{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T22:42:28Z","timestamp":1785451348143,"version":"3.56.0"},"reference-count":59,"publisher":"American Physiological Society","issue":"6","funder":[{"name":"National Institute of Aging","award":["R01AG051603"],"award-info":[{"award-number":["R01AG051603"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Neurophysiology"],"published-print":{"date-parts":[[2018,12,1]]},"abstract":"<jats:p>The effects of aging and stimulus configuration on binaural masking level differences (BMLDs) were measured behaviorally and electrophysiologically, using the frequency-following response (FFR) to target brainstem\/midbrain encoding. The tests were performed in 15 younger normal-hearing (&lt;30 yr) and 15 older normal-hearing (&gt;60 yr) participants. The stimuli consisted of a 500-Hz target tone embedded in a narrowband (50-Hz bandwidth) or wideband (1,500-Hz bandwidth) noise masker. The interaural phase conditions included NoSo (tone and noise presented interaurally in-phase), NoS\u03c0 (noise presented interaurally in-phase and tone presented out-of-phase), and N\u03c0So (noise presented interaurally out-of-phase and tone presented in-phase) configurations. In the behavioral experiment, aging reduced the magnitude of the BMLD. The magnitude of the BMLD was smaller for the NoSo\u2013N\u03c0So threshold difference compared with the NoSo\u2013NoS\u03c0 threshold difference, and it was also smaller in narrowband compared with wideband conditions, consistent with previous measurements. In the electrophysiology experiment, older participants had reduced FFR magnitudes and smaller differences between configurations. There were significant changes in FFR magnitude between the NoSo to NoS\u03c0 configurations but not between the NoSo to N\u03c0So configurations. The age-related reduction in FFR magnitudes suggests a temporal processing deficit, but no correlation was found between FFR magnitudes and behavioral BMLDs. Therefore, independent mechanisms may be contributing to the behavioral and neural deficits. Specifically, older participants had higher behavioral thresholds than younger participants for the NoS\u03c0 and N\u03c0So configurations but had equivalent thresholds for the NoSo configuration. However, FFR magnitudes were reduced in older participants across all configurations.<\/jats:p><jats:p>NEW &amp; NOTEWORTHY Behavioral and electrophysiological testing reveal an aging effect for stimuli presented in wideband and narrowband noise conditions, such that behavioral binaural masking level differences and subcortical spectral magnitudes are reduced in older compared with younger participants. These deficits in binaural processing may limit the older participant's ability to use spatial cues to understand speech in environments containing competing sound sources.<\/jats:p>","DOI":"10.1152\/jn.00255.2018","type":"journal-article","created":{"date-parts":[[2018,9,19]],"date-time":"2018-09-19T18:45:16Z","timestamp":1537382716000},"page":"2939-2952","source":"Crossref","is-referenced-by-count":22,"title":["Age-related differences in binaural masking level differences: behavioral and electrophysiological evidence"],"prefix":"10.1152","volume":"120","author":[{"given":"Samira","family":"Anderson","sequence":"first","affiliation":[{"name":"Department of Hearing and Speech Sciences, University of Maryland College Park, Maryland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Ellis","sequence":"additional","affiliation":[{"name":"Department of Hearing and Speech Sciences, University of Maryland College Park, 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