Equivalence of word test and consonant-vowel syllables test of dichotic listening

Relevance. Development and improvement of methodological tools to solve scientific and practical problems is an important issue in modern neuropsychology. This study examines consonant-vowel (СV) syllable test and word test, considers their different functional orientation and shows relevance of the dichotic listening task development. For the first time in Russian neuropsychology the authors developed the dichotic listening consonant-vowel syllables test taking into account the phonetic features of the Russian language.

Objective. Comparison of the equivalence of two dichotic listening tests: the word test that was first tested by B. S. Kotik and the two CV-syllable dichotic listening tests. 

Method. Two groups of respondents participated in the study. The first group of the participants (N = 88; M = 21.08; SD = 2.32) performed the word test and the first CV-syllable test. Participants of the second group (N = 44; M = 24.52; SD = 1.86) were presented with the word test and the second version of CV-syllable dichotic listening test. 

Results. The results confirmed the differences between the word test and the two CV-syllable dichotic listening tests. The differences and nonequivalence of the word test and the CV-syllable tests in laterality index (LI) and productivity coefficients (general productivity, right- and left-ear accuracy scores) are amplified as the stimulus material of CV-syllable dichotic listening is improved and modified. The increase of the load on working memory enhances right ear advantage (LI) and reduces performancewith an increase in the influence of working memory on the results of dichotic listening.

Conclusion. The study shows nonequivalence of the word test and the CV-syllable tests and their different functional orientation for the estimation of hemispheric specialization in audio-verbal domain.

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