title: Undirected head movements of listeners with asymmetrical hearing impairment during a speech-in-noise task.
abstract: It has long been understood that the level of a sound at the ear is dependent on head orientation, but the way in which listeners move their heads during listening has remained largely unstudied. Given the task of understanding a speech signal in the presence of a simultaneous noise, listeners could potentially use head orientation to either maximize the level of the signal in their better ear, or to maximize the signal-to-noise ratio in their better ear. To establish what head orientation strategy listeners use in a speech comprehension task, we used an infrared motion-tracking system to measure the head movements of 36 listeners with large (>16 dB) differences in hearing threshold between their left and right ears. We engaged listeners in a difficult task of understanding sentences presented at the same time as a spatially separated background noise. We found that they tended to orient their heads so as to maximize the level of the target sentence in their better ear, irrespective of the position of the background noise. This is not ideal orientation behavior from the perspective of maximizing the signal-to-noise ratio (SNR) at the ear, but is a simple, easily implemented strategy that is often effective in an environment where the spatial position of multiple noise sources may be difficult or impossible to determine.
authors.affiliation: MRC Institute of Hearing Research (Scottish Section), Glasgow Royal Infirmary, 16 Alexandra Parade, Glasgow G31 2ER, UK. owen@ihr.gla.ac.uk
authors.forename: W Owen
authors.initials: WO
authors.lastname: Brimijoin
authors.forename: David
authors.initials: D
authors.lastname: McShefferty
authors.forename: Michael A
authors.initials: MA
authors.lastname: Akeroyd
mesh_terms: D000161:Acoustic Stimulation; D000704:Analysis of Variance; D001301:Audiometry, Pure-Tone; D001302:Audiometry, Speech; D001309:Auditory Threshold; D007839:Functional Laterality; D019416:Head Movements; D006311:Hearing Disorders / Q000503:physiopathology* / Q000523:psychology*; D006801:Humans; D008875:Middle Aged; D009622:Noise / Q000009:adverse effects*; D010470:Perceptual Masking; D019986:Persons with Hearing Disabilities / Q000523:psychology*; D017603:Signal Detection, Psychological; D013067:Speech Perception
references.citation: J Acoust Soc Am. 1967 Aug;42(2):489-93
references.pmid: 6075942
references.citation: Br J Audiol. 1987 May;21(2):131-41
references.pmid: 3594015
references.citation: J Acoust Soc Am. 2010 Jun;127(6):3678-88
references.pmid: 20550266
references.citation: Audiology. 2001 May-Jun;40(3):148-57
references.pmid: 11465297
references.citation: J Neurophysiol. 1987 Sep;58(3):427-59
references.pmid: 3655876
references.citation: Exp Brain Res. 1992;92(1):152-64
references.pmid: 1486950
references.citation: J Acoust Soc Am. 2010 Jan;127(1):387-99
references.pmid: 20058985
references.citation: J Exp Psychol Hum Percept Perform. 1998 Aug;24(4):1232-42
references.pmid: 9706714
references.citation: Annu Rev Physiol. 1963;25:545-80
references.pmid: 13977960
references.citation: J Vestib Res. 1996 Jan-Feb;6(1):1-13
references.pmid: 8719504
references.citation: Child Dev. 1979 Jun;50(2):431-6
references.pmid: 487883
references.citation: J Acoust Soc Am. 2001 May;109(5 Pt 1):2272-5
references.pmid: 11386581
references.citation: J Acoust Soc Am. 2005 Apr;117(4 Pt 1):2181-92
references.pmid: 15898659
references.citation: J Speech Lang Hear Res. 2009 Oct;52(5):1241-54
references.pmid: 19564437
references.citation: Cognition. 2004 Sep;93(2):B69-78
references.pmid: 15147940
references.citation: J Acoust Soc Am. 1999 May;105(5):2841-53
references.pmid: 10335634
references.citation: Acta Psychol (Amst). 1967;26(1):22-63
references.pmid: 6043092
references.citation: Hum Factors. 2005 Spring;47(1):188-98
references.pmid: 15960096
references.citation: J Speech Hear Res. 1969 Jun;12(2):423-5
references.pmid: 5808871