Temporal distributions of simultaneous response rates and approximate curves in each cross-modal combination.

<p>We calculated actual stimulus onset asynchrony (SOA) values, using a record of real-time monitoring of stimulus presentation. The actual SOA values were classified into 27 time windows, and the simultaneous response rates were calculated for every time window in each cross-modal combination. Temporal distributions of simultaneous response rates (filled circular dots) and approximate curves (solid line) for olfactory–visual, visual–gustatory, and olfactory–gustatory combinations are shown in (a), (b), and (c), respectively. We assumed that the temporal distributions of simultaneous response rates were Gaussian, and calculated approximations by the least-squares method. The error rates of approximations for olfactory–visual, visual–gustatory, and olfactory–gustatory combinations were 0.4%, 0.1%, and 0.3%, respectively.