p071fig02.15 The noise saturation dilemma: How do neurons retain their sensitivity to the relative sizes of input patterns whose total sizes can change greatly through time?<BR>||  Noise-Saturation Dilemma (Grossberg 1968-1973). Bounded activities from multiple input sources.<BR>If activities xi are sensitive to SMALL inputs, then why don't the saturate to large outputs?<BR>If xi are sensitive to LARGE inputs, then why don't small inputs get lost in system noise?<BR>The functional unit is a spatial activity pattern .