On the Stability of Auditory Threshold,
NATIONAL PHYSICAL LAB TEDDINGTON (ENGLAND)
Pagination or Media Count:
Using audiometrically-experienced well-motivated subjects it is shown that the total replication variance for threshold tests repeated within a period of 27 months is of order 3 sq db at 1 kHz, rising to 15 sq db at 80 Hz and to 30 sq db at 12 kHz in this respect little differences was observed between manual and self-recording techniques. The component of this due to true long-term changes is of order 1-2 sq db. Even with experienced subjects the mean hearing level on any given day improved by about 1 dB on second and subsequent tests, whilst inexperienced subjects showed additional improvements due to familiarisation varying from 1 to 9 dB.
- Anatomy and Physiology