Beyond speech intelligibility testing: A memory test for assessment of signal processing interventions in ecologically valid listening situations
2013 (English)Conference paper, Abstract (Other academic)
Performance of hearing aid signal processing is often assessed by speech intelligibility in noise tests, such as the HINT, CRM, or SPIN sentences presented in a background of noise or babble. Usually these tests are most sensitive at a signal-to-noise ratio (SNR) below 0 dB. However, in a recent study by Smeds et al. (2012) it was shown that the SNRs in ecological listening situations (e.g. kitchen, babble, and car) were typically well above 0 dB SNR. That is, SNRs where the speech intelligibility in noise tests are insensitive.Cognitive Spare Capacity (CSC) refers to the residual capacity after successful speech perception. In a recent study by Ng et al. (2010), we defined the residual capacity to be number of words recalled after successful listening to a number of HINT sentences, inspired by Sarampalis et al. (2009).In a recent test with 26 hearing impaired test subjects we showed that close to 100% correct speech intelligibility in a four talker babble noise required around + 7 dB SNR. At that SNR it was shown that a hearing aid noise reduction scheme improved memory recall by about 10-15%. Thus, this kind of memory recall test is a possible candidate for assessment of hearing aid functionality in ecologically relevant (positive) SNRs.
Place, publisher, year, edition, pages
2013. 62-62 p.
IdentifiersURN: urn:nbn:se:liu:diva-103052OAI: oai:DiVA.org:liu-103052DiVA: diva2:686439
Second International Conference on Cognitive Hearing Science for Communication, Linköping University, Sweden, June 16-19, 2013