1. A method of determining spatial target probability using a model of multisensory processing by the brain, said method comprising the steps of: acquiring at least two inputs from a location in a desired environment where a first target is detected; applying said inputs to a plurality of model units in a map corresponding to a plurality of locations in said environment; approximating a posterior probability of said first target at each of said model units; finding a model unit with a highest posterior probability; choosing a location in said environment corresponding to said model unit with a highest posterior probability as a location of a next target.