Analysis of the filter behavior.

<p>Filter characteristics of the population code (red circle) and its best match with the Gabor function (gray circle) according to Eq. 2. The bandwidth (A) was quantified at -3 dB of the power spectrum maximum amplitude. The quality factor or sharpness (B) represents the ratio between the center frequency and bandwidth of the filters. The damping ratio (C) is a measure based on the quality factor and shows that the filters characteristics have underdamped () proprieties. The width of each filter temporal envelope (D) was measured at 3 dB below the peak of the energy power using the Hilbert transform.</p>