Auditory localization of nearby sources. II. Localization of a broadband source.

Although many researchers have examined auditory localization for relatively distant sound sources, little is known about the spatial perception of nearby sources. In the region within 1 m of a listener's head, defined as the "proximal region," the interaural level difference increases dramatically as the source approaches the head, while the interaural time delay is roughly independent of distance. An experiment has been performed to evaluate proximal-region localization performance. An auditory point source was moved to a random position within 1 m of the subject's head, and the subject responded by pointing to the perceived location of the sound with an electromagnetic position sensor. The overall angular error (17 degrees) was roughly comparable to previously measured results in distal-region experiments. Azimuth error increased slightly as the sound source approached the head, but elevation performance was essentially independent of source distance. Distance localization performance was generally better than has been reported in distal-region experiments and was strongly dependent on azimuth, with the stimulus-response correlation ranging from 0.85 to the side of the head to less than 0.4 in the median plane. The results suggest that the enlarged binaural difference cues found in the head-related transfer function (HRTF) for nearby sources are important to auditory distance perception in the proximal region.

[1]  A. D. Little,et al.  Spectral Content as a Cue to Perceived Auditory Distance , 1992, Perception.

[2]  N I Durlach,et al.  Evaluation of response methods for the localization of nearby objects , 2000, Perception & psychophysics.

[3]  L. Rayleigh,et al.  XII. On our perception of sound direction , 1907 .

[4]  G. W. Stewart.  The Acoustic Shadow of a Rigid Sphere, with Certain Applications in Architectural Acoustics and Audition , 1911 .

[5]  W. M. Rabinowitz,et al.  Auditory localization of nearby sources. Head-related transfer functions. , 1999, The Journal of the Acoustical Society of America.

[6]  G. W. Stewart.  Phase Relations in the Acoustic Shadow of A Rigid Sphere; Phase Difference at the Ears , 1914 .

[7]  D H Mershon,et al.  Absolute and Relative Cues for the Auditory Perception of Egocentric Distance , 1979, Perception.

[8]  R. Duda,et al.  Range dependence of the response of a spherical head model , 1998 .

[9]  A D Musicant,et al.  The influence of pinnae-based spectral cues on sound localization. , 1984, The Journal of the Acoustical Society of America.

[10]  D. M. Green,et al.  Sound localization by human listeners. , 1991, Annual review of psychology.

[11]  Douglas S. Brungart,et al.  Auditory localization in the near-field , 1996 .

[12]  Simon R. Oldfield,et al.  Acuity of Sound Localisation: A Topography of Auditory Space. I. Normal Hearing Conditions , 1984, Perception.

[13]  Jay L. Devore,et al.  Probability and statistics for engineering and the sciences , 1982 .

[14]  F L Wightman,et al.  Headphone simulation of free-field listening. I: Stimulus synthesis. , 1989, The Journal of the Acoustical Society of America.

[15]  J. C. Middlebrooks,et al.  Two-dimensional sound localization by human listeners. , 1990, The Journal of the Acoustical Society of America.

[16]  N I Durlach,et al.  Range effects in the identification of lateral position. , 1989, The Journal of the Acoustical Society of America.

[17]  R. Butler,et al.  Estimation of distances of recorded sounds presented through headphones. , 1979, Scandinavian audiology.

[18]  W E Simpson,et al.  Head movement does not facilitate perception of the distance of a source of sound. , 1973, The American journal of psychology.

[19]  N I Durlach,et al.  Intensity perception. I. Preliminary theory of intensity resolution. , 1969, The Journal of the Acoustical Society of America.

[20]  F. Wightman,et al.  The dominant role of low-frequency interaural time differences in sound localization. , 1992, The Journal of the Acoustical Society of America.

[21]  John C. Middlebrooks,et al.  Monaural sound localization: Acute versus chronic unilateral impairment , 1994, Hearing Research.

[22]  S. Perrett,et al.  The effect of head rotations on vertical plane sound localization. , 1997, The Journal of the Acoustical Society of America.

[23]  Mark B. Gardner,et al.  Distance Estimation of 0° or Apparent 0°‐Oriented Speech Signals in Anechoic Space , 1969 .

[24]  R. V. L. Hartley,et al.  The Binaural Location of Pure Tones. , 1921 .

[25]  R. Butler,et al.  Factors that influence the localization of sound in the vertical plane. , 1968, The Journal of the Acoustical Society of America.

[26]  W. Thurlow,et al.  Subject orientation and judgment of distance of a sound source. , 1969, The Journal of the Acoustical Society of America.

[27]  D. Mershon,et al.  Intensity and reverberation as factors in the auditory perception of egocentric distance , 1975 .

[28]  Simon R. Oldfield,et al.  Acuity of Sound Localisation: A Topography of Auditory Space. III. Monaural Hearing Conditions , 1986, Perception.

[29]  W. D. Neff,et al.  Apparent distance of sounds recorded in echoic and anechoic chambers. , 1980, Journal of experimental psychology. Human perception and performance.

[30]  Daniel H. Ashmead,et al.  Perception of the relative distances of nearby sound sources , 1990, Perception & psychophysics.

[31]  P. Coleman.  An analysis of cues to auditory depth perception in free space. , 1963, Psychological bulletin.