Understanding Auditory Spectro-Temporal Receptive Fields and Their Changes with Input Statistics by Efficient Coding Principles
Figure 7
The 2D STRFs/MTFs implied by efficient coding and found physiologically.
(A) input power (equation (15),
,
) in decorrelated channels. (B, C) MTF profile
and the corresponding STRFs with two SNRs (scaled by
's). (D)
and STRF as in B;C (when
) except with larger input correlations (
,
in equation (15)). (E;F) Modulation transfer functions (MTFs) and their properties at low and high input sound intensities averaged over 40 IC neurons from Lesica and Grothe [7]. Here,
is the spectral-temporal modulation frequency where the MTF peaks. Modulation frequencies in E and F are normalized by the same value across cells and intensities. Error bars in E indicate standard errors. The magnitude patterns of the MTFs for all neurons are normalized to peak value
. Their average across neurons at each input intensity is then normalized to the same peak value and displayed in F.