Figure 3.

An example of the psychophysiological interactions term. (A) The seed time series were first deconvolved based on the estimated HRF to obtain physiological responses. (B) To combine both the physiological and psychophysical effects we multiplied the seed physiological series by the condition code from each condition separately. (C) The interaction at the physiological level was convolved with the estimated HRF, so we could compare this BOLD level interaction (as shown in D) with residual time series from other ROIs.