title: Development of the Russian matrix sentence test.
abstract: OBJECTIVE
  To develop the Russian matrix sentence test for speech intelligibility measurements in noise.
  
  
  METHODS
  Test development included recordings, optimization of speech material, and evaluation to investigate the equivalency of the test lists and training. For each of the 500 test items, the speech intelligibility function, speech reception threshold (SRT: signal-to-noise ratio, SNR, that provides 50% speech intelligibility), and slope was obtained. The speech material was homogenized by applying level corrections. In evaluation measurements, speech intelligibility was measured at two fixed SNRs to compare list-specific intelligibility functions. To investigate the training effect and establish reference data, speech intelligibility was measured adaptively.
  
  
  METHODS
  Overall, 77 normal-hearing native Russian listeners.
  
  
  RESULTS
  The optimization procedure decreased the spread in SRTs across words from 2.8 to 0.6 dB. Evaluation measurements confirmed that the 16 test lists were equivalent, with a mean SRT of -9.5 ± 0.2 dB and a slope of 13.8 ± 1.6%/dB. The reference SRT, -8.8 ± 0.8 dB for the open-set and -9.4 ± 0.8 dB for the closed-set format, increased slightly for noise levels above 75 dB SPL.
  
  
  CONCLUSIONS
  The Russian matrix sentence test is suitable for accurate and reliable speech intelligibility measurements in noise.
authors.affiliation: a * Medizinische Physik and Cluster of Excellence Hearing4all, Carl-von-Ossietzky Universität Oldenburg , Oldenburg , Germany.
authors.forename: Anna
authors.initials: A
authors.lastname: Warzybok
authors.affiliation: a * Medizinische Physik and Cluster of Excellence Hearing4all, Carl-von-Ossietzky Universität Oldenburg , Oldenburg , Germany.
authors.forename: Melanie
authors.initials: M
authors.lastname: Zokoll
authors.affiliation: b Department of Otolaryngology , Medical University of Hanover , Hanover , Germany.
authors.forename: Nina
authors.initials: N
authors.lastname: Wardenga
authors.affiliation: c Institute of Acoustics, Adam Mickiewicz University , Poznań , Poland.
authors.forename: Edward
authors.initials: E
authors.lastname: Ozimek
authors.affiliation: d St. Petersburg Pavlov State Medical University , St. Petersburg , Russia.
authors.forename: Maria
authors.initials: M
authors.lastname: Boboshko
authors.affiliation: a * Medizinische Physik and Cluster of Excellence Hearing4all, Carl-von-Ossietzky Universität Oldenburg , Oldenburg , Germany.|e HörTech gGmbH , Oldenburg , Germany.
authors.forename: Birger
authors.initials: B
authors.lastname: Kollmeier
mesh_terms: D000161:Acoustic Stimulation; D000162:Acoustics; D000328:Adult; D001309:Auditory Threshold; D032882:Comprehension; D064368:Healthy Volunteers; D006309:Hearing; D006801:Humans; D007802:Language; D009622:Noise / Q000009:adverse effects; D010470:Perceptual Masking; D011237:Predictive Value of Tests; D021641:Recognition, Psychology; D015203:Reproducibility of Results; D059629:Signal-To-Noise Ratio; D013065:Speech Intelligibility; D013067:Speech Perception; D013069:Speech Reception Threshold Test / Q000379:methods*; D055815:Young Adult
keywords: Russian speech audiometry; Speech perception; speech reception threshold; speech test