Hemodynamic and electroencephalographic responses to illusory figures: recording of the evoked potentials during functional MRI.
Neuroimage
; 14(6): 1327-36, 2001 Dec.
Article
in En
| MEDLINE
| ID: mdl-11707088
ABSTRACT
The feasibility of recording event-related potentials (ERP) during functional MRI (fMRI) scanning using higher level cognitive stimuli was studied. Using responses to illusory figures in a visual oddball task, evoked potentials were obtained with their expected configurations and latencies. A rapid stimulation scheme using randomly varied trial lengths was employed, and class-wise characteristics of the hemodynamic response were obtained by a nonlinear analysis of the fMRI time series. Implications and limitations of conducting combined ERP-fMRI experiments using higher level cognitive stimuli are discussed. EEG/fMRI results revealed a sequential activation of striate and extrastriate occipital cortex along the ventral path of object processing for Kanizsa figures. Interestingly, Kanizsa figures activated the human motion area MT. Targets resulted in activations of frontal and parietal cortex which were not activated for standard stimuli.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Optical Illusions
/
Pattern Recognition, Visual
/
Visual Cortex
/
Magnetic Resonance Imaging
/
Electroencephalography
/
Occipital Lobe
Type of study:
Prognostic_studies
Limits:
Adult
/
Female
/
Humans
/
Male
Language:
En
Journal:
Neuroimage
Journal subject:
DIAGNOSTICO POR IMAGEM
Year:
2001
Document type:
Article
Affiliation country:
Alemania