Global motion stimuli and form-from-motion stimuli: common characteristics and differential activation patterns.
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.
Vachon
Patrick
P
Centre de Recherche en Neuropsychologie et Cognition, Université de Montréal, Montréal, Canada.
Voss
Patrice
P
Lassonde
Maryse
M
Leroux
Jean-Maxime
JM
Mensour
Boualem
B
Beaudoin
Gilles
G
Bourgouin
Pierre
P
Guillemot
Jean-Paul
JP
Lepore
Franco
F
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
D010100:Oxygen