title: Kinesthetic and vestibular information modulate alpha activity during spatial navigation: a mobile EEG study.
abstract: In everyday life, spatial navigation involving locomotion provides congruent visual, vestibular, and kinesthetic information that need to be integrated. Yet, previous studies on human brain activity during navigation focus on stationary setups, neglecting vestibular and kinesthetic feedback. The aim of our work is to uncover the influence of those sensory modalities on cortical processing. We developed a fully immersive virtual reality setup combined with high-density mobile electroencephalography (EEG). Participants traversed one leg of a triangle, turned on the spot, continued along the second leg, and finally indicated the location of their starting position. Vestibular and kinesthetic information was provided either in combination, as isolated sources of information, or not at all within a 2 × 2 full factorial intra-subjects design. EEG data were processed by clustering independent components, and time-frequency spectrograms were calculated. In parietal, occipital, and temporal clusters, we detected alpha suppression during the turning movement, which is associated with a heightened demand of visuo-attentional processing and closely resembles results reported in previous stationary studies. This decrease is present in all conditions and therefore seems to generalize to more natural settings. Yet, in incongruent conditions, when different sensory modalities did not match, the decrease is significantly stronger. Additionally, in more anterior areas we found that providing only vestibular but no kinesthetic information results in alpha increase. These observations demonstrate that stationary experiments omit important aspects of sensory feedback. Therefore, it is important to develop more natural experimental settings in order to capture a more complete picture of neural correlates of spatial navigation.
authors.affiliation: Neurobiopsychology, Institute of Cognitive Science, University of Osnabrück Osnabrück, Germany.
authors.forename: Benedikt V
authors.initials: BV
authors.lastname: Ehinger
authors.affiliation: Neurobiopsychology, Institute of Cognitive Science, University of Osnabrück Osnabrück, Germany.
authors.forename: Petra
authors.initials: P
authors.lastname: Fischer
authors.affiliation: Neurobiopsychology, Institute of Cognitive Science, University of Osnabrück Osnabrück, Germany.
authors.forename: Anna L
authors.initials: AL
authors.lastname: Gert
authors.affiliation: Neurobiopsychology, Institute of Cognitive Science, University of Osnabrück Osnabrück, Germany.
authors.forename: Lilli
authors.initials: L
authors.lastname: Kaufhold
authors.affiliation: Neurobiopsychology, Institute of Cognitive Science, University of Osnabrück Osnabrück, Germany.
authors.forename: Felix
authors.initials: F
authors.lastname: Weber
authors.affiliation: Neuroinformatics, Institute of Cognitive Science, University of Osnabrück Osnabrück, Germany.
authors.forename: Gordon
authors.initials: G
authors.lastname: Pipa
authors.affiliation: Neurobiopsychology, Institute of Cognitive Science, University of Osnabrück Osnabrück, Germany ; Department of Neurophysiology and Pathophysiology, University Medical Center Hamburg-Eppendorf Hamburg, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: König
keywords: alpha band; alpha suppression; event related desynchronization; independent component analysis; mobile EEG; spatial navigation; time-frequency analysis; virtual reality