title: Absence of direction-specific cross-modal visual-auditory adaptation in motion-onset event-related potentials.
abstract: Adaptation to visual or auditory motion affects within-modality motion processing as reflected by visual or auditory free-field motion-onset evoked potentials (VEPs, AEPs). Here, a visual-auditory motion adaptation paradigm was used to investigate the effect of visual motion adaptation on VEPs and AEPs to leftward motion-onset test stimuli. Effects of visual adaptation to (i) scattered light flashes, and motion in the (ii) same or in the (iii) opposite direction of the test stimulus were compared. For the motion-onset VEPs, i.e. the intra-modal adaptation conditions, direction-specific adaptation was observed--the change-N2 (cN2) and change-P2 (cP2) amplitudes were significantly smaller after motion adaptation in the same than in the opposite direction. For the motion-onset AEPs, i.e. the cross-modal adaptation condition, there was an effect of motion history only in the change-P1 (cP1), and this effect was not direction-specific--cP1 was smaller after scatter than after motion adaptation to either direction. No effects were found for later components of motion-onset AEPs. While the VEP results provided clear evidence for the existence of a direction-specific effect of motion adaptation within the visual modality, the AEP findings suggested merely a motion-related, but not a direction-specific effect. In conclusion, the adaptation of veridical auditory motion detectors by visual motion is not reflected by the AEPs of the present study.
authors.affiliation: Department of Experimental Audiology, Otto-von-Guericke-University Magdeburg, Leipziger Straße 44, Magdeburg, D-39120, Germany.
authors.forename: Ramona
authors.initials: R
authors.lastname: Grzeschik
authors.affiliation: Department of Cognitive Psychology, Auditory Cognitive Neuroscience Laboratory, Ruhr University Bochum, Bochum, Germany.|Aging Research Group, Leibniz Research Centre for Working Environment and Human Factors, Dortmund, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Lewald
authors.affiliation: Department of Experimental Audiology, Otto-von-Guericke-University Magdeburg, Leipziger Straße 44, Magdeburg, D-39120, Germany.|Department of Ophthalmology, Visual Processing Laboratory, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany.
authors.forename: Jesko L
authors.initials: JL
authors.lastname: Verhey
authors.affiliation: Center for Behavioral Brain Sciences, Magdeburg, Germany.|Department of Ophthalmology, Visual Processing Laboratory, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany.
authors.forename: Michael B
authors.initials: MB
authors.lastname: Hoffmann
authors.affiliation: Aging Research Group, Leibniz Research Centre for Working Environment and Human Factors, Dortmund, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Getzmann
mesh_terms: D000161:Acoustic Stimulation; D000222:Adaptation, Physiological; D000328:Adult; D002540:Cerebral Cortex / Q000502:physiology*; D004569:Electroencephalography; D005072:Evoked Potentials, Auditory; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009039:Motion Perception / Q000502:physiology*; D010775:Photic Stimulation; D013017:Sound Localization / Q000502:physiology*; D055815:Young Adult
keywords: human; motion perception; multisensory space perception; sound localization; visual space perception