N = 22), and a group of Spanish speakers (N = 21).

Normalized ratings (z-scored) were averaged separately for each prosodic archetype and language group. Data are presented as mean values with error bars showing the 95% confidence interval. Crosses represent individual data for each prosodic archetype and native language. As was the case in the group of French speakers, Spanish and English speakers perceived certain/honest archetypes to be more certain than doubt/lies archetypes (see main text for details). They also judged certain prosody to be more certain than honest prosodies (p < 0.005, N = 21 Spanish speakers: d = 0.4; N = 22 English speakers: d = 0.7) and lying prosodies to be more certain than doubtful prosodies (p < 0.001, Spanish: d = 0.7; English: d = 0.8), showing the same sensitivity to small variations in the gain of the archetypes. Source data are provided as a Source data file.