Figure 1. Overview of model.
(A) The distribution of best delay vs best frequency for cells in the guinea pig model (left), with the physiological range of ITDs shown in gray, and a sample tuning curve (right). (B) Illustration of the model: a sound source is filtered via position-dependent HRTFs to give left and right channels. For each best frequency on each channel, the signal undergoes cochlear filtering using gammatone filters. An internal delay is added, and the two channels are combined and sent to a binaural neuron model that produces Poisson distributed spikes. (C) The response of the cells to sounds at two different ITDs (rows) for white noise (left column) and a natural sound (right column). The ITD is indicated by the black dashed line. Each cell is surrounded by a disc with a color indicating the response of that neuron (hot colors corresponding to strong responses). When two or more discs overlap, each point is colored according to the closest cell. The strongest responses lie along the line of the ITD.