The intensity functions which preserve constant loudness under conditions of interaural intensity asymmetry are plotted for pure tones, random noise, and triangular transient stimuli. For all stimuli, the constant loudness function is positively accelerated towards greater decrease per unit increase at the contralateral ear. The rate of acceleration is a function of the binaural summation ratio for each signal. The significance of these data in the design of lateralization studies is discussed.