In relation to object representation by neurons in area TE, we have examined synchronization of firing of TE neurons (Uchida, et al. SFN, 2002.). We showed that in 44% (25/57) of TE neuron pairs, a symmetrical broad peak (mean half peak width~125ms) appears in cross-correlogram of spike trains at 0 time delay. In this study, to explore origin of the broad peak, for each of the 25 neuron pairs we calculated auto-correlograms of the constituent neurons and directly compared them with cross-correlogram of the neurons. In 52% (13/25) of the neuron pairs, auto-correlograms of the constituent neurons consisted of a sharp peak at the center (0 time delay) and a gradual decay component from the center (For the rest of the pairs (n=12), one of the constituent neurons only had the sharp peak at the center). A regression analysis of the auto-correlograms revealed that this decay component is well fitted with an exponential function (time constant~120ms). This result is consistent with the model that a TE neuron takes...