Factors associated with individual differences in clinical measures of speech recognition among the elderly.
In the present study, the speech-recognition performance of 50 subjects aged 63 to 83 years was measured for a wide range of materials (nonsense syllables, monosyllabic words, sentences) and listening conditions (presentation levels of 70 and 90 dB SPL, both in quiet and in a noise background). In addition to complete audiologic evaluations, measures of auditory processing (the Test of Basic Auditory Capabilities [TBAC], Watson, 1987) and cognitive function (Wechsler Adult Intelligence Scale-Revised [WAIS-R], and the Wechsler Memory Scale-Revised [WMS-R], Wechsler, 1981, 1987) were obtained from all subjects. Principal component analyses were applied to each of the three sets of measures (speech-recognition, auditory, and cognitive) prior to examining associations among the sets using canonical analyses. Two principal components captured most of the systematic variation in performance sampled by the set of 20 speech-recognition measures. Hearing loss emerged as the single largest factor associated with individual differences in speech-recognition performance among the elderly, accounting for 70-75% of the total variance in speech-recognition performance, with the measures of auditory processing and cognitive function accounting for little or no additional variance.
Department of Speech and Hearing Sciences, Indiana University, Bloomington.
L E
LE
Humes
B U
BU
Watson
L A
LA
Christensen
C G
CG
Cokely
D C
DC
Halling
L
L
Lee
D000161:Acoustic Stimulation; D000368:Aged; D006311:Hearing Disorders; D006801:Humans; D008875:Middle Aged; D009622:Noise / Q000009:adverse effects; D011304:Presbycusis; D013063:Speech Discrimination Tests; D013067:Speech Perception; D013647:Task Performance and Analysis