  We present an analysis of the energy and frequency dependence of the Fourier
time lags of the hectoHertz quasi-periodic oscillations (QPOs) and of the QPOs
at the frequency at which the power density spectrum shows a break in the
neutron-star low-mass X-ray binary 4U 1636-53, using a large data set obtained
with the Rossi X-ray Timing Explorer. We found that: (i) For the break
frequency QPO: for low frequencies, in general the time lag is positive, but it
is decreasing with increasing frequency, reaching zero lag at 20 Hz. Between 20
and 35 Hz there is a small fluctuation around zero, from where the time lags
become positive again and increase slightly above zero up to 65 Hz. (ii) For
the hHz QPO: we see that when the frequency is 100 Hz the time lag is negative,
but it increases to zero already at 110 Hz, being consistent with this value up
to 130 Hz from where it increases to 0.5 msec at around 140 Hz. From 140 Hz the
time lag decreases sharply, being strongly negative for hHz greater than 220
Hz. We compare these lags with our previous results for the lags of the
kiloHertz QPOs in this same source and discuss possible scenarios for producing
the lags in this system in the context of reflection off the accretion disc or
(up-)down-scattering in a hot medium close to the neutron star.
