Abstract
A detection law (the conditional detection rate. ) which corresponds to the model of Washburn's lateral range curve is presented in this paper. The detection law dealt, with here is a general one which includes the inverse cube law and the definite range law. The lateral range curve and the sweep width of this law are derived explicitly. Two met,hods for estimating the parameters of the law are presented and a set of actual data, is analyzed. Applying the model, we investigate the forestalling detection problem in a search-and-search situation. Taking account, of the forestalling detection by the target, the generalized formulas of the lateral range curve and the sweep width are derived.
