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EarlySpeechPerception_Nov9

EarlySpeechPerception_Nov9 - Speech Perception Suzanne van...

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Speech Perception Suzanne van der Feest , Ph.D. Department of Communication Sciences and Disorders
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Figure 11.6 The anatomy underlying speech production
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Perceiving Speech Peaks in speech spectrum: Formants Labeled by number, from lowest to highest (F 1 , F 2 , F 3 ) concentrations in energy occur at different frequencies, depending on length of vocal tract Spectrogram: A pattern for sound analysis that provides a three-dimensional display plotting time on the horizontal axis, frequency on the vertical axis, and intensity on a color or gray scale
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Figure 11.8 Frequency spectra and spectrograms
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Figure 11.9 Vowel sounds of English: formants and associated positions of the tongue
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Perceiving Language identifying rythmic structure (prosody) identifying sounds (categories) identifying (sounds in) words identifying word boundaries identifying phrasal structure / boundaries
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Speech Classifying speech sounds Ultimately, word and sentence meaning is accessed Sound: Most often described in terms of articulation Place of articulation (e.g., at lips, at alveolar ridge) Voicing: Whether the vocal cords are vibrating or not English: Only small sample of sounds used by languages around the world
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Speech Speech perception Computer programs: Still limited in recognizing speech because of various sources of variation Coarticulation Inter- and intraspeaker variation
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How do humans (babies!) do it?
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Perceptual bias towards speech sounds Preferences to female voices Discrimination of nonnative sounds Categorical perception Discrimination of phonemes Distinguishes between different rythmic classes Infant Perceptual Abilities
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Initial Sensitivities
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