EVALUATION OF THE LIST OF NUMERALS IN THE DANISH SPEECH AUDIOMETRY MATERIAL - DANTALE

The psychometric function for the list of numerals in the Danish 'Dant ale' speech audiometry material was obtained by presenting the lists t o 30 normally hearing subjects at eight different sound pressure level s. Six of the subjects participated in a test of a possible learning e ffect. The psychometric function is presented, showing that 50% speech recognition is reached at a mean of 15 dB SPL, and that the slope of the function around the 50% value is 8.3% per dB. It was found that in no more than 7% of the cases was each numeral on the list confused wi th another numeral. A strong correlation between the recorded RMS valu e and the SRT for the individual numeral was found. The short-term lea rning effect was found to be negligible.