Test-retest reliability of the South of England Cochlear Implant Centre (SOECIC) Music Test Battery (MTB): an investigation of two responses
University of Southampton, Institute of Sound and Vibration Research,
The South of England Cochlear Implant Centre (SOECIC) Music Test Battery (MTB) is a new battery of tests currently under development, designed for the assessment of cochlear implant (CI) users’ music perception in the clinic. The MTB consists of pitch discrimination, pitch identification and rhythm discrimination tests. This research project investigated the test-retest reliability of the SOECIC MTB and examined whether two different response methods influenced the test-retest reliability of the tests. Twenty normal hearing participants were recruited to complete the tests using both a three interval three alternative forced choice (3I3AFC) procedure and a three interval two alternative forced choice (3I2AFC) procedure. The test sessions were repeated on three separate occasions, in order to assess test-retest reliability. Eighteen of the twenty participants recruited completed all the test sessions and were included in the data analyses. It was hypothesised that the 3I2AFC procedure would produce more consistent results compared to the 3I3AFC procedure. This is because the presence of a reference tone (3I2AFC procedure) would assist the participant by providing a constant point by which to make a comparison. If the tests were reliable, then the participants’ scores would not change significantly when testing was repeated. A comparison of group means showed that scores did not statistically differ for the three test sessions for either response method, indicating that there was not an effect of time. Further statistical analyses showed moderate to strong correlations between the three test sessions when participants were using the 3I3AFC procedure. However, the correlations were weaker (some not statistically significant, p>0.05) between the test sessions when participants were using the 3I2AFC procedure. It was concluded that the SOECIC MTB demonstrated test-retest reliability when administered to a small sample of normal hearing listeners. The correlations between test sessions imply that the 3I3AFC procedure should be retained over the 3I2AFC procedure for future testing. It is proposed that further research should focus on investigating whether similar levels of test-retest reliability can be demonstrated when testing CI users.
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