Abstract：
OBJECTIVE:Recent studies have shown that the frequency-following response (FFR) to voice pitch can be a useful method to evaluate the signal-processing mechanisms and neural plasticity in the human brainstem. The purpose of this study was to examine the quantitative properties of the FFR trends with an exponential curve-fitting model. DESIGN:FFR trends obtained with increasing number of sweeps (up to 8000 sweeps) at three stimulus intensities (30, 45, and 60 dB nHL) were fit to an exponential model that consisted of estimates of background noise amplitude, asymptotic response amplitude, and a time constant. Five objective indices (Frequency Error, Slope Error, Tracking Accuracy, Pitch Strength and RMS Ratio) were used to represent different perspectives of pitch processing in the human brainstem. STUDY SAMPLE:Twenty-three native speakers (16 males; age = 24.7 ± 2.1 years) of Mandarin Chinese were recruited. RESULTS:The results demonstrated that the exponential model provided a good fit (r(2) = 0.89 ± 0.10) to the FFR trends with increasing number of sweeps for the five objective indices. CONCLUSIONS:The exponential model, combined with the five objective indices, can be used for difficult-to-test patients and may prove to be useful as an assessment and diagnostic method in both clinical and basic research efforts.
journal_name
Int J Audioljournal_title
International journal of audiologyauthors
Jeng FC,Chung HK,Lin CD,Dickman B,Hu Jdoi
10.3109/14992027.2011.582164subject
Has Abstractpub_date
2011-09-01 00:00:00pages
582-93issue
9eissn
1499-2027issn
1708-8186journal_volume
50pub_type
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