ITD sensitivity can be measured via auditory-evoked potentials using sound-onset changes

Evidence

Direct measures of ITD sensitivity, attributed to multiple generator sites in the thalamus and auditory cortex (Picton et al. 1974 ; Hari et al. 1980 ; Näätänen and Picton 1987 ; Liégeois-Chauvel et al. 1994 ), have been demonstrated in auditory-evoked ‘P1-N1-P2’ responses, with abrupt changes in either the ITD (e.g. McEvoy 1991 ), or the interaural correlation of a noise (e.g. Chait et al. 2005 ), eliciting responses with typical latencies of 50, 100, and 175 ms, respectively. Although these studies demonstrate the capacity to assess binaural processing of interaural temporal information, they provide for only a relatively crude measure of ITD sensitivity, comparing, for example, EEG responses to diotic (identical) sounds at the two ears with responses to sounds that are statistically independent at the two ears. — Dijk, Pim van, Physiology, Psychoacoustics and…, 2953

Categorization

• DEFINE: Explains what diotic sounds are — identical input at both ears — key terminology for the hearing chapter.