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Author Spotlight: Investigating the Impact of Emotional Prosodies on Voice Recognition and Perception
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Voice Familiarization Training Improves Speech Intelligibility and Reduces Listening Effort.

Freja Baxter1, Harriet J Smith1, Emma Holmes1

  • 1Division of Psychology and Language Sciences, Department of Speech Hearing and Phonetic Sciences, University College London, London, UK.

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Familiar voices require less listening effort, especially after extensive training. Both self-reports and pupil dilation indicate reduced effort for familiar voices, with longer training showing greater benefits.

Keywords:
cocktail party listeningeffortpupillometryspeaker familiarityspeech perceptionvoice familiarity

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Area of Science:

  • Auditory Perception
  • Speech Processing
  • Cognitive Psychology

Background:

  • Speech intelligibility improves with voice familiarity in noisy environments.
  • The impact of voice familiarity on listening effort remains largely unexplored.
  • Understanding how familiarity affects cognitive load in speech perception is crucial.

Purpose of the Study:

  • To investigate whether familiar voices reduce listening effort compared to unfamiliar voices.
  • To examine the role of training duration in familiarizing voices and its effect on effort.
  • To compare subjective (self-report) and physiological (pupil dilation) measures of listening effort.

Main Methods:

  • Participants were trained on three voices for varying durations (88, 166, 478 sentences).
  • A speech intelligibility task involved identifying target sentences amidst competing speech at different target-to-masker ratios (-6 dB, +3 dB).
  • Listening effort was assessed using self-reported ratings and pupil dilation.

Main Results:

  • Self-reported listening effort was lower at +3 dB than -6 dB target-to-masker ratio.
  • Self-reported effort was reduced for all trained voices compared to unfamiliar voices.
  • Pupil dilation showed reduced effort only for the most extensively trained voice (approx. 1 hour).

Conclusions:

  • Voice familiarity, particularly with extensive training, can reduce listening effort.
  • Self-report measures are sensitive to effort reduction even after short training periods.
  • Both subjective and physiological measures support the benefit of voice familiarity for reduced listening effort.