Fig. 6. An example of multisensory enhancement where the unisensory responses are marginal but the multisensory responses are evident. A and C are baseline-subtracted spike density function (SDFs) during each stimulus type. B and D compare the calculated linear sum of the baseline-subtracted unisensory responses to the actual baseline-subtracted multisensory response. In each graph, the vertical broken arrow is the time of the minimum object distance.