@article{SotiropoulouGafos2022, author = {Sotiropoulou, Stavroula and Gafos, Adamantios I.}, title = {Phonetic indices of syllabic organization in German stop-lateral clusters}, series = {Laboratory Phonology}, volume = {13}, journal = {Laboratory Phonology}, number = {1}, publisher = {Open Library of humanities}, address = {Cambridge}, issn = {1868-6346}, doi = {10.16995/labphon.6440}, pages = {42}, year = {2022}, abstract = {Using articulatory data from five German speakers, we study how segmental sequences under different syllabic organizations respond to perturbations of phonetic parameters in the segments that compose them. Target words contained stop-lateral sequences /bl, gl, kl, pl/ in word-initial and cross-word contexts and were embedded in carrier phrases with different prosodic boundaries, i.e., no phrase boundary versus an utterance phrase boundary preceded the target word in the case of word-initial clusters, or separated the consonants in the case of cross-word sequences. For word-initial cluster (CCV) onsets, we find that increasing C1 stop duration or the lag between two consonants leads to earlier vowel initiation and reduced local timing stability across CV, CCV. Furthermore, as the inter-consonantal lag increases, C2 duration decreases. In contrast, for cross-word C\#CV sequences, increasing inter-consonantal lag does not lead to earlier vowel initiation and robust local timing stability is maintained across CV, C\#CV. In other words, in CCV sequences within words, local perturbations to segments have effects that ripple through the rest of the sequence. Instead, in cross-word C\#CV sequences, local perturbations stay local. Overall, the findings indicate that the effects of phonetic perturbations on coordination patterns depend on the syllabic organization superimposed on these clusters.}, language = {en} } @article{LialiouSotiropoulouGafos2021, author = {Lialiou, Maria and Sotiropoulou, Stavroula and Gafos, Adamantios I.}, title = {Spatiotemporal coordination in word-medial stop-lateral and s-stop clusters of American English}, series = {Phonetica : international journal of phonetic science}, volume = {78}, journal = {Phonetica : international journal of phonetic science}, number = {5-6}, publisher = {De Gruyter Mouton}, address = {Berlin}, issn = {0031-8388}, doi = {10.1515/phon-2021-2010}, pages = {385 -- 433}, year = {2021}, abstract = {This paper is concerned with the relation between syllabic organization and intersegmental spatiotemporal coordination using Electromagnetic Articulometry recordings from seven speakers of American English (henceforth, English). Whereas previous work on English has focused on word-initial clusters (preceding a vowel whose identity was not systematically varied), the present work examined word-medial clusters /pl, kl, sp, sk/ in the context of three different vowel heights (high, mid, low). Our results provide evidence for a global organization for the segments involved in these cluster-vowel combinations. This is reflected in a number of ways: compression of the prevocalic consonant and reduction of CV timing in the word-medial cluster case compared to its singleton paired word in both stop-lateral and s-stop clusters, early vowel initiation (as permitted by the clusters' phonetic properties), and presence of compensatory relations between phonetic properties of different segments or intersegmental transitions within each cluster. In other words, we find that the global organization presiding over the segments partaking in these word-medial tautosyllabic CCVs is pleiotropic, that is, simultaneously expressed in multiple phonetic exponents rather than via a privileged metric such as c-center stability or any other such given single measure employed in previous works.}, language = {en} } @article{MokariGafosWilliams2021, author = {Mokari, Payam Ghaffarvand and Gafos, Adamantios I. and Williams, Daniel}, title = {Perceptuomotor compatibility effects in vowels}, series = {JASA Express Letters}, volume = {1}, journal = {JASA Express Letters}, number = {1}, publisher = {American Institute of Physics}, address = {Melville}, issn = {2691-1191}, doi = {10.1121/10.0003039}, pages = {8}, year = {2021}, abstract = {In a cue-distractor task, speakers' response times (RTs) were found to speed up when they perceived a distractor syllable whose vowel was identical to the vowel in the syllable they were preparing to utter. At a more fine-grained level, subphonemic congruency between response and distractor-defined by higher number of shared phonological features or higher acoustic proximity-was also found to be predictive of RT modulations. Furthermore, the findings indicate that perception of vowel stimuli embedded in syllables gives rise to robust and more consistent perceptuomotor compatibility effects (compared to isolated vowels) across different response-distractor vowel pairs.}, language = {en} } @article{KuberskiGafos2021, author = {Kuberski, Stephan R. and Gafos, Adamantios I.}, title = {Fitts' law in tongue movements of repetitive speech}, series = {Phonetica : international journal of phonetic science}, volume = {78}, journal = {Phonetica : international journal of phonetic science}, number = {1}, publisher = {De Gruyter Mouton}, address = {Berlin}, issn = {0031-8388}, doi = {10.1159/000501644}, pages = {3 -- 27}, year = {2021}, abstract = {Fitts' law, perhaps the most celebrated law of human motor control, expresses a relation between the kinematic property of speed and the non-kinematic, task-specific property of accuracy. We aimed to assess whether speech movements obey this law using a metronome-driven speech elicitation paradigm with a systematic speech rate control. Specifically, using the paradigm of repetitive speech, we recorded via electromagnetic articulometry speech movement data in sequences of the form /CV.../ from 6 adult speakers. These sequences were spoken at 8 distinct rates ranging from extremely slow to extremely fast. Our results demonstrate, first, that the present paradigm of extensive metronome-driven manipulations satisfies the crucial prerequisites for evaluating Fitts' law in a subset of our elicited rates. Second, we uncover for the first time in speech evidence for Fitts' law at the faster rates and specifically beyond a participant-specific critical rate. We find no evidence for Fitts' law at the slowest metronome rates. Finally, we discuss implications of these results for models of speech.}, language = {en} } @article{HoehleFritzscheBollAvetisyanetal.2021, author = {H{\"o}hle, Barbara and Fritzsche, Tom and Boll-Avetisyan, Natalie and Hullebus, Marc and Gafos, Adamantios I.}, title = {Respect the surroundings}, series = {JASA Express Letters}, volume = {1}, journal = {JASA Express Letters}, number = {2}, publisher = {AIP Publ.}, address = {Melville}, issn = {2691-1191}, doi = {10.1121/10.0003574}, pages = {7}, year = {2021}, abstract = {Fourteen-month-olds' ability to distinguish a just learned word, /bu?k/, from its minimally different word, /du?k/, was assessed under two pre-exposure conditions: one where /b, d/-initial forms occurred in a varying vowel context and another where the vowel was fixed but the final consonant varied. Infants in the experiments benefited from the variable vowel but not from the variable final consonant context, suggesting that vowel variability but not all kinds of variability are beneficial. These results are discussed in the context of time-honored observations on the vowel-dependent nature of place of articulation cues for consonants.}, language = {en} } @misc{HoehleFritzscheMessetal.2020, author = {H{\"o}hle, Barbara and Fritzsche, Tom and Meß, Katharina and Philipp, Mareike and Gafos, Adamantios I.}, title = {Only the right noise?}, series = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, journal = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, number = {5}, issn = {1866-8364}, doi = {10.25932/publishup-51667}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-516674}, pages = {18}, year = {2020}, abstract = {Seminal work by Werker and colleagues (Stager \& Werker [1997]Nature, 388, 381-382) has found that 14-month-old infants do not show evidence for learning minimal pairs in the habituation-switch paradigm. However, when multiple speakers produce the minimal pair in acoustically variable ways, infants' performance improves in comparison to a single speaker condition (Rost \& McMurray [2009]Developmental Science, 12, 339-349). The current study further extends these results and assesses how different kinds of input variability affect 14-month-olds' minimal pair learning in the habituation-switch paradigm testing German learning infants. The first two experiments investigated word learning when the labels were spoken by a single speaker versus when the labels were spoken by multiple speakers. In the third experiment we studied whether non-acoustic variability, implemented by visual variability of the objects presented together with the labels, would also affect minimal pair learning. We found enhanced learning in the multiple speakers compared to the single speaker condition, confirming previous findings with English-learning infants. In contrast, visual variability of the presented objects did not support learning. These findings both confirm and better delimit the beneficial role of speech-specific variability in minimal pair learning. Finally, we review different proposals on the mechanisms via which variability confers benefits to learning and outline what may be likely principles that underlie this benefit. We highlight among these the multiplicity of acoustic cues signalling phonemic contrasts and the presence of relations among these cues. It is in these relations where we trace part of the source for the apparent paradoxical benefit of variability in learning.}, language = {en} } @article{HoehleFritzscheMessetal.2020, author = {H{\"o}hle, Barbara and Fritzsche, Tom and Meß, Katharina and Philipp, Mareike and Gafos, Adamantios I.}, title = {Only the right noise?}, series = {Developmental Science}, volume = {23}, journal = {Developmental Science}, number = {5}, publisher = {Wiley-Blackwell}, address = {Oxford}, issn = {1363-755X}, doi = {10.1111/desc.12950}, pages = {1 -- 16}, year = {2020}, abstract = {Seminal work by Werker and colleagues (Stager \& Werker [1997]Nature, 388, 381-382) has found that 14-month-old infants do not show evidence for learning minimal pairs in the habituation-switch paradigm. However, when multiple speakers produce the minimal pair in acoustically variable ways, infants' performance improves in comparison to a single speaker condition (Rost \& McMurray [2009]Developmental Science, 12, 339-349). The current study further extends these results and assesses how different kinds of input variability affect 14-month-olds' minimal pair learning in the habituation-switch paradigm testing German learning infants. The first two experiments investigated word learning when the labels were spoken by a single speaker versus when the labels were spoken by multiple speakers. In the third experiment we studied whether non-acoustic variability, implemented by visual variability of the objects presented together with the labels, would also affect minimal pair learning. We found enhanced learning in the multiple speakers compared to the single speaker condition, confirming previous findings with English-learning infants. In contrast, visual variability of the presented objects did not support learning. These findings both confirm and better delimit the beneficial role of speech-specific variability in minimal pair learning. Finally, we review different proposals on the mechanisms via which variability confers benefits to learning and outline what may be likely principles that underlie this benefit. We highlight among these the multiplicity of acoustic cues signalling phonemic contrasts and the presence of relations among these cues. It is in these relations where we trace part of the source for the apparent paradoxical benefit of variability in learning.}, language = {en} } @article{SotiropoulouGibsonGafos2020, author = {Sotiropoulou, Stavroula and Gibson, Mark and Gafos, Adamantios I.}, title = {Global organization in Spanish onsets}, series = {Journal of phonetics}, volume = {82}, journal = {Journal of phonetics}, publisher = {Elsevier}, address = {London}, issn = {0095-4470}, doi = {10.1016/j.wocn.2020.100995}, pages = {22}, year = {2020}, abstract = {This paper addresses the relation between syllable structure and inter-segmental temporal coordination. The data examined are Electromagnetic Articulometry recordings from six speakers of Central Peninsular Spanish (henceforth, Spanish), producing words beginning with the clusters /pl, bl, kl, gl, p(sic), k(sic), t(sic)/ as well as corresponding unclustered sonorant-initial words in three vowel contexts /a, e, o/. In our results, we find evidence for a global organization of the segments involved in these combinations. This is reflected in a number of ways: shortening of the prevocalic sonorant in the cluster-initial case compared to the unclustered case, reorganization of the relative timing of the internal CV subsequence (in a CCV) in the obstruent-lateral context, early vowel initiation, and a strong compensatory relation between the duration of the obstruent-to-lateral transition and the duration of the lateral. In other words, we find that the global organization presiding over the segments partaking in these tautosyllabic CCVs is pleiotropic, that is, simultaneously expressed over a set of different phonetic parameters rather than via a privileged metric such as c-center stability or any other such given single measure (employed in prior works).}, language = {en} } @article{GafosLieshout2020, author = {Gafos, Adamantios I. and Lieshout, Pascal H. H. M. van}, title = {Models and theories of speech production}, series = {Frontiers in psychology}, volume = {11}, journal = {Frontiers in psychology}, publisher = {Frontiers Research Foundation}, address = {Lausanne}, issn = {1664-1078}, doi = {10.3389/fpsyg.2020.01238}, pages = {4}, year = {2020}, language = {en} } @article{GhaffarvandMokariGafosWilliams2020, author = {Ghaffarvand-Mokari, Payam and Gafos, Adamantios I. and Williams, Daniel}, title = {Perceptuomotor compatibility effects in vowels}, series = {Attention, perception, \& psychophysics}, volume = {82}, journal = {Attention, perception, \& psychophysics}, number = {5}, publisher = {Springer}, address = {New York}, issn = {1943-3921}, doi = {10.3758/s13414-020-02014-1}, pages = {2751 -- 2764}, year = {2020}, abstract = {Perceptuomotor compatibility between phonemically identical spoken and perceived syllables has been found to speed up response times (RTs) in speech production tasks. However, research on compatibility effects between perceived and produced stimuli at the subphonemic level is limited. Using a cue-distractor task, we investigated the effects of phonemic and subphonemic congruency in pairs of vowels. On each trial, a visual cue prompted individuals to produce a response vowel, and after the visual cue appeared a distractor vowel was auditorily presented while speakers were planning to produce the response vowel. The results revealed effects on RTs due to phonemic congruency (same vs. different vowels) between the response and distractor vowels, which resemble effects previously seen for consonants. Beyond phonemic congruency, we assessed how RTs are modulated as a function of the degree of subphonemic similarity between the response and distractor vowels. Higher similarity between the response and distractor in terms of phonological distance-defined by number of mismatching phonological features-resulted in faster RTs. However, the exact patterns of RTs varied across response-distractor vowel pairs. We discuss how different assumptions about phonological feature representations may account for the different patterns observed in RTs across response-distractor pairs. Our findings on the effects of perceived stimuli on produced speech at a more detailed level of representation than phonemic identity necessitate a more direct and specific formulation of the perception-production link. Additionally, these results extend previously reported perceptuomotor interactions mainly involving consonants to vowels.}, language = {en} }