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[The application of the same frequency tone masking test in forensic identification]
Ji-hui Liu1, Jing-tao Xu, Yu-fei Li
1Department of Clinical Forensic Medicine, Faculty of Forensic Medicine, China Medical University, Shenyang 110001, China. liujihui585@hotmail.com
Objective:
To investigate the relationship between minimum contralateral masking level (MCML) and pure tone threshold of the masking ears by the same frequency tone masking test.
Methods:
The pure tone thresholds of 30 subjects (60 ears) were measured by pure tone audiometry and MCML was obtained by means of the same frequency tone masking test.
Results:
When the stimulus was at the threshold of masked ears, the differences between MCML and pure tone threshold of masking ears were among 0-30 dBHL. 82.4 percent of results showed the differences not higher than 10 dBHL, 97.1 percent of results showed the differences not higher than 15 dBHL. When the stimulus was at 10 dBHL above the threshold of masked ears, the differences between MCML and pure tone threshold of masking ears were among 0-35 dBHL. 90.5 percent of results showed the differences not higher than 25 dBHL, 98.1 percent of results showed the differences not higher than 30 dBHL.
Conclusion:
The real thresholds can be deduced correctly by the same frequency tone masking test.
