Fig. (5) (a) The 1st order kernel estimates based on the best linear models using Laguerre expansions: average waveform and standarddeviation bounds for the 12 subjects (top left panel) and illustrative kernels from 3 subjects (top right panel). (b) The apparent Gain Functions (Fourier Transform magnitude of the 1st order kernels) based on the best linear models using Laguerre expansions: average waveform and standard-deviation bounds for the 12 subjects (bottom left panel) and illustrative apparent Gain Functions from 3 subjects (bottom right panel).