ASSR: 95% or 99% Statistical Confidence?

10 mins
16 December 2021


Reaching the 99% value will allow you to be more certain that you have reached the correct answer, when you see an ASSR recorded at a particular level with a particular stimulus. To reach a higher degree of certainty requires more time – this is the time needed to acquire more data i.e. keep averaging to reduce the residual noise and increase the signal-to-noise ratio.

One of the key advantages of ASSR is the statistical approach to interpration of the data, removing tester bias. However, statistics themselves are at risk of error and the 99% value minimises this risk. However, most people would agree that even a 95% certainty regarding the response is still high, and this criteria will be met in a shorter period of time.


Michael Maslin
After working for several years as an audiologist in the UK, Michael completed his Ph.D. in 2010 at The University of Manchester. The topic was plasticity of the human binaural auditory system. He then completed a 3-year post-doctoral research program that built directly on the underpinning work carried out during his Ph.D. In 2015, Michael joined the Interacoustics Academy, offering training and education in audiological and vestibular diagnostics worldwide. Michael now works for the University of Canterbury in Christchurch, New Zealand, exploring his research interests which include electrophysiological measurement of the central auditory system, and the development of clinical protocols and clinical techniques applied in areas such as paediatric audiology and vestibular assessment and management.

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