In the present study, only the amplitude and frequency modulation of calls was removed, but mean peak frequency remained unchanged, meaning that the 50-kHz sine wave tones used here had a peak frequency, which is typical for frequency-modulated calls.
The proposed ANN-based method can achieve good estimation accuracy of 97.2% and 96.9% by using the feature set {Peak, Mean, Peak Frequency, Kurtosis} and {Mean, Peak Frequency}.
It was then tried to predict the real and sham stimulation sessions based on the changes in the mean peak frequency difference (MPFD) observed in the brain of the patients in the 2 7 Hz frequency band.
Further inspection revealed the limitations of focusing on a single population measure (e.g., the mean peak frequency) to characterize age-related changes.
Due to inter-individual differences in the gamma peak frequency, the wavelet designed for the frequency of the subject's maximal amplitude in the gamma range was chosen (mean peak frequency range in the 150 400 ms interval: 51 Hz; std error±12.9 Hz).
The mean peak frequency was 23 ± 6 Hz.
Furthermore, they increased the consistency of mean peak frequency: they repeated syllable types with less variability when singing reactively.
Apart from the bio-duck sound, low-frequency downsweeps (n = 26) were the most frequently recorded sound on both tags, with a mean peak frequency of 83.1 ± 16.7 Hz, and a duration of 0.2 s (figure 2 d– f).
We measured the duration and the mean peak frequency (MPF) of elements using sound analysis software developed by R. Lachlan ("Luscinia," R. Lachlan, Leiden University, The Netherlands, http://luscinia.sourceforge.net).net
According to spectral analysis, the mean peak frequency in R2* time-courses was in the range inferior to 0.001 Hz (i.e.,<3.6 cycles h−1) for both tumour types.
