Assessment of auditory temporal-order thresholds - a comparison of different measurement procedures and the influences of age and gender.
OBJECTIVE
The relationship between auditory temporal-order perception and phoneme discrimination has been discussed for several years, based on findings, showing that patients with cerebral damage in the left hemisphere and aphasia, as well as children with specific language impairments, show deficits in temporal-processing and phoneme discrimination. Over the last years several temporal-order measurement procedures and training batteries have been developed. However, there exists no standard diagnostic tool for adults that could be applied to patients with aphasia. Therefore, our study aimed at identifying a feasible, reliable and efficient measurement procedure to test for auditory-temporal processing in healthy young and elderly adults, which in a further step can be applied to patients with aphasia.


METHODS
The tasks varied according to adaptive procedures (staircase vs. maximum-likelihood), stimuli (tones vs. clicks) and stimulation modes (binaural- vs. alternating monaural) respectively. A phoneme-discrimination task was also employed to assess the relationship between temporal and language processing.


RESULTS
The results show that auditory temporal-order thresholds are stimulus dependent, age related, and influenced by gender. Furthermore, the cited relationship between temporal-order threshold and phoneme discrimination can only be confirmed for measurements with pairs of tones.


CONCLUSIONS
Our results indicate, that different norms have to be established for different gender and age groups. Furthermore, temporal-order measurements with tones seem to be more suitable for clinical intervention studies than measurements with clicks, as they show higher re-test reliabilities, and only for measurements with tones an association with phoneme-discrimination abilities was found.
Generation Research Program, Human Science Center, Ludwig-Maximilian University of Munich, Prof.-Max-Lange-Platz 11, 83646 Bad Tölz, Germany. fink@grp.hwz.uni-muenchen.de
Martina
M
Fink
Jan
J
Churan
Marc
M
Wittmann
D000161:Acoustic Stimulation / Q000379:methods; D000368:Aged; D000375:Aging / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D001309:Auditory Threshold / Q000502:physiology*; D004192:Discrimination, Psychological; D005260:Female; D006801:Humans; D016013:Likelihood Functions; D008297:Male; D008875:Middle Aged; D011601:Psychophysics / Q000379:methods; D015203:Reproducibility of Results; D012727:Sex Characteristics; D013063:Speech Discrimination Tests; D018709:Statistics, Nonparametric; D013998:Time Perception / Q000502:physiology*