  We consider the Robin Hood dynamics, a one-dimensional extremal
self-organized critical model that describes the evolution of low-temperature
creep. One of the key quantities is the time evolution of the state variable
(force noise). To understand the temporal correlations, we compute the power
spectra of the local force fluctuations and apply finite-size scaling to get
scaling functions and critical exponents. We find a signature of the
$1/f^{\alpha}$ noise for the local force with a nontrivial value of the
spectral exponent $0< \alpha < 2$. We also examine temporal fluctuations in the
position of the extremal site and a local activity signal. We present results
for different local interaction rules of the model.
