Neuroscience 2005 Abstract
| Presentation Number: | 771.23 |
|---|---|
| Abstract Title: | Subliminal priming of words investigated with MEG. |
| Authors: |
Kringelbach, M. L.*1
; Dehaene, S.
; Cornelissen, P. L.
; Holliday, I. E.
; Hansen, P. C.1
1Physiology, Univ. of Oxford, Oxford, United Kingdom |
| Primary Theme and Topics |
Cognition and Behavior - Human Cognition, Behavior, and Anatomy -- Language |
| Secondary Theme and Topics | Cognition and Behavior<br />- Human Cognition, Behavior, and Anatomy<br />-- Timing and temporal processing |
| Session: |
771. Language IV Poster |
| Presentation Time: | Tuesday, November 15, 2005 3:00 PM-4:00 PM |
| Location: | Washington Convention Center - Hall A-C, Board # OO11 |
| Keywords: | LANGUAGE, CONSCIOUSNESS, MAGNETOENCEPHALOGRAPHY |
The use of subliminal priming techniques together with MEG and beamformer analysis methods offer the potential to dissociate successive stages in the processing of words in the brain. MEG was used to measure cortical activity during subliminal priming of visual words. Four conditions between prime and targets were presented: direct repetition (e.g. HOUSE -> HOUSE), cross-case (e.g. house -> HOUSE), bigram (e.g. HUSE -> HOUSE) and unrelated (e.g. STAND -> HOUSE). Each of these conditions were presented with the letter strings in either the same or different absolute positions. Participants were instructed to maintain fixation and indicate by button press, whether the letter string they saw contained I or O.
MEG data were collected from adult right-handed readers using a 151-channel CTF Omega system at Aston University. Data were sampled at 625 Hz with an antialiasing cut-off filter of 200 Hz. The MEG data were analyzed using Synthetic Aperture Magnetometry (SAM), which is an adaptive beamforming analysis technique. The SAM analysis created statistical volumes covering the whole brain in each individual subject (voxel size 5x5x5 mm), which were then normalised to standard MNI space, allowing calculation of group effects.
Previous behavioural repetition priming findings were replicated. The MEG analysis revealed the temporal timecourse of cortical activity to each of the stimuli classes using overlapping time windows up to 500 msec and overlapping frequency bands up to 80Hz, with a reference period of 250msec pre-stimulus onset. Furthermore, dissociable neural responses were found in direct comparisons between the different stimulus classes. Consistent with a number of computational models of visual word recognition, the results suggest a hierarchy of processing from retinotopic feature extraction, through individual letter and letter cluster recognition to whole word processing.
MEG data were collected from adult right-handed readers using a 151-channel CTF Omega system at Aston University. Data were sampled at 625 Hz with an antialiasing cut-off filter of 200 Hz. The MEG data were analyzed using Synthetic Aperture Magnetometry (SAM), which is an adaptive beamforming analysis technique. The SAM analysis created statistical volumes covering the whole brain in each individual subject (voxel size 5x5x5 mm), which were then normalised to standard MNI space, allowing calculation of group effects.
Previous behavioural repetition priming findings were replicated. The MEG analysis revealed the temporal timecourse of cortical activity to each of the stimuli classes using overlapping time windows up to 500 msec and overlapping frequency bands up to 80Hz, with a reference period of 250msec pre-stimulus onset. Furthermore, dissociable neural responses were found in direct comparisons between the different stimulus classes. Consistent with a number of computational models of visual word recognition, the results suggest a hierarchy of processing from retinotopic feature extraction, through individual letter and letter cluster recognition to whole word processing.
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2005 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2005. Online.
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