Document Detail

An intracranial event-related potential study on transformational apparent motion. Does its neural processing differ from real motion?
MedLine Citation:
PMID:  22071683     Owner:  NLM     Status:  MEDLINE    
How the brain processes visual stimuli has been extensively studied using scalp surface electrodes and magnetic resonance imaging. Using these and other methods, complex gratings have been shown to activate the ventral visual stream, whereas moving stimuli preferentially activate the dorsal stream. In the current study, a first experiment assessed brain activations evoked by complex gratings using intracranial electroencephalography in 10 epileptic patients implanted with subdural electrodes. These stimuli of intermediate levels of complexity were presented in such a way that transformational apparent motion (TAM) was perceived. Responses from both the ventral and the dorsal pathways were obtained. The response characteristics of visual area 4 and the fusiform cortex were of similar amplitudes, suggesting that both ventral areas are recruited for the processing of complex gratings. On the other hand, TAM-induced responses of dorsal pathway areas were relatively noisier and of lower amplitudes, suggesting that TAM does not activate motion-specific structures to the same extent as does real motion. To test this hypothesis, we examined the activity evoked by TAM in comparison to the one produced by real motion in a patient implanted with the same subdural electrodes. Findings demonstrated that neural response to real motion was much stronger than that evoked by TAM, in both the primary visual cortex (V1) and other motion-sensitive areas within the dorsal pathway. These results support the conclusion that apparent motion, even if perceptually similar to real motion, is not processed in a similar manner.
Josie-Anne Bertrand; Maryse Lassonde; Manon Robert; Dang Khoa Nguyen; Armando Bertone; Marie-Ève Doucet; Alain Bouthillier; Franco Lepore
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-11-10
Journal Detail:
Title:  Experimental brain research     Volume:  216     ISSN:  1432-1106     ISO Abbreviation:  Exp Brain Res     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-01-03     Completed Date:  2012-04-27     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  145-53     Citation Subset:  IM    
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MeSH Terms
Brain Mapping*
Epilepsy / pathology,  physiopathology,  surgery
Evoked Potentials / physiology*
Evoked Potentials, Visual / physiology*
Magnetic Resonance Imaging
Motion Perception / physiology*
Photic Stimulation
Reaction Time
Visual Cortex / physiopathology*
Visual Pathways
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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