The connection of hemispheric activity in the field of audioverbal perception and the progressive lateralization of speech and motor processes

Kovyazina, M.S.; Khokhlov, N.A.; Morozova, N.V.

Авторы: Kovyazina M.S., Khokhlov N.A., Morozova N.V.
Журнал: Psychology in Russia: State of the Art
Том: 8
Номер: 4
Год издания: 2015
Первая страница: 72
Последняя страница: 82
DOI: 10.11621/pir.2015.0406
Аннотация: In this paper there is a question discussed about the connection of the hemispheric control over audioverbal perception processes upon such an individual feature as “a leading hand" (right-handedness and left-handedness). There are literature review and author’s research presented to evidence the complexity and ambiguity of this question. The method of dichotic listening is used for diagnosing audioverbal perception lateralization. This allows of estimating the right ear coefficient (REC), efficiency coefficient (EC) and effectiveness ratio (ER) reflecting the different aspects of audioverbal perception. There are 47 persons with a leading right hand (at the mean age of 29,04±9,97 years old) and 32 persons with a leading left hand (at the mean age of 29,41±10,34 years old) involved in this research. Different hypotheses about the mechanisms of the hemispheric control over audioverbal and motor processes are verified consistently. The research results show that both left- and right-handers’ peculiarities in the field of audioverbal perception depend on the right hemisphere activity mainly. The most dynamic and sensitive index of functioning of the two hemispheres during dichotic listening is the efficiency coefficient of stimuli reproduction through the left ear (efficiency coefficient (EC) of the left ear). It turns out that this index depends very much on the coincidence/noncoincidence of leading hemispheres in speech and motor processes. The highest efficiency of audioverbal perception reveals itself within the left-handers with a leading left ear (the hemispheric control coincidence), and the lowest one is within the left-handers with a leading right ear (the hemispheric control divergence). The right-handers are characterized by a less variation of values, although the influence of coincidence/noncoincidence of leading hemispheres in speech and motor processes also reveals itself as a tendency. This consistent pattern points out the necessity of further research of asymmetries of different modalities taking into account their probable interaction. The results of the fulfilled study comport with the scientific data about genotypic left-handers with the right ear coefficient (REC) subzero values to be the most efficient in comparison with left-handed persons who display REC high values.
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