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Abstract
The aim of this investigation was to observe basic variables which might be of significance for objective speech audiometry. Contrary to our former experiments, the near-threshold stimulation with indicative test words leads to contingent negative variation (CNVs) which are equal to or even smaller than the CNVs after supra-threshold stimulation. Thus the CNV can be used for objective testing of verbal discriminatory ability only as a qualitative, but not as a quantitative parameter.
Independent of whether the presentation was monaural or binaural, the distribution of CNV and the complementary waves were symmetrical over the two hemispheres. Selective concentration of attention on one ear produced particularly strong but symmetrical CNV. No evidence was found for a hemispheric predominance in either right-handed or left-handed persons; but it is still possible that predominance might occur in pathological conditions.
The CNV may be used very well as a qualitative test, e.g. in examining cases of aphasia, but not as a quantitative measurement like a speech audiometry.