Real Time Processing of Affective and Cognitive Stimuli in the Human Brain Extracted from MEG Signals
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The magnetoencephalography (MEG) signal was recorded while subjects watched a video containing separate blocks of affective and cognitive advertisements and recalled slides extracted from the video a day later. An earlier behavioural study using the same video material showed that the affective advertisements were better recalled and that administration of propranolol (a beta-adrenergic blocker) abolished this effect. Magnetic field tomography (MFT) was used to extract tomographic estimates of activity millisecond by millisecond from the continuous MEG signal. Statistically significant differences between affective and cognitive blocks were identified in posterior and prefrontal areas. Cognitive blocks produced stronger activity in posterior parietal areas and superior prefrontal cortex in all three subjects. Affective blocks modulated activity in orbitofrontal and retrosplenial cortex, amygdala and brainstem. Individual contributions to the statistical maps were traced in real time from milliseconds to many seconds. Time-locked responses from the recall session were used to compare average and single trial MFT solutions and to combine activations from all subjects into a common anatomical space. The last step produced statistically significant increases in occipital and inferior ventral cortex between 100 and 200 ms compared to a prestimulus baseline.
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- Real Time Processing of Affective and Cognitive Stimuli in the Human Brain Extracted from MEG Signals
Volume 13, Issue 1 , pp 11-19
- Cover Date
- Print ISSN
- Online ISSN
- Kluwer Academic Publishers-Plenum Publishers
- Additional Links
- magnetoencephalography (MEG)
- orbitofrontal cortex
- retrosplenial cortex
- superior prefrontal cortex
- affective and cognitive stimuli
- magnetic field tomography (MFT)
- Statistical measures
- Author Affiliations
- 1. Lab. for Human Brain Dynamics, Brain Science Institute (BSI), RIKEN, Wako-shi, Saitama, Japan
- 2. Department of Psychology, McMaster University, Hamilton, Ontario, Canada
- 3. Institute of Medicine, Research Centre Jülich, Jülich, Germany
- 4. Department of Biology, The Open University, Milton Keynes, UK
- 6. London Business School, Sussex Place, London, UK