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  • 1Department of Psychological and Brain Sciences, University of Louisville, Louisville, Kentucky 40292, USAlilah.kahloon@louisville.edu, anya.shorey@louisville.edu, caleb.king.1@louisville.edu, christian.stilp@louisville.edu.

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Clear speech, often used in noisy environments, can alter how listeners perceive sounds. Slower speech rates in context sentences led to more "deer" perceptions, demonstrating speech rate normalization effects.

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Area of Science:

  • Speech perception research
  • Auditory neuroscience
  • Phonetics and phonology

Background:

  • Talkers modify speech (clear speech) in challenging listening conditions like noise or for hearing-impaired individuals.
  • Clear speech is typically slower than conversational speech.
  • Speaking rate influences speech perception via rate normalization, where context affects the interpretation of subsequent sounds.

Purpose of the Study:

  • To investigate the impact of clear and slowed speech on sound/word recognition.
  • To examine if speech rate normalization principles apply to clear speech contexts.

Main Methods:

  • Listeners were presented with context sentences (conversational, clear, or slowed conversational) followed by a target word.
  • The target word varied along a continuum from "deer" to "tier" to assess perceptual boundaries.
  • Listener responses were recorded to determine the perceived word.

Main Results:

  • Clear and slowed conversational context sentences resulted in a higher proportion of "deer" responses compared to standard conversational sentences.
  • This finding is consistent with the principle of speech rate normalization.

Conclusions:

  • Altering speaking style, such as using clear speech, impacts speech intelligibility.
  • Changes in speaking rate, even in clear speech, can influence sound and word recognition through mechanisms like rate normalization.