title: γ band oscillations in parietooccipital areas during performance of a sensorimotor integration task: a qEEG coherence study.
abstract: This study aimed to elucidate cortical mechanisms involved in anticipatory actions when 23 healthy right-handed subjects had to catch a free falling object through quantitative electroencephalogram (qEEG). For this reason, we used coherence that represents a measurement of linear covariation between two signals in the frequency domain. In addition, we investigated gamma-band (30-100 Hz) activity that is related to cognitive and somatosensory processes. We hypothesized that gamma coherence will be increase in both parietal and occipital areas during moment after ball drop, due to their involvement in manipulation of objects, visuospatial processing, visual perception, stimuli identification and attention processes. We confirmed our hypothesis, an increase in gamma coherence on P3-P4 (t= -2.15; p=0.033) and PZ-OZ (t= -2.16; p=0.034) electrode pairs was verified for a paired t-test. We conclude that to execute tasks involving anticipatory movements (feedforward mechanisms), like our own task, probably, there is no need of a strong participation of visual areas in the process of information organization to manipulate objects and to process visuospatial information regarding the contact hand-object.
authors.affiliation: Institute of Psychiatry, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Silmar
authors.initials: S
authors.lastname: Teixeira
authors.forename: Bruna
authors.initials: B
authors.lastname: Velasques
authors.forename: Sergio
authors.initials: S
authors.lastname: Machado
authors.forename: Flávia
authors.initials: F
authors.lastname: Paes
authors.forename: Marlo
authors.initials: M
authors.lastname: Cunha
authors.forename: Henning
authors.initials: H
authors.lastname: Budde
authors.forename: Renato
authors.initials: R
authors.lastname: Anghinah
authors.forename: Luis F H
authors.initials: LF
authors.lastname: Basile
authors.forename: Mauricio
authors.initials: M
authors.lastname: Cagy
authors.forename: Roberto
authors.initials: R
authors.lastname: Piedade
authors.forename: Pedro
authors.initials: P
authors.lastname: Ribeiro
mesh_terms: D000328:Adult; D001931:Brain Mapping; D058256:Brain Waves / Q000502:physiology*; D004569:Electroencephalography / Q000379:methods*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008297:Male; D009778:Occipital Lobe / Q000502:physiology; D010296:Parietal Lobe / Q000502:physiology; D011597:Psychomotor Performance / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*