In a good concert hall, a big orchestra can evoke remarkably spacious sounds. The concertgoer is surrounded by the physical sound waves, and out of these waves the subjective sound impressions are created in the listener s head. This biological measuring device organized itself during childhood. With no special effort and quite continuously it performs parallel data proce- ing and makes no distinction between complex or simple analysis. Imagine that the orchestra, after complete silence, strikes a load, abrupt chord. In that moment we can watch the immediate response of the hall. The...