To evaluate all aspects of binaural signal processing algorithms, an objective measure of how they affect spatial perception is required. We are developing such a measure using a data-driven approach based on virtual acoustics and models of binaural signal processing of the auditory system. We present a brief overview of the methods and models that we use to study spatial perception. We discuss the binaural cues of realistic signals in more detail, and demonstrate the importance of interaural coherence as a binaural cue. We conclude with an outlook on our future work.