Delayed response to animate implied motion in human motion processing areas.
Viewing static photographs of objects in motion evokes higher fMRI activation in the human medial temporal complex (MT+) than looking at similar photographs without this implied motion. As MT+ is traditionally thought to be involved in motion perception (and not in form perception), this finding suggests feedback from object-recognition areas onto MT+. To investigate this hypothesis, we recorded extracranial potentials evoked by the sight of photographs of biological agents with and without implied motion. The difference in potential between responses to pictures with and without implied motion was maximal between 260 and 400 msec after stimulus onset. Source analysis of this difference revealed one bilateral, symmetrical dipole pair in the occipital lobe. This area also showed a response to real motion, but approximately 100 msec earlier than the implied motion response. The longer latency of the implied motion response in comparison to the real motion response is consistent with a feedback projection onto MT+ following object recognition in higher-level temporal areas.
Helmholtz Research Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
Jeannette A M
JA
Lorteije
J Leon
JL
Kenemans
Tjeerd
T
Jellema
Rob H J
RH
van der Lubbe
Frederiek
F
de Heer
Richard J A
RJ
van Wezel
D000328:Adult; D001931:Brain Mapping; D004569:Electroencephalography / Q000379:methods; D005074:Evoked Potentials, Visual / Q000502:physiology; D005260:Female; D005425:Flicker Fusion; D005556:Form Perception / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D009038:Motion; D009039:Motion Perception / Q000502:physiology*; D010100:Oxygen / Q000097:blood; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation / Q000379:methods; D011930:Reaction Time / Q000502:physiology*; D013702:Temporal Lobe / Q000098:blood supply / Q000502:physiology*; D013997:Time Factors
D010100:Oxygen