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example:difference_erf [2018/10/21 15:07]
42.49.180.224 [Background]
example:difference_erf [2017/08/17 11:21] (current)
127.0.0.1 external edit
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   F(diff) = 0.1 * F1 + 0.1 * F2   F(diff) = 0.1 * F1 + 0.1 * F2
  
-Here the original field distributions in both conditions are dominated by the strongest source 1, whereas the difference field reveals source 1 and 2 equally strong. Source reconstruction of the difference field in this case would involves a fit with a two-dipole model. Important is that just by eye-balling the spatial distribution it is already possible to distinguish the two sources, whereas the original field distributions of the two original conditions will be difficult, if not impossible, to distinguish.+Here the original field distributions in both conditions are dominated by the strongest source 1, whereas the difference field reveals source 1 and 2 equally strong. Source reconstruction of the difference field in this case would involves a fit with a two-dipole model. Important is that just by eye-balling the spatial distribution it is already possible to distinguish the two sources, whereas the original field distributions of the two original conditions will be difficult, if not impossible, to distinguish. ​ 
 =====Applied to the experimental data===== =====Applied to the experimental data=====
  
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 To compute the difference ERF or ERP in FieldTrip, you would use **[[:​reference:​ft_timelockanalysis]]** on each of the conditions, followed by **[[:​reference:​ft_math]]** to compute the difference. The difference is used in **[[:​reference:​ft_dipolefitting]]** or **[[:​reference:​ft_sourceanalysis]]**. To compute the difference ERF or ERP in FieldTrip, you would use **[[:​reference:​ft_timelockanalysis]]** on each of the conditions, followed by **[[:​reference:​ft_math]]** to compute the difference. The difference is used in **[[:​reference:​ft_dipolefitting]]** or **[[:​reference:​ft_sourceanalysis]]**.
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