You are here: » Science Inventory This is an older EPA product. It may be available from EPA's National Service Center for Environmental Publications (NSCEP) and it should be available from the National Technical Information Service (NTIS). If the publication you seek is not found at either site, you may also wish to contact the NTIS Sales Desk (1-800-553-6847 or (703) 605-6000, 8 a.m. 6 p.m.; EST, Mon-Fri) to verify a title or order number for you. You may also e-mail your inquiry to them. Reference: SPEECH LEVELS IN VARIOUS NOISE ENVIRONMENTS (EPA600177025).
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Abstract The presence of cross-modal stochastic resonance in different noise environments has been proved in previous behavioral and event-related potential studies, while it was still unclear whether the gamma-band oscillation study was another evidence of cross-modal stochastic resonance. The multisensory gain of gamma-band activity between the audiovisual (AV) and auditory-only conditions in different noise environments was analyzed. Videos of face motion articulating words concordant with different levels of pink noise were used as stimuli. Signal-to-noise ratios (SNRs) of 0, −4, −8, −12 and −16 dB were selected to measure the speech recognition accuracy and EEG activity for 20 healthy subjects.
The power and phase of EEG gamma-band oscillations increased in a time window of 50–90 ms. The multisensory gains of evoked and total activity, as well as phase-locking factor, were greatest at the −12 dB SNR, which were consistent with the behavioral result. The multisensory gain of gamma-band activity showed an inverted U-shaped curve as a function of SNR. This finding confirmed the presence of cross-modal stochastic resonance. In addition, there was a significant correlation between evoked activity and phase-locking factor of gamma-band at five different SNRs.
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Rust pc game tpb mafia. Gamma-band oscillation was believed to play a role in the rapid processing and information linkage strengthening of AV modalities in the early stage of cognitive processes.