Cortical potential imaging using L-curve and GCV method to choose the regularisation parameter

Table 2 Regularisation Parameter, MAG, RDM

Subject	Stimuli	GCV	L-curve	MAG	RDM
S1	fearful face	0.053647904825390	0.152452747854906	2.056	0.324
S1	neutral face	0.031140597094695	0.120884943960203	2.294	0.480
S1	control object	0.083040289002053	0.130773447052198	1.255	0.063
S2	fearful face	0.056017051286285	0.056846917686050	1.005	5.03e-5
S2	neutral face	0.070302890955651	0.062943521788770	0.967	2.17e-4
S2	control object	0.063992953233160	0.059812187027973	0.977	9.16e-4
S3	fearful face	0.050572034666208	0.061852135011805	1.071	0.0072
S3	neutral face	0.071407469554866	0.085678918300168	1.078	0.0084
S3	control object	0.057116631606758	0.068229559915199	1.069	0.0077

Comparison between the regularisation parameters, MAG index and RDM index between the cortical potential distributions obtained using L-curve and GCV method for all the three subjects. A value of MAG close to 1 and RDM close to 0 indicates a good fit. For S2 and S3 the fit is good, where as for S1 there is appreciable deviation.