  What is the reason for complex dynamical patterns registered from real
biological neuronal networks? Noise and dynamical reconfiguring of a network
(functional/dynamic connectome) were proposed as possible answers. In this case
study, we report a complex dynamical pattern observed in a simple deterministic
network of 25 neurons with fixed connectome. After a short initial stimulation,
the network is engaged into a complex dynamics, which lasts for a long time.
Eventually, with no external intervention, the dynamics comes to a periodic one
with a short period. The long transient is positively checked for being
chaotic. We conclude that the complex dynamics observed is the output of neural
computation performed in the process of neuronal firings and spikes
propagation.
