Figure 1. MCD model.

(a) Schematic representation of the model. The MCD integrates multisensory signals (S_V(t), S_A(t)) through a set of low-pass temporal filters followed by linear operations. The MCD model yields two outputs, MCD_Corr(t) (equation 4) and MCD_Lag(t) (equation 5), representing, respectively, the temporal correlation and lag across the input signals. (b) Time-averaged impulse response function of the MCD. The y axis represents the response of the model to visual and auditory impulses as a function of the lag across the senses (see inset). Blue line and axis represent the time-averaged response of the correlation detector (, equation 6), red line and axis represent the time-averaged response of the lag detector (, equation 7). Note how the correlation detector output (blue) peaks at low lags, whereas the output of the lag detector (red) changes sign depending on which modality comes first.