title: Global motion stimuli and form-from-motion stimuli: common characteristics and differential activation patterns.
abstract: We used functional Magnetic Resonance Imaging (fMRI) to explore the areas underlying the processing of two similar motion stimuli that evoke different types of processing. The results indicated that while form-from-motion (FFM) stimuli activated both lateral occipital complex (LOC) and MT complex (MT+), only the LOC remained significantly activated when contrasted with a global motion stimulus (GMS) with different coherence levels. Because of the large number of common characteristics shared between the stimuli, this contrast enabled us to isolate the regions implicated in form processing. The GMS on the other hand only activated MT+, reaching maximal intensity for low coherence. Overall, these data illustrate how two similar motion stimuli can elicit the participation of different cortical visual regions.
authors.affiliation: Centre de Recherche en Neuropsychologie et Cognition, Université de Montréal, Montréal, Canada.
authors.forename: Patrick
authors.initials: P
authors.lastname: Vachon
authors.forename: Patrice
authors.initials: P
authors.lastname: Voss
authors.forename: Maryse
authors.initials: M
authors.lastname: Lassonde
authors.forename: Jean-Maxime
authors.initials: JM
authors.lastname: Leroux
authors.forename: Boualem
authors.initials: B
authors.lastname: Mensour
authors.forename: Gilles
authors.initials: G
authors.lastname: Beaudoin
authors.forename: Pierre
authors.initials: P
authors.lastname: Bourgouin
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Guillemot
authors.forename: Franco
authors.initials: F
authors.lastname: Lepore
mesh_terms: D000328:Adult; D001931:Brain Mapping; D002755:Choice Behavior / Q000502:physiology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D016014:Linear Models; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D009038:Motion; D009039:Motion Perception / Q000502:physiology*; D010100:Oxygen / Q000097:blood; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D011930:Reaction Time; D013997:Time Factors; D014793:Visual Cortex / Q000098:blood supply / Q000502:physiology*; D055815:Young Adult
chemical_list: D010100:Oxygen