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  • 1. Czigler, Peter E.
    et al.
    Karlsson, Fredrik
    Umeå University, Faculty of Arts, Department of language studies.
    Poussa, Patricia
    Umeå University, Faculty of Arts, Department of language studies.
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Department of language studies.
    Language learning through fuzzy ears: one cause of identity loss? Some preliminary thoughts from an experimental case study2008In: Tidskrift för lärarutbildning och forskning / Journal of Research in Teacher Education., ISSN 14047659, Vol. 15, no 2, 23-37 p.Article in journal (Refereed)
  • 2.
    Karlsson, Fredrik
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Are homonyms in consonant cluster productions caused by articulatory or perceptual processes: A discussion based on one child's development2003In: Proceedings from FONETIK 2003, 2003, 73-76 p.Conference paper (Other academic)
  • 3.
    Karlsson, Fredrik
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Development of adult-like place and manner of articulation in initial sC clusters2005In: Proceedings FONETIK 2005: XVIIIth Swedish Phonetics Conference, 2005, 71-74 p.Conference paper (Other academic)
    Abstract [en]

    Previous investigations have proposed that nasality in consonants are more perceptually stable than place of articulation inconstrained conditions. This paper investigates the progression of initial consonant clusters from a reduced to an adult-like form in terms of manner and place of articulation in the speech of children between the age of 1;6 and 3;5. The results show an earlier onset of stable production of manner compared to place for in both full clusters and in the reduced form. The results are interpreted as evidence of the importance of perceptual salience of segmental properties in the acquisition initial consonant clusters.

  • 4.
    Karlsson, Fredrik
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Development of Complex Syllable Onsets: Evidence from duration measurements2004In: Proceedings from the XVIIth Swedish Phonetics Conference, 2004, 100-103 p.Conference paper (Other academic)
    Abstract [en]

    This paper investigates the emergence of complex syllable onsets through measurements of their duration compared to the duration of corresponding singleton syllable onsets. The results show that there is a difference in the progression in syllable onset duration that is dependent on subject age and onset structure.

  • 5.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Blomstedt, Patric
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Olofsson, Katarina
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Otorhinolaryngology.
    Linder, Jan
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Nordh, Erik
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    van Doorn, Jan
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Control of phonatory onset and offset in Parkinson patients following deep brain stimulation of the subthalamic nucleus and caudal Zona Incerta2012In: Parkinsonism & Related Disorders, ISSN 1353-8020, E-ISSN 1873-5126, Vol. 18, no 7, 824-827 p.Article in journal (Refereed)
    Abstract [en]

    Laryngeal hypokinesia is a common symptom in Parkinson’s disease (PD) that affects quality of life. Deep brain stimulation (DBS) is well recognized as a complementary method for treatment of motor symptoms in PD but the outcomes on patients’ control over phonatory alternation have yet not been clearly elucidated. The present study examined the effect of subthalamic nucleus STN-DBS (n=8, aged 51-72 yrs; median=63 yrs) and caudal Zona incerta cZi-DBS (n=8,aged 49-71 yrs; median=61 yrs) on control of onset and offset of phonation in connected speech. The patients were evaluated in a preoperatively (Med ON, 1.5 times the ordinary Levodopa dose) and 12 months postoperatively (Med ON, ordinary Levodopa dose). The results provided evidence of a progressive reduction in the ability to manifest alternations between voicing and voiceless states in a reading task. Mean proportion produced with inappropriate voicing increased from 47.6% to 55.3% and from 62.9% to 68.6% of the total duration for the two groups of patients between Pre-op and Post-op, Stim OFF evaluations. The medial and final parts of the fricative were more affected than the initial part, indicating an increased voicing lead into the following vowel. We propose that this reduction in phonatory control is be due to either progression of the disease, an effect of reduced Levodopa dosage or a microlesional effect. Patients’ proficiency in alternating between voiced and voiceless states in connected speech remained unaffected by both STN-DBS and cZi-DBS.

  • 6.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Arts, Philosophy and Linguistics. Lingvistik.
    Czigler, Peter
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Philosophy and Linguistics. Lingvistik.
    Using Voice Onset Time for Estimating Production Maturity of /sP/ clusters2005In: Proceedings from the X International Congress For the Study of Child Language, 2005Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    In previous investigations of the child’s acquisition of simple and complex syllable onsets in word initial position, a number of developmental trends have been observed. In the early stages of development, plosives have been reported to be substituted by a plosive at another, usually more fronted, place of articulation. Initial fricatives, on the other hand, have been reported to be substituted by plosive-like speech segments. At later stages of development, the child’s productions of plosives and fricatives in word initial position have been transcribed as increasingly adult-like.

    As to complex syllable onsets, children’s’ productions have been reported to go through stages of reduction or simplification at the onset of attempted cluster production. In an earlier investigation, the progression through this stage in development has been investigated acoustically through measurement of voice onset time and aspiration (Karlsson et al., 2002). The results indicated a strong tendency towards short lagged voice onset time at the onset of production of voiceless plosives and long lagged voice onset time at later stages, for the same speech sound category.

    This paper presents an investigation of the correlation between development in consonant quality and acoustic correlates of voicing and aspiration in the productions of children aged 77-218 weeks. Productions of target words with an initial fricative, voiced plosive, voiceless plosive or s+plosive cluster were collected from 21 children (12 male and 9 female) who were recorded at monthly intervals for up to one year per child. The total number of syllable onsets analysed was 4133. Using this corpus, the correlation of onset of production of plosives with non-fronted target places of articulation and the rise in mean voice onset time length are currently under investigation. The investigation includes correlations between time of reaching a steady state in voice onset time, aspiration length and the time of steady production of consonants with adult quality. Finally, correlation between the time of onset of production of complex syllable onsets will be considered and included in the model.

    The results from the correlation study will be presented and the implications for the study of consonant cluster production development will be discussed.

  • 7.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Doorn, Jan van
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Letter to the Editor2012In: Journal of Voice, ISSN 0892-1997, E-ISSN 1873-4588, Vol. 26, no 5, 676.e1Article in journal (Other academic)
  • 8.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Arts, Department of language studies.
    Doorn, Jan van
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Vowel formant dispersion as a measure of articulation proficiency2012In: Journal of the Acoustical Society of America, ISSN 0001-4966, Vol. 132, no 4, 2633-2641 p.Article in journal (Refereed)
    Abstract [en]

    The articulatory range of a speaker has previously been estimated by the shape formed by first and second formant measurements of produced vowels. In a majority of the currently available metrics, formant frequency measurements are reduced to a single estimate for a condition, which has adverse consequences for subsequent statistical testing. Other metrics provide estimates of size of vowel articulation changes only, and do not provide a method for studying the direction of the change. This paper proposes an alternative approach. Vowel formant frequencies are re-defined as vectors originating from a defined center point of the vowel space fixed to a basic three-vowel frame. The euclidian length of the vectors, the Vowel Formant Dispersion (VFD), can be compared across conditions for evidence of articulatory expansions or reductions across conditions or speaker groups. Further, the angle component of the vowel vectors allows for analyses of direction of the reduction or expansion. Based on the range of investigations afforded by the VFD metric, and simulation experiments that compare its statistical properties with those of other proposed metrics, it is argued that the VFD procedure offers an enhanced view of vowel articulation change over rival metrics.

  • 9.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Landgren, Tomas
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Utveckling av Voice Onset Time hos svenska barn2006In: Tionde Nordiska Barnspråkssymposiet / [ed] Mårten Eriksson, Antti Ylikiiskilä & Eva Berglund, Gävle: Högskolan i Gävle , 2006, 69-75 p.Conference paper (Other academic)
  • 10.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Olofsson, Katarina
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Otorhinolaryngology.
    Blomstedt, Patric
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Neurosurgery.
    Linder, Jan
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Neurology.
    Doorn, Jan van
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Pitch variability in patients with Parkinson’s disease: effects of deep brain stimulation of caudal zona incerta and subthalamic nucleus2013In: Journal of Speech, Language and Hearing Research, ISSN 1092-4388, E-ISSN 1558-9102, Vol. 56, no 1, 150-158 p.Article in journal (Refereed)
    Abstract [en]

    Objective The purpose of the present study was to examine the effect of deep brain stimulation (DBS) of the subthalamic nucleus (STN) and the caudal zona incerta (cZi) pitch characteristics of con- nected speech in patients with Parkinson’s disease (PD).

    Methods Sixteen patients were evaluated preoperatively and 12 months after DBS surgery. Eight pa- tients were implanted in the STN (aged 51-72 yrs; xC=63 yrs). Six received bilateral implanta- tion and two unilateral (left) implantation. Eight patients were bilaterally implanted in the cZi (aged 49-71 yrs; xC=60.8 yrs). Preoperative assessments were made after an L-Dopa challenge (approximately 1.5 times the ordinary dose). All postoperative examinations were made off and on stimulation, with a clinically optimized dose of L-dopa. Measurements of pitch range and var- iability were obtained from each utterance in a recorded read speech passage.

    Results Pitch range and coefficient of variation showed an increase in patients under STN-DBS. Patients under cZi-DBS showed no significant effects of treatment on investigated pitch properties.

    Conclusions STN-DBS was shown to increase pitch variation and range. The results provided no evidence of cZi-DBS having a beneficial effect on PD patients’ pitch variability. 

  • 11.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Kvantifiering av inlärning av tonande/tonlös kontrast med hjälp av Voice Onset Time2006In: Tionde Nordiska Barnspråkssymposiet / [ed] Mårten Eriksson, Antti Ylikiiskilä & Eva Berglund, Gävle: Högskolan i Gävle , 2006, 60-68 p.Conference paper (Other academic)
  • 12.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Arts, Philosophy and Linguistics. Lingvistik.
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Philosophy and Linguistics. Lingvistik.
    /sP/ consonant clusters in Swedish: Acoustic measurements of phonological development2005In: Developmental Paths in Phonological Acquisition: Special issue of Leiden Papers in Linguistics 2.1, 2005Conference paper (Other academic)
    Abstract [en]

    This paper presents a cross-sectional and longitudinal investigation into the development of a contrast in voicing production in simple and complex consonant clusters for 21 children. The results showed that, although the group results indicated a progression that may have been caused either by development in articulatory proficiency or by an growing underlying representation, individual children develop in a manner that is not consistent with a developmental model postulating only articulatory development.

  • 13.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    The use of relativization in the regional dialect of Swedish spoken in Burträsk2002In: Relativisation in the North Sea Littoral, Lincom Europa , 2002, 97-107 p.Chapter in book (Other academic)
  • 14.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Czigler, Peter E.
    van Doorn, Jan
    Faculty of Medicine, Clinical Sciences.
    Acoustic correlates of voicing in a child's production of plosives2002In: Proceedings of the 9th Australian International Conference on Speech Science & Technology, 2002Conference paper (Other academic)
  • 15.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Arts, Department of language studies.
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Department of language studies.
    Svonni, Michael
    Umeå University, Faculty of Arts, Department of language studies.
    Van Doorn, Janis
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Wenstedt, Ola
    The acoustic manifestation of consonant gradation in Northern Sami2008In: Journal of the Acoustical Society of America, Vol. 123, no 5 (part 2), 3885- p.Article in journal (Refereed)
  • 16.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Arts, Philosophy and Linguistics. Lingvistik.
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Philosophy and Linguistics. Lingvistik.
    van Doorn, Jan
    Umeå University, Faculty of Medicine, Clinical Sciences, Speech and Language Therapy.
    Czigler, Peter E.
    Då or Tå, Pår or Bår - Seeing is believing!2003In: Proceeding of the 15th International Congress of Phonetic Sciences, 2003Conference paper (Other academic)
    Abstract [en]

    Several acoustic properties of plosives have been established as correlates of voicing contrast, including voice onset time (VOT), F1 cut-back, aspiration duration and initial F1 and F2 transition. Therefore, acquisition of the voicing contrast for plosives could be viewed as gaining the ability to combine interacting acoustic cues in an adult-like manner, resulting in a large number of possible developmental routes. The presented investigation examined initial plosives produced by one child from ages 18¿31 months that had been judged as voiced in an auditory analysis. The results show that some perceptually voiced and unaspirated plosives (elicited using voiceless targets) were produced with VOT values within the range of voiceless plosives for adult speakers of Swedish, and also had increased duration of high frequency, aperiodic friction after plosive release. It was conjectured that the child was attempting a voicing contrast by using increased VOT and increased duration of aperiodic friction that were not perceptible to adult listeners.

  • 17.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Unger, Elin
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Wahlgren, Sofia
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Blomstedt, Patric
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Linder, Jan
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Nordh, Erik
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Zafar, Hamayun
    Umeå University, Faculty of Medicine, Department of Odontology, Clinical Oral Physiology.
    Doorn, Jan van
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Deep brain stimulation of caudal zona incerta and subthalamic nucleus in patients with Parkinson’s disease: effects on diadochokinetic rate2011In: Parkinson’s Disease, ISSN 2042-0080, Vol. 2011, 605607- p.Article in journal (Refereed)
    Abstract [en]

    The hypokinetic dysarthria observed in Parkinson's disease (PD) affects the range, speed, and accuracy of articulatory gestures in patients, reducing the perceived quality of speech acoustic output in continuous speech. Deep brain stimulation (DBS) of the subthalamic nucleus (STN-DBS) and of the caudal zona incerta (cZi-DBS) are current surgical treatment options for PD. This study aimed at investigating the outcome of STN-DBS (7 patients) and cZi-DBS (7 patients) in two articulatory diadochokinesis tasks (AMR and SMR) using measurements of articulation rate and quality of the plosive consonants (using the percent measurable VOT metric). The results indicate that patients receiving STN-DBS increased in articulation rate in the Stim-ON condition in the AMR task only, with no effect on production quality. Patients receiving cZi-DBS decreased in articulation rate in the Stim-ON condition and further showed a reduction in production quality. The data therefore suggest that cZi-DBS is more detrimental for extended articulatory movements than STN-DBS.

  • 18.
    Karlsson, Fredrik
    et al.
    Umeå University, Faculty of Arts, Philosophy and Linguistics. Lingvistik.
    Zetterholm, Elisabeth
    Umeå University, Faculty of Arts, Philosophy and Linguistics. Lingvistik.
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Philosophy and Linguistics. Lingvistik.
    Development of a Gender Difference in Voice Onset Time2004In: Proceedings of the 10th Australian International Conference on Speech Science & Technology, 2004Conference paper (Refereed)
    Abstract [en]

    This paper investigates the effect of gender on voice onset time distribution at three stages of speech development. Two subject groups consisting of children, aged approximately 3 and 9 years, were compared to adult speakers regarding voice onset time of initial plosives. The results showed significant gender effects in the aspirated plosives in the young subjects that were not present in the plosives produced by adults. It is hypothesised that the effect of gender at the earlier stages of develpment may be due to the differences in airflow intensity and variability.

  • 19.
    Landgren, Tomas
    et al.
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Karlsson, Fredrik
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Sullivan, Kirk P H
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    Eriksson, Anders
    Umeå University, Faculty of Arts, Philosophy and Linguistics.
    A comparison of the use of relatization in the Swedish regional dialects spoken in Burträsk and Ström2002In: Preceedings to the XI:th International Conference on Methods in Dialectology, 2002Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    The data presented in this paper comes from tape recordings made as part of the dialect project "The phonetics and phonology of the Swedish dialects around the year 2000, SWEDIA 2000". Karlsson and Sullivan (in press) investigated relative marker usage in Burträsk. Due to its situation at the northern periphery of the Swedish dialect rectangle and as a non-coastal settlement, Karlsson and Sullivan (in press) believed that the Burträsk dialect may well reveal traces of older variants of Swedish. As the SWEDIA dialect database is balanced for informant gender and age, it permitted the investigation of both the infiltration of standard Swedish relativizers into this northern dialect of Swedish and the influence of gender in any other change that may have occurred during the twentieth century. From the tape-recordings of eight informants' spontaneous speech lasting a total of 7 hours and 35 minutes, Karlsson and Sullivan (in press) found a strong preference in the Burträsk dialect for relative clause constructions involving a moving (realized) subject, that relativization involving object movement is also used, but less frequently, and that in relative clauses involving the null relative marker, subject and object correlates occur with equal frequency. Further, no significant difference in relative marker usage was found due to either age or gender. Of particular note was that no examples of the use of constructions using a wh-word, such as vars or vilken/vilket were found in the data provided by any of the eight informants. Unlike, the complementizer som that was found in the data vars or vilken/vilket always imply a more formal, or standard, speaking style. This paper extends the Karlsson and Sullivan study by posing the same questions in relation to the dialect spoken in Ström and thereafter by comparing and constrasting the Ström data with the Burträsk data. Like Burträsk, Ström is a non-coastal settlement. It lies around 350km southwest of Burträsk and has since the middle ages been a trading centre. Of particular interest is that Ström lies in Jämtland, which was part of Norway until 1645. The comparative data presented in this paper may provide picture of how the use of relativization is affected when a settlement has contact with neighbouring dialects due to its position as a training centre and due to its less peripheral location within the Swedish Dialect Rectangle.

  • 20.
    Lundgren, Sofie
    et al.
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Saeys, Thomas
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Karlsson, Fredrik
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Olofsson, Katarina
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Otorhinolaryngology.
    Blomstedt, Patric
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Linder, Jan
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Nordh, Erik
    Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience, Clinical Neuroscience.
    Zafar, Hamayun
    Umeå University, Faculty of Medicine, Department of Odontology, Clinical Oral Physiology.
    Doorn, Jan van
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Deep brain stimulation of caudal zona incerta and subthalamic nucleus in patients with Parkinson’s disease: effects on voice intensity2011In: Parkinson’s Disease, ISSN 2042-0080, Vol. 2011, 658956- p.Article in journal (Refereed)
    Abstract [en]

    Deep brain stimulation of the subthalamic nucleus (STN-DBS) in patients with Parkinson’s disease (PD) affects speech in small, inconsistent ways. However, voice intensity generally increases. Recently the caudal zona inserta (cZi) has been investigated as an alternate target in DBS treatment of PD. The effects of cZi-DBS on voice intensity have not yet been investigated. The aim of this study was to compare the voice intensity effects of cZi-DBS and STN-DBS in PD patients. Voice intensity during reading and intensity decay during rapid syllable repetition were measured for eight STN-DBS and eight cZi-DBS patients in a pre-surgical baseline and then on- and off-stimulation 12 months after surgery. Voice intensity on-stimulation was larger than off-stimulation for the STN-DBS patients, but smaller for the cZi-DBS patients. There were no significant changes in intensity decay. The results suggest that cZi and STN are involved differently in neuromuscular control of the speech respiratory subsystem.

  • 21.
    Mennen, Ineke
    et al.
    ESRC Centre for Research on Bilingualism, Bangor University.
    Chen, Aujo
    Max Planck Institute for Psycholinguistics, Nijmegen.
    Karlsson, Fredrik
    Umeå University, Faculty of Arts, Department of language studies.
    Characterising the internal structure of learner intonation and its development over time2010In: Proceedings of The 6th International Symposium on the Acquisition of Second Language Speech (Newsounds 2010), 2010Conference paper (Refereed)
    Abstract [en]

    This paper describes the internal structure and longitudinal development of L2 learner intonation in two groups of three speakers from structurally different source languages (Punjabi and Italian) learning the same target language (English). The speakers were recently arrived immigrants in their host country and were followed over a period of thirty months. During this period, their intonation was analysed at two longitudinal points along three dimensions of the intonation system: (i) the inventory of structural elements (pitch accents and boundary tones); (ii) the way these are realised; and (iii) their distribution. Some attention is also paid to the functional aspect of learner intonation. Results show that there are many similarities across speakers in most dimensions of intonation. It seems that learners start out with the same inventory of structural elements from the start of their learning, regardless of the source language of the learners, although there are some differences in the frequency of use of certain patterns and the rate at which the system develop

  • 22.
    van Doorn, Jan
    et al.
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Karlsson, Fredrik
    Umeå University, Faculty of Arts, Department of language studies.
    Sullivan, Kirk P. H.
    Umeå University, Faculty of Arts, Department of language studies.
    An acoustic investigation of the Swedish child’s acquisition of obstruent place of articulation2008In: Acoustics'08 Paris : June 29 - July 4, 2008, Paris: Société Française d'Acoustique (SFA) , 2008, 681-686 p.Conference paper (Other academic)
    Abstract [en]

    Speech produced by children in the initial stages of development does generally not uphold as many phonetic distinctions as speech sounds produced by adults. A child's productions of different target words may therefore have similar acoustic properties and result in homonyms being perceived by the adult observer. This study presents a longitudional investigation into the development of place of articulation from non‐distinctive to distinctive productions in word‐initial obstruents produced by 22 Swedish children (aged 18 ‐ 48 months). The data was collected through monthly recordings, approximatelly one year per child. The acoustic correlates analysed were spectral diffuseness, spectral skewness and spectral tilt for plosives and spectral skewness, spectral kurtosis, spectral variance and F2 onset frequency for fricatives. The results show a developmental trend in spectral skewness that is indicative of a increasing number of acquired phonetic contrasts. Spectral tilt change, F2 onset frequency, spectral mean and spectral variance provide evicence of within‐category refinement wich is argued to be caused primarilly by advancements in motor control.

  • 23.
    van Doorn, Janis
    et al.
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Karlsson, Fredrik
    Umeå University, Faculty of Medicine, Department of Clinical Sciences, Speech and Language Therapy.
    Influence of speech task and utterance length on measurement of pitch variability in the speech of Parkinson's disease patients after deep brain stimulation2013In: Movement Disorders, ISSN 0885-3185, E-ISSN 1531-8257, Vol. 28, no Supplement 1, S448- p.Article in journal (Refereed)
1 - 23 of 23
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