Figure 1.
Stimuli and training paradigm. (a): Time series of the syllable ‘Maat’ and the concurrent noise show the temporal relationships between stimuli and noise. The spectrogram of the syllable sound illustrates the distinct spectral patterns during the syllable onset, the vowel, and the coda. (b): Time series and spectrogram for the syllable ‘Maash’ show the different spectral pattern of the coda compared to ‘Maat’ (c): Power spectrum of the speech-like filtered Gaussian noise. (d): Flow chart of one trial of the training procedure. The example shown is from a coda syllable set. Participants had the options to request a stimulus repetition or selected the written syllable best matching with the sound stimulus. Visual feedback was provided and the SNR for the next trial was adjusted according to the participant’s response.