Fig. 2

Aggregated feature coefficients across the three different binary classification conditions. In general, positive values correspond to the less-impaired group having higher values. Stronger weights are indicated by either darker orange (positive weights) or darker blue (negative weights) cell colours, and weights are additionally annotated. Feature names are indicated on the vertical axis. ac autocorrelation, apq amplitude perturbation quotient (3, 5, and 11-point cases), cc cross-correlation, ct count, db decibels, dda average absolute difference in amplitudes between periods, ddp difference of difference of periods, dur duration, Fo fundamental frequency, HNR harmonic/noise ratio, int intensity, max maximum, med medium, min minimum, norm normalized, ppq5 5-point pitch perturbation quotient, rap relative average perturbation, var variance, Zcr zero-crossing rate