Spatial mapping of intracranial auditory events for various degrees of interaural coherence

The broadening and splitting of auditory events in dichotic listening conditions with various degrees of interaural coherence are discussed. By using a psychoacoustical mapping method, it has been possible to observe broadening and splitting for a wide range of stimuli, including broadband pink noise as well as bandpass noises with different relative bandwidths and center frequencies. The spatial extents of the auditory events decrease with increasing center frequencies for bandpass stimuli of constant relative bandwidth. The number of partial events for bandpass stimuli decreases with increasing degrees of interaural coherence. These results are, for example, of interest with respect to auditory spaciousness in architectural acoustics.