What makes a charismatic speaker? The present study extends this question into the prosodic dimension of voice quality. We analyzed various F0, LTAS and LTF long-term spectral characteristics from 12 L2 speakers of English who were recorded while giving entrepreneurial speeches. The results of the acoustic analysis were correlated with indirect judgments of the entrepreneurs' charismatic performances by 98 listeners. The correlations we found replicate previous findings in that a larger F0 range and a higher/lower F0 level are beneficial for a male/female speaker's perceived charisma. Moreover, LTAS settings that are indicative of a fuller and less breathy voice also led to higher speaker charisma ratings. The same applies to LTF settings that are indicative of a larger body or vocaltract size. The findings are discussed with respect to their implications for measuring and training charismatic speech, traditional rhetoric statements and the definition of charisma.

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This study reports on research stimulated by Lev-Ari and Keysar (2010) who showed that native listeners find statements delivered by foreign-accented speakers to be less true than those read by native speakers. Our objective was to replicate the study with non-native listeners to see whether this effect is also relevant in international communication contexts. The same set of statements from the original study was recorded by 6 native and 6 non-native speakers of English. 121 non-native listeners rated the truthfulness of the statements on a 7-point scale. The results of our study tentatively do confirm a negative bias against non-native speakers as perceived by non-native listeners, showing that subconscious attitudes to language varieties are also relevant in communication among non-native speakers.

The study investigates the impact of glottal elements before word-initial vowels on the speed of processing of the phrases taken from natural continuous speech. In many languages a word beginning with a vowel can be preceded by a glottal stop or a short period of creaky voice. However, languages differ in the extent of use and functions of this glottalization: it may be used to mark the word boundary, for instance, or to add special prominence to the word. The aim of the experiment was to find out whether the presence of the glottal element can influence reaction times in a word-monitoring paradigm. Users of different languages - Slovak and Czech learners of English, as well as native speakers of English - were participating in perception testing so that the influence of the mother tongue could be determined. The results confirm the effect of both glottalization and the L1 of the listeners. In addition, a significant effect of test item manipulations was found. Although the phrases with added or deleted glottal stops displayed no obvious acoustic artefacts, they produced longer reaction times than items with naturally present or absent glottalizations. We believe that this finding underlines the importance of inherent stress patterns, whose alterations lead to the increase in processing load.

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This study focuses on the production and perception of English words with a fortis vs. lenis obstruent in the syllable coda. The contrast is mostly cued by the duration of the preceding vowel, which is shorter before fortis than before lenis sounds in native speech. In the first experiment we analyzed the production of 10 Czech speakers of English and compared them to two native controls. The results showed that the Czech speakers did not sufficiently exploit duration to cue the identity of the word-final obstruent. In the second experiment we manipulated C and V durations in target words to transplant the native ratios onto the Czech-accented speech, enhancing the fortis–lenis contrast, and vice versa. 108 listeners took part in a word-monitoring task in which reaction times were measured. The hypothesized advantage to items in which the target word (with a fortis or lenis obstruent) was semantically congruent with the following context was not confirmed, and subsequent analyses showed that the words’ frequency of use and the collocations they enter into strongly affect speech processing and correlate to a large degree with the reaction times.

This paper contributes to the study of Czech-accented English by examining multiple pronunciation features, both segmental and prosodic, typically associated with or previously studied in Czech English. We analyzed ten female speakers who had been evaluated as having a strong accent in their English, using auditory and acoustic approaches. In the segmental domain, most of the analyzed speakers used Czech equivalents of the English open vowels /ae ɒ/ and tended to pronounce a velar plosive after a velar nasal. In the domain of connected speech, linking was very rare in our speakers, and their pitch range tended to be very flat. The results underscore the fact that the label "strong Czech accent" may, in different speakers, refer to different constellations of pronunciation features.

This study focuses on voicing assimilation across word boundaries in the speech of second language (L2) users. We compare native speakers of British English to speakers of two West Slavic languages, Czech and Slovak, which, despite their many similarities, differ with respect to voicing assimilation rules. Word-final voicing was analysed in 30 speakers, using the static value of voicing percentage and the voicing profile method. The results of linear mixed-effects modelling suggest an effect of first language (L1) transfer in all L2 English speaker groups, with the tendency to assimilate being correlated with the strength of foreign accent. Importantly, the two language groups differed in assimilation strategies before sonorant consonants, as a clear effect of L1-based phonetic influence.