Learning what to ignore (attention again)

Humans learn to ignore stimuli that are not "important" to them. The ringing in my ears for example. In A.s.a. H. value/utility is typically a vector quantity. One component of this vector utility is a measure of how frequently A.s.a. sees that particular case reoccur. Another component of the vector utility measures how strongly that particular case is associated with "food," "reproduction," "pain," "health," or the like. Once A.s.a. H. has recorded a good number of similar cases it is possible to do a sensitivity analysis for each of the inputs to the cases in this cluster. One can identify any input that does not have a significant influence on the output (or next portion) of that case (or pattern sequence). One can then suppress the output from that case/cluster to the next level in the A.s.a. hierarchical memory as being common but unimportant. A given case ("stimuli") may turn out to be common but may not be important and once so identified can be ignored.