An objective measurement of TMTF by using envelope of cABR
The temporal modulation transfer function (TMTF) has been proposed as a means for estimating temporal resolution. There are several problems that need to be overcome in the measurement of TMTF. For example, the threshold may be misjudged due to a lack of concentration by the measurement person as many judgment efforts are required, and the measurement task may be misunderstood due to limited language recognition ability. An appropriate objective measurement method is needed to avoid interference in the measurement process. We focused on cABR (auditory brainstem response to complex sounds) for objective measurement of TMTF because cABR faithfully represents several temporal acoustical features, including the envelope component of complex sound stimuli. The results for the temporal characteristic of cABR using SAM noise as complex sound stimuli can be used as an objective measurement of TMTF because the degree of cABR fluctuation was found to be related to the modulation depth of the stimuli and might be related to the modulation detection thresholds derived from TMTF.
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