Phase coherence of the middle-latency response in the elderly.
We compared phase coherence of the auditory-evoked, middle-latency response (MLR) and the 40-Hz steady-state evoked potential (SSEP) in two groups of elderly listeners, matched for degree of audiometric hearing sensitivity loss. In group A, speech understanding was appropriate to the degree of audiometric sensitivity loss. In group B, speech understanding was disproportionately poor in relation to the degree of loss. In both modes of measurement (MLR and SSEP) phase coherence was significantly poorer in group B than in group A. In the case of MLR, maximum phase coherence was observed at the expected 40 Hz in group A, but at 30 Hz in group B. In the case of SSEP, maximum phase coherence was observed at 40 Hz in both groups but was poorer at almost all Fourier components in group B.
Ali
A A
AA
Division of Audiology and Speech Pathology, Baylor College of Medicine, Houston, Texas.
Jerger
J
J
D000161:Acoustic Stimulation; D000367:Age Factors; D000368:Aged; D001309:Auditory Threshold; D005072:Evoked Potentials, Auditory; D005260:Female; D005583:Fourier Analysis; D006311:Hearing Disorders / Q000175:diagnosis*; D006801:Humans; D008297:Male; D013063:Speech Discrimination Tests; D013067:Speech Perception