AI Article Synopsis
- The study explores how emotional relevance of stimuli affects brain activity, specifically in sensory areas, using MEG technology for high-resolution analysis.
- The findings indicate that viewing affective images boosts visual processing in the occipital region of the brain compared to neutral images, with the effect transitioning to parietal and temporal regions over time.
- This suggests that the impact of emotional stimuli on brain activity is dynamic and emphasizes the need to carefully select regions and timing in future cortical activity analyses.
Article Abstract
Background: The affective and motivational relevance of a stimulus has a distinct impact on cortical processing, particularly in sensory areas. However, the spatial and temporal dynamics of this affective modulation of brain activities remains unclear. The purpose of the present study was the development of a paradigm to investigate the affective modulation of cortical networks with a high temporal and spatial resolution. We assessed cortical activity with MEG using a visual steady-state paradigm with affective pictures. A combination of a complex demodulation procedure with a minimum norm estimation was applied to assess the temporal variation of the topography of cortical activity.
Results: Statistical permutation analyses of the results of the complex demodulation procedure revealed increased steady-state visual evoked field amplitudes over occipital areas following presentation of affective pictures compared to neutral pictures. This differentiation shifted in the time course from occipital regions to parietal and temporal regions.
Conclusion: It can be shown that stimulation with affective pictures leads to an enhanced activity in occipital region as compared to neutral pictures. However, the focus of differentiation is not stable over time but shifts into temporal and parietal regions within four seconds of stimulation. Thus, it can be crucial to carefully choose regions of interests and time intervals when analyzing the affective modulation of cortical activity.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2717100 | PMC |
| http://dx.doi.org/10.1186/1471-2202-10-83 | DOI Listing |
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