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JLP374 - wk 1-4 - Speech Perception 3 issues Segmentation...

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Speech Perception 3 issues: Segmentation: Unlike exaggerated speech, natural speech has no real pauses, hard to line up start/stop in spectogram Lack of invariance problem: Individual sounds have blurry boundaries and coarticulation issues (/s/ in seep different from /s/ in soup in spectrogram due to ‘anticipation’ of the remainder of the word) Speaker Variability problem: Male vs female, child vs adult – all different. Like searching for a ‘dog’ in a group of Jack Russells and Dobermans. McGurk Effect: ‘baba’ sound heard as ‘dada’ when ‘baba’ is said with ‘dada’ mouth movements! Compare and Contrast: Cohort Theory: Features: Initial sounds define ‘cohorts’ (possible words) and each successive phonological info narrows Each word has ‘resting activation level’ – as word unfolds, compatible nodes activated and incompatible are deactivated Problem: does not work if the initial sound is ‘barred’ by noise! Trace Model: Features: Continuous activation (each successive sound unit in unfolding word provides independent source of evidence about word identity , regardless of what sounds came before) Uses top-down information (knowledge/expectations)
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