Sökning: "Francisco Lacerda"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden Francisco Lacerda.

  1. 1. Effects of peripheral auditory adaptation on the discrimination of speech sounds

    Författare :Francisco Lacerda; Hartmut Traunmüller; Olle Engstrand; Björn Lindblom; Louis Pols; Stockholms universitet; []
    Nyckelord :HUMANITIES; HUMANIORA; HUMANIORA; HUMANITIES; Adaptation; discrimination; categorical perception; Phonetics; Fonetik; Phonetics; fonetik;

    Sammanfattning : This study investigates perceptual effects of discharge rate adaptation in the auditory-nerve fibers. Discrimination tests showed that brief synthetic stimuli with stationary formants and periodic source were better discriminated when they had an abrupt as opposed to a gradual onset (non-adapted vs adapted condition). LÄS MER

  2. 2. Emergence of words : Multisensory precursors of sound-meaning associations in infancy

    Författare :Eeva Klintfors; Francisco Lacerda; Daniel Swingley; Stockholms universitet; []
    Nyckelord :HUMANITIES; HUMANIORA; HUMANIORA; HUMANITIES; language acquisition; word acquisition; auditory-visual; multisensory; sound-meaning association; distributional learning; perceptual salience; infancy; språkinlärning; ordinlärning; audio-visuell; multisensorisk; förbindelser mellan ljud och betydelse; distributionell inlärning; perceptuell prominens; spädbarn; Phonetics; Fonetik; Phonetics; fonetik;

    Sammanfattning : This thesis presents four experimental studies, carried out at the Phonetic laboratory, Stockholm University, on infants’ ability to establish auditory-visual sound-meaning associations as a precursor of early word acquisition. Study I reports on the effect of linguistic variance on infants’ ability (3- to 20-months) to establish sound-meaning associations. LÄS MER

  3. 3. Alternative Measures of Phonation: Collision Threshold Pressure and Electroglottographic Spectral Tilt : Extra: Perception of Swedish Accents

    Författare :Laura Enflo; David House; Jonas Beskow; Sten Ternström; Francisco Lacerda; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustics; Akustik;

    Sammanfattning : The collision threshold pressure (CTP), i.e. the smallest amount of subglottal pressure needed for vocal fold collision, has been explored as a possible complement or alternative to the now commonly used phonation threshold pressure (PTP), i.e. LÄS MER

  4. 4. The language learning infant: Effects of speech input, vocal output, and feedback

    Författare :Lisa Gustavsson; Francisco Lacerda; Roger Moore; Stockholms universitet; []
    Nyckelord :HUMANITIES; HUMANIORA; HUMANIORA; HUMANITIES; human; language; language acquisition; perception; production; humanoid; development; model; embodied system; speech signal processing; vocal tract morphology; acoustic; speech input; information processing; scaling; interaction; growth; infant; imitation; feedback; perceptual salience; modeling; Phonetics; Fonetik; Phonetics; fonetik;

    Sammanfattning : This thesis studies the characteristics of the acoustic signal in speech, especially in speech directed to infants and in infant vocal development, to gain insight on essential aspects of speech processing, speech production and communicative interaction in early language acquisition. Three sets of experimental studies are presented in this thesis. LÄS MER

  5. 5. Perceptual reorganization of vowels : Separating the linguistic and acoustic parts of the mismatch response

    Författare :Ellen Marklund; Francisco Lacerda; Iris-Corinna Schwarz; Riitta Salmelin; Stockholms universitet; []
    Nyckelord :HUMANITIES; HUMANIORA; HUMANIORA; HUMANITIES; language acquisition; infants; speech perception; MMR; MMN; perceptual reorganization; Linguistics; lingvistik;

    Sammanfattning : During the first year of life, infants go from perceiving speech sounds primarily based on their acoustic characteristics, to perceiving speech sounds as belonging to speech sound categories relevant in their native language(s). The transition is apparent in that very young infants typically discriminate both native and non-native speech sound contrasts, whereas older infants show better discrimination for native contrasts and worse or no discrimi­na­tion for non-native contrasts. LÄS MER