The ability to segregate simultaneous sound sources based on their spatial locations is an important aspect of auditory scene analysis. While the role of sound azimuth in segregation is well studied, the contribution of sound elevation remains unknown. Although previous studies in humans suggest that elevation cues alone are not sufficient to segregate simultaneous broadband sources, the current study demonstrates they can suffice. Listeners segregating a temporally modulated noise target from a simultaneous unmodulated noise distracter differing in elevation fall into two statistically distinct groups: one that identifies target direction accurately across a wide range of modulation frequencies (MF) and one that cannot identify target direction accurately and, on average, reports the opposite direction of the target for low MF. A non-spiking model of inferior colliculus neurons that process single-source elevation cues suggests that the performance of both listener groups at the population level can be accounted for by the balance of excitatory and inhibitory inputs in the model. These results establish the potential for broadband elevation cues to contribute to the computations underlying sound source segregation and suggest a potential mechanism underlying this contribution.
References
1.
Aitkin
, L.
, and Martin
, R.
(1990
). “Neurons in the inferior colliculus of cats sensitive to sound-source elevation
,” Hear. Res.
50
, 97
–106
.2.
Asano
, F.
, Suzuki
, Y.
, and Sone
, T.
(1990
). “Role of spectral cues in median plane localization
,” J. Acoust. Soc. Am.
88
, 159
–168
.3.
Bacon
, S. P.
, Opie
, J. M.
, and Montoya
, D. Y.
(1998
). “The effects of hearing loss and noise masking on the masking release for speech in temporally complex backgrounds
,” J. Speech. Lang. Hear. Res.
41
, 549
–563
.4.
Best
, V.
, van Schaik
, A.
, and Carlile
, S.
(2004
). “Separation of concurrent broadband sound sources by human listeners
,” J. Acoust. Soc. Am.
115
, 324
–336
.5.
Bizley
, J. K.
, Nodal
, F. R.
, Parsons
, C. H.
, and King
, A. J.
(2007
). “Role of auditory cortex in sound localization in the midsagittal plane
,” J. Neurophysiol.
98
, 1763
–1774
.6.
Bregman
, A. S.
(1990
). Auditory Scene Analysis: The Perceptual Organization of Sound
(MIT Press
, Cambridge, MA
), Chap. 3, pp. 213
–394
.7.
Bremen
, P.
, van Wanrooij
, M. M.
, and van Opstal
, A. J.
(2010
). “Pinna cues determine orienting response modes to synchronous sounds in elevation
,” J. Neurosci.
30
, 194
–204
.8.
Cherry
, E. C.
(1953
). “Some experiments on the recognition of speech, with one and two ears
,” J. Acoust. Soc. Am.
25
, 975
–979
.9.
Davis
, K. A.
, Ramachandran
, R.
, and May
, B. J.
(2003
). “Auditory processing of spectral cues for sound localization in the inferior colliculus
,” J. Assoc. Res. Otolaryngol.
4
, 148
–163
.10.
Festen
, J. M.
, and Plomp
, R.
(1990
). “Effects of fluctuating noise and interfering speech on the speech-reception threshold for impaired and normal hearing
,” J. Acoust. Soc. Am.
88
, 1725
–1736
.11.
Gai
, Y.
, Ruhland
, J. L.
, Yin
, T. C. T.
, and Tollin
, D. J.
(2013
). “Behavioral and modeling studies of sound localization in cats: Effects of stimulus level and duration
,” J. Neurophysiol.
110
, 607
–620
.12.
Gustafsson
, H. A.
, and Arlinger
, S. D.
(1994
). “Masking of speech by amplitude-modulated noise
,” J. Acoust. Soc. Am.
95
, 518
–529
.13.
Hebrank
, J.
, and Wright
, D.
(1974
). “Spectral cues used in the localization of sound sources on the median plane
,” J. Acoust. Soc. Am.
56
, 1829
–1834
.14.
Hill
, K. T.
, and Miller
, L. M.
(2010
). “Auditory attentional control and selection during cocktail party listening
,” Cereb. Cortex
20
, 583
–590
.15.
Hofman
, P. M.
, and van Opstal
, A. J.
(1998
). “Spectro-temporal factors in two-dimensional human sound localization
,” J. Acoust. Soc. Am.
103
, 2634
–2648
.16.
Hofman
, P. M.
, and van Opstal
, A. J.
(2003
). “Binaural weighting of pinna cues in human sound localization
,” Exp. Brain Res.
148
, 458
–470
.17.
Hofman
, P. M.
, van Riswick
, J. G. A.
, and van Opstal
, A. J.
(1998
). “Relearning sound localization with new ears
,” Nat. Neurosci.
1
, 417
–421
.18.
May
, B. J.
, Anderson
, M.
, and Roos
, M.
(2008
). “The role of broadband inhibition in the rate representation of spectral cues for sound localization in the inferior colliculus
,” Hear. Res.
238
, 77
–83
.19.
Middlebrooks
, J. C.
, and Green
, D. M.
(1991
). “Sound localization by human listeners
,” Annu. Rev. Psychol.
42
, 135
–159
.20.
Nelken
, I.
, and Young
, E. D.
(1994
). “Two separate inhibitory mechanisms shape the responses of dorsal cochlear nucleus type IV units to narrowband and wideband stimuli
,” J. Neurophysiol.
71
, 2446
–2462
.21.
O'Connor
, K. N.
, Johnson
, J. S.
, Niwa
, M.
, Noriega
, N. C.
, Marshall
, E. A.
, and Sutter
, M. L.
(2011
). “Amplitude modulation detection as a function of modulation frequency and stimulus duration: Comparisons between macaques and humans
,” Hear. Res.
277
, 37
–43
.22.
O'Connor
, K. N.
, and Sutter
, M. L.
(2000
). “Global spectral and location effects in auditory perceptual grouping
,” J. Cogn. Neurosci.
12
, 342
–354
.23.
Reiss
, L. A. J.
, and Young
, E. D.
(2005
). “Spectral edge sensitivity in neural circuits of the dorsal cochlear nucleus
,” J. Neurosci.
25
, 3680
–3691
.24.
Roffler
, S. K.
, and Butler
, R. A.
(1968
). “Factors that influence the localization of sound in the vertical plane
,” J. Acoust. Soc. Am.
43
, 1255
–1259
.25.
Shinn-Cunningham
, B. G.
, Lee
, A. K. C.
, and Oxenham
, A. J.
(2007
). “A sound element gets lost in perceptual competition
,” Proc. Natl. Acad. Sci. U.S.A.
104
, 12223
–12227
.26.
Tollin
, D. J.
, and Yin
, T. C. T.
(2003
). “Spectral cues explain illusory elevation effects with stereo sounds in cats
,” J. Neurophysiol.
90
, 525
–530
.27.
van Wanrooij
, M. M.
, and van Opstal
, A. J. V.
(2007
). “Sound localization under perturbed binaural hearing
,” J. Neurophysiol.
97
, 715
–726
.28.
Vélez
, A.
, and Bee
, M. A.
(2011
). “Dip listening and the cocktail party problem in grey treefrogs: Signal recognition in temporally fluctuating noise
,” Anim. Behav.
82
, 1319
–1327
.29.
Woods
, D. L.
, Alain
, C.
, Diaz
, R.
, Rhodes
, D.
, and Ogawa
, K. H.
(2001
). “Location and frequency cues in auditory selective attention
,” J. Exp. Psychol. Hum. Percept. Perform.
27
, 65
–74
.30.
Yost
, W. A.
, and Brown
, C. A.
(2013
). “Localizing the sources of two independent noises: Role of time varying amplitude differences
,” J. Acoust. Soc. Am.
133
, 2301
–2313
.31.
Young
, E. D.
, Spirou
, G. A.
, Rice
, J. J.
, Voigt
, H. F.
, and Rees
, A.
(1992
). “Neural organization and responses to complex stimuli in the dorsal cochlear nucleus
,” Philos. Trans. R. Soc. London B
336
, 407
–413
.32.
Zwiers
, M. P.
, Versnel
, H.
, and van Opstal
, A. J.
(2004
). “Involvement of monkey inferior colliculus in spatial hearing
,” J. Neurosci.
24
, 4145
–4156
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2015
Acoustical Society of America
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