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Two trains of light pulses at periods that are equally shifted from theharmonics of a missing fundamental, are combined in a nonlinear crystal. As aresult of a noncollinear phase matched second order nonlinear generation, a newtrain of pulses is obtained. When the temporal width of the input pulses islarge, the frequency of the resulting pulse train follows the observations fromclassical experiments on the perception of virtual pitch by the brain. On theother hand, when the width of the input pulses is small, the generated pulsetrain exhibits much lower frequencies, analogous to those observed in the motorneural system. Our experimental set up allows us to explore, systematically andcontinuously, the transition between these two regimes, while at the same timedemonstrate that coincidence detection in quadratic nonlinear systems hasfunctionalities similar to those observed in the nervous system.Comment: 4 pages, 6 figure

Coincidence detection of inharmonic pulses in a nonlinear crystal