Acoustic correlates of anticipatory and progressive [ATR] harmony processes in Ethiopian Komo

Olejarczuk, Paul; Otero, Manuel A.; Baese‐Berk, Melissa M.

doi:10.1016/j.wocn.2019.01.004

Cited by 10 publications

(17 citation statements)

References 49 publications

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“…Often, after fitting a RF, researchers or practitioners want explore their “black-box” prediction machine. In many cases a more partial perspective on variable importance will be of interest, like for instance in the studies of [ 7 , 9 – 11 ]. The CPI provides this perspective.…”

Section: Discussionmentioning

confidence: 99%

“…Since its proposal, the CPI, which was implemented in the party package for the statistical software R [23], has become a popular variable importance measure in RFs. It has been applied in numerous studies across different research fields, from marine ecology [9] over neurology [7] and geography [10] to linguistics [11]. The broad use of the CPI illustrates its relevance and shows that there is an interest in RF-based importance measures with a more partial perspective.…”

Section: Variable Importance In Random Forestsmentioning

confidence: 99%

“…Many of the proposed measures have been empirically applied and have proven their practical value in a variety of different research fields. Some examples can be found in [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Conditional permutation importance revisited

2020

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Background: Random forest based variable importance measures have become popular tools for assessing the contributions of the predictor variables in a fitted random forest. In this article we reconsider a frequently used variable importance measure, the Conditional Permutation Importance (CPI). We argue and illustrate that the CPI corresponds to a more partial quantification of variable importance and suggest several improvements in its methodology and implementation that enhance its practical value. In addition, we introduce the threshold value in the CPI algorithm as a parameter that can make the CPI more partial or more marginal. Results: By means of extensive simulations, where the original version of the CPI is used as the reference, we examine the impact of the proposed methodological improvements. The simulation results show how the improved CPI methodology increases the interpretability and stability of the computations. In addition, the newly proposed implementation decreases the computation times drastically and is more widely applicable. The improved CPI algorithm is made freely available as an add-on package to the open-source software R. Conclusion: The proposed methodology and implementation of the CPI is computationally faster and leads to more stable results. It has a beneficial impact on practical research by making random forest analyses more interpretable.

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Section: Discussionmentioning

confidence: 99%

Section: Variable Importance In Random Forestsmentioning

confidence: 99%

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Conditional permutation importance revisited

2020

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“…Sound symbolism within one separate language is a real driving force. It is widely studied in the contexts of phonetics by such researchers as P.Olejarczuk and M.Baese-Berk [6] who study acoustic processes in the Komo language; T.Cho and G. Docherty devoting their research to exploring laryngeal contrast in 19 languages [7]. The problem of sound perception is touched upon in J.Caberelli's works [8].…”

Section: Methodsmentioning

confidence: 99%

Linguistic and Psychological Aspects of Universal Sound Symbolism Studies

Nikroshkina

2019

Proceedings of the Internation Conference on "Humanities and Social Sciences: Novations, Problems, Prospects" (HSSNPP 2019)

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The article deals with the problem of universality of sound symbolism. It aims to give a comprehensive account of theoretical and experimental research of iconicity within separate languages as well as cross-linguistic sound symbolism. The work provides results of psychological and psycholinguistic research into the phenomenon of sound symbolism. Keywords-universal sound symbolism, iconicity, psycholonguistic experiment, synesthesiaThere are numerous examples of sound symbolism in African languages: high-pitched words denote something small while low-pitched words stand for some large things in the Sudanese language. High-pitched sounds are also used to denote long distances and high speeds. Low-pitched sounds

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“…In most earlier studies on ATR, F1 and F2 were not normalised (with the exception of Olejarczuk et al 2019). We used an optimisation procedure based on Escudero et al (2009Escudero et al ( : 1382 which makes it possible to adapt the formant ceiling to the speaker and the vowel.…”

Section: Normalised Formant Values (F1 and F2)mentioning

confidence: 99%

Phonological and acoustic properties of ATR in the vowel system of Akebu (Kwa)

Makeeva,

Kuznetsova

2022

Phonology

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This study examines phonological and phonetic properties of ATR contrasts in the vowel system of Akebu (Kwa). The sum of descriptive evidence, including vowel harmony, vowel distribution in non-harmonising contexts, vowel reduction and typological and etymological considerations, indicates a rare vowel inventory with an ATR contrast in front/back vowels but a height contrast in the three redundantly [ $-$ ATR] central vowels /ᵻ, ə, a/. This analysis was checked against four common acoustic metrics of ATR: F1 and F2 frequencies, spectral slope and F1 bandwidth size (B1). As expected, the results for the last three metrics were variable across speakers and vowel types, and are therefore inconclusive. The results for F1 were consistent but do not distinguish between ATR and vowel height. Two results nonetheless suggest the [ $-$ ATR] status of central vowels: they occupy the same belt of F1 frequencies and show the same position of observed-over-predicted B1 values as front and back [ $-$ ATR] vowels.

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Acoustic correlates of anticipatory and progressive [ATR] harmony processes in Ethiopian Komo

Cited by 10 publications

References 49 publications

Conditional permutation importance revisited

Conditional permutation importance revisited

Linguistic and Psychological Aspects of Universal Sound Symbolism Studies

Phonological and acoustic properties of ATR in the vowel system of Akebu (Kwa)

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