title: Right-lateralized alpha desynchronization during regularity discrimination: hemispheric specialization or directed spatial attention?
abstract: When actively classifying abstract patterns according to their regularity, alpha desynchronization (ERD) becomes right lateralized over posterior brain areas. This could reflect temporary enhancement of contralateral visual inputs and specifically a shift of attention to the left, or right hemisphere specialization for regularity discrimination. This study tested these competing hypotheses. Twenty-four participants discriminated between dot patterns containing a reflection or a translation. The direction of the transformation, which matched one half onto the other half, was either vertical or horizontal. The strategy of shifting attention to one side of the patterns would not produce lateralized ERD in the horizontal condition. However, right-lateralized ERD was found in all conditions, regardless of orientation. We conclude that right hemisphere networks that incorporate the early posterior regions are specialized for regularity discrimination.
authors.affiliation: Department of Psychological Sciences, University of Liverpool, Liverpool, UK.
authors.forename: Damien
authors.initials: D
authors.lastname: Wright
authors.forename: Alexis D J
authors.initials: AD
authors.lastname: Makin
authors.forename: Marco
authors.initials: M
authors.lastname: Bertamini
mesh_terms: D000293:Adolescent; D000328:Adult; D000513:Alpha Rhythm / Q000502:physiology*; D001288:Attention / Q000502:physiology*; D003344:Cortical Synchronization / Q000502:physiology*; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology; D013028:Space Perception / Q000502:physiology*; D055815:Young Adult
keywords: Alpha; Event-related desynchronization; Lateralization; Sustained posterior negativity; Symmetry