title: Lateralisation of non-metric rhythm.
abstract: There are contradictory results on lateralisation and localisation of rhythm processing. Our aim was to test whether there is a hemispheric dissociation of metric and non-metric rhythm processing. We created a non-metric rhythm stimulus without a sense of metre and we measured brain activities during passive rhythm perception. A total of 11 healthy, right-handed, native female Hungarian speakers aged 21.3 ± 1.1 were investigated by functional magnetic resonance imaging (fMRI) using a 3T MR scanner. The experimental acoustic stimulus consisted of comprehensive sentences transformed to Morse code, which represent a non-metric rhythm with irregular perceptual accent structure. Activations were found in the right hemisphere, in the posterior parts of the right-sided superior and middle temporal gyri and temporal pole as well as in the orbital part of the right inferior frontal gyrus. Additional activation appeared in the left-sided superior temporal region. Our study suggests that non-metric rhythm with irregular perceptual accents structure is confined to the right hemisphere. Furthermore, a right-lateralised fronto-temporal network extracts the continuously altering temporal structure of the non-metric rhythm.
authors.affiliation: Epilepsy Center Bethel, Bielefeld, Germany. reka.horvath@mara.de
authors.forename: R A
authors.initials: RA
authors.lastname: Horváth
authors.forename: A
authors.initials: A
authors.lastname: Schwarcz
authors.forename: M
authors.initials: M
authors.lastname: Aradi
authors.forename: T
authors.initials: T
authors.lastname: Auer
authors.forename: N
authors.initials: N
authors.lastname: Fehér
authors.forename: N
authors.initials: N
authors.lastname: Kovács
authors.forename: T
authors.initials: T
authors.lastname: Tényi
authors.forename: C
authors.initials: C
authors.lastname: Szalay
authors.forename: G
authors.initials: G
authors.lastname: Perlaki
authors.forename: G
authors.initials: G
authors.lastname: Orsi
authors.forename: S
authors.initials: S
authors.lastname: Komoly
authors.forename: T
authors.initials: T
authors.lastname: Dóczi
authors.forename: F G
authors.initials: FG
authors.lastname: Woermann
authors.forename: Cs
authors.initials: C
authors.lastname: Gyimesi
authors.forename: J
authors.initials: J
authors.lastname: Janszky
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods; D001307:Auditory Perception / Q000502:physiology*; D001931:Brain Mapping / Q000379:methods; D054022:Cerebrum / Q000502:physiology*; D004292:Dominance, Cerebral / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D010507:Periodicity; D013998:Time Perception / Q000502:physiology*; D055815:Young Adult