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Poster. Sounds recorded using a binaural head are analysed to find the azimuthal direction of a sound source. Two techniques for interaural intensity difference (IID) estimation are compared. In both, signals were filtered into a number of wideband logarithmically spaced frequency bands. In method 1, an estimate of the IID in each frequency band was made every 20ms, and in method 2, estimates were made only when a cluster of onsets had been found. Onsets were detected using a biologically plausible spike-based technique. IID vectors were converted to directions using estimates of the impulse response of the binaural head. The onset-based technique provides better results, particularly in reverberant environments.