title: Differential recruitment of brain networks during visuospatial and color processing: Evidence from ERP microstates.
abstract: Recent functional magnetic resonance imaging (fMRI) studies consistently revealed contributions of fronto-parietal and related networks to the execution of a visuospatial judgment task, the so-called "Clock Task". However, due to the low temporal resolution of fMRI, the exact cortical dynamics and timing of processing during task performance could not be resolved until now. In order to clarify the detailed cortical activity and temporal dynamics, 14 healthy subjects performed an established version of the "Clock Task", which comprises a visuospatial task (angle discrimination) and a control task (color discrimination) with the same stimulus material, in an electroencephalography (EEG) experiment. Based on the time-resolved analysis of network activations (microstate analysis), differences in timing between the angle compared to the color discrimination task were found after sensory processing in a time window starting around 200 ms. Significant differences between the two tasks were observed in an analysis window from 192 ms to 776 ms. We divided this window in two parts: an early phase - from 192 ms to ∼440 ms, and a late phase - from ∼440 ms to 776 ms. For both tasks, the order of network activations and the types of networks were the same, but, in each phase, activations for the two conditions were dominated by differing network states with divergent temporal dynamics. Our results provide an important basis for the assessment of deviations in processing dynamics during visuospatial tasks in clinical populations.
authors.affiliation: Translational Research Center, University Hospital of Psychiatry, University of Bern, Bolligenstrasse 111, CH-3000 Bern 60, Switzerland; Department of Neurobiology and Biophysics, Vilnius University, Ciurlionio 21/27, LT-03101 Vilnius, Lithuania. Electronic address: ingrida.antonova@gmail.com.
authors.forename: I
authors.initials: I
authors.lastname: Antonova
authors.affiliation: Translational Research Center, University Hospital of Psychiatry, University of Bern, Bolligenstrasse 111, CH-3000 Bern 60, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Bänninger
authors.affiliation: Translational Research Center, University Hospital of Psychiatry, University of Bern, Bolligenstrasse 111, CH-3000 Bern 60, Switzerland.
authors.forename: T
authors.initials: T
authors.lastname: Dierks
authors.affiliation: Department of Neurobiology and Biophysics, Vilnius University, Ciurlionio 21/27, LT-03101 Vilnius, Lithuania.
authors.forename: I
authors.initials: I
authors.lastname: Griskova-Bulanova
authors.affiliation: Translational Research Center, University Hospital of Psychiatry, University of Bern, Bolligenstrasse 111, CH-3000 Bern 60, Switzerland.
authors.forename: T
authors.initials: T
authors.lastname: Koenig
authors.affiliation: Institute of Cognitive Science, University of Osnabrück, Albrechtstrasse 28, D-49076 Osnabrück, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Kohler
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D019540:Area Under Curve; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D003116:Color; D003118:Color Perception / Q000502:physiology*; D004569:Electroencephalography; D004585:Electrooculography; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D006801:Humans; D007600:Judgment; D008297:Male; D009434:Neural Pathways / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation; D011930:Reaction Time; D013028:Space Perception / Q000502:physiology*; D055815:Young Adult
keywords: EEG; ERP; frontal cortex; microstate analysis; parietal cortex; visuospatial judgment