Modulation of hemispheric language dominance of left-handers according to musical experience: an fMRI study
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Título
Modulation of hemispheric language dominance of left-handers according to musical experience: an fMRI studyAutoría
Tutor/Supervisor; Universidad.Departamento
Ávila Rivera, César; Universitat Jaume I. Departament de Psicologia Bàsica, Clínica i Psicobiologia.Fecha de publicación
2018-07-24Editor
Universitat Jaume IResumen
INTRODUCTION: Language processing is a function presenting a strong hemispheric leftdominance in the vast majority of population (94-96% of right-handers). Nonetheless, some
conditions such as left-handedness have ... [+]
INTRODUCTION: Language processing is a function presenting a strong hemispheric leftdominance in the vast majority of population (94-96% of right-handers). Nonetheless, some
conditions such as left-handedness have been associated with a higher incidence of atypical (right
or bilateral) language dominance. Structural and functional asymmetry differences in primary
auditory cortex (Heschl’s gyrus) and secondary auditory cortex (planum temporale) have been
hypothesized as the underlying causal factor of this modulation by handedness. In this study, due
to the differential development of Heschl’s gyrus previously described in musicians, we put to
test if musicians could present a modulation of their hemispheric language dominance when
compared to nonmusicians. EXPERIMENTAL PROCEDURES: We assessed hemispheric
language dominance in musicians and nonmusicians (both right-handed and left-handed) using
an fMRI language paradigm (verb generation task). Language dominance was established for
each participant via the calculation of functional laterality indexes in the prefrontal region.
RESULTS: Left-handed musicians were more likely to be right-dominant (34.5%) than lefthanded nonmusicians (5.3%). No differences were found among right-handed participants.
DISCUSSION: Musical experience is related to a higher probability of presenting a rightdominance of language, but only in left-handed population. As musical training begins after
language dominance is presumably already established, we interpret these results as an evidence
of a common underlying factor linking both language dominance and the probability to undergo
musical training. We propose the differential development of auditory cortex as this relating
factor. [-]
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Descripción
Treball Final de Màster Universitari en Investigació en Cervell i Conducta. Codi: SBM024. Curs: 2017/2018
Tipo de documento
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