With a start, I realized that perhaps the reason for the 4 a.m. wake-up noise was not ordinary rudeness but carefully executed spite: I had not tipped Raoul in Christmases past.
It has been proved that structure of food chain, immigration and emigration, environment noise can influence the pattern of complex population dynamics.
Children experiencing an auditory function deficit can often find speech and communication very difficult to isolate and process when set against high levels of background noise.