One limitation is the sample rate used where 100 Hz sample rates limit analyses to 10 ms resolution and therefore phase shift durations at shorter durations may be present but were missed. However, the time resolutions appears to be due more to physiology than the speed of computer measurement because we have measured phase shift and lock duration at sample rates of 512 Hz (1.95 ms resolution) and find the same minimum phase shift durations of about 20 ms as reported in this study. Mathematically the limiting relationship is between distance and time as described by Equation (1) that can be evaluated using the coefficients in Table 3. If d = 0 then duration = infinity. If d = infinity then duration = 0. The values between zero and infinity are a good fit of how packing density of neurons as a function of distance are related to PR duration. Higher sample rates should be used to further test the temporal synchrony limits as reported in this study. Another limitation are analyses only of the delta frequency band. Because of
