Hearing in Complex Environments

72 Understanding Speech

Learning Objectives

Be able to describe why speech is hard to understand: the segmentation problem, co-articulation problem, speaker problem.

Know what the McGurk effect is.

Difficulty in segmenting phonemes: where does one stop and another start? Anyone who has learned a second language knows how difficult this is to figure out! People who study speech call this the segmentation problem.

Variability due to co-articulation: phonemes look/sound slightly different in different contexts. In a spectrogram, phonemes are characterized by formants (bands of constant sound during vowels) and transitions (onsets and offsets of formants, usually associated with consonants). A single phoneme will look very different on a spectrogram, depending on what syllable, word or phrase it is part of.

Variation in speaker styles: we all speak at different speeds, slur words together, etc. Human listeners employ a lot of social and contextual cues (e.g., visual cues) to figure out what people are saying. Computers do not have access to this information.

The McGurk effect shows how we use visual cues (as part of cue combination, which uses auditory plus visual cues) to ignore the variability and figure out which phoneme is which. In other words, what we see affects what we hear.

 

To learn more about the McGurk Effect, watch the video linked here and included below.

 

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Cheryl Olman PSY 3031 Detailed Outline
Provided by: University of Minnesota
Download for free at http://vision.psych.umn.edu/users/caolman/courses/PSY3031/
License of original source: CC Attribution 4.0

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Introduction to Sensation and Perception by Students of PSY 3031 and Edited by Dr. Cheryl Olman is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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