  We present a new type of deterministic dynamical behaviour that is less
predictable than white noise. We call it anti-deterministic (AD) because time
series corresponding to the dynamics of such systems do not generate
deterministic lines in Recurrence Plots for small thresholds. We show that
although the dynamics is chaotic in the sense of exponential divergence of
nearby initial conditions and although some properties of AD data are similar
to white noise, the AD dynamics is in fact less predictable than noise and
hence is different from pseudo-random number generators.
