Fig 1.
Stimulus protocol including Gabor patches either forming a contour (CT) or none (NCT).
Fig 2.
Comparison of the original EEG recording (grand average over 18 subjects of channel O2) with ERM 5.
Fig 3.
Electrode placement according to the 10—20 system, and pooling into early and late response signals.
Fig 4.
Early Response (60-120 ms) P100 ERP.
Paired t-test values of significant potential amplitude differences at electrodes are illustrated at a significance level as specified. Views are axial, saggital and coronal. The left column shows the distribution on the scalp. All 62 electrodes were used as entries to the data matrix Φ. (Top): Raw ERP P100 with significance level P = 0.01. (Bottom): ERM5 extracted from the ERP P100 with significance level P = 0.001. Red color (positive paired T-test values) indicates that the ERP amplitude for the stimulus condition CT is larger than for condition NCT while blue color (negative paired T-test values) indicates that the ERP amplitude for the stimulus condition NCT is larger than for condition CT.
Table 1.
T-test statistics for early P100 ERP and ERM5 response.
The table shows coordinates of the most significant voxel of clusters. The sign of T-test values indicates the differences between stimuli (′−′NCT > CT, ′+′CT > NCT).
Fig 5.
Early Response (150-210 ms) N200 ERP.
Paired t-test values of significant potential amplitude differences at electrodes are illustrated at a significance level as specified. Views are axial, saggital and coronal. The left column shows the distribution on the scalp. All 62 electrodes were used as entries to the data matrix Φ. (Top): Raw ERP N200 with significance level P = 0.001. (Bottom): ERM5 extracted from the ERP N200 with significance level P = 0.001. Red color (positive paired T-test values) indicates that the ERP amplitude for the stimulus condition CT is larger than for condition NCT while blue color (negative paired T-test values) indicates that the ERP amplitude for the stimulus condition NCT is larger than for condition CT.
Table 2.
T-test statistics for early N200 ERP and ERM5 response.
The table shows coordinates of the most significant voxel of clusters. The sign of T-test values indicates the differences between stimuli (′−′NCT > CT, ′+′CT > NCT).
Fig 6.
Late Response (120-180 ms) P100 ERP.
Paired t-test values of significant potential amplitude differences at electrodes are illustrated at a significance level as specified. Views are axial, saggital and coronal. The left column shows the distribution on the scalp. All 62 electrodes were used as entries to the data matrix Φ. (Top): Raw ERP P100 with significance level P = 0.001. (Bottom): ERM5 extracted from the ERP P100 with significance level P = 0.001. Red color (positive paired T-test values) indicates that the ERP amplitude for the stimulus condition CT is larger than for condition NCT while blue color (negative paired T-test values) indicates that the ERP amplitude for the stimulus condition NCT is larger than for condition CT.
Table 3.
T-test statistics for late P100 ERP and ERM5 response.
The table shows coordinates of the most significant voxel of clusters. The sign of T-test values indicates the differences between stimuli (′−′NCT > CT, ′+′CT > NCT).
Fig 7.
Late Response (200-260 ms) N200 ERP.
Paired t-test values of significant potential amplitude differences at electrodes are illustrated at a significance level as specified. Views are axial, saggital and coronal. The left column shows the distribution on the scalp. All 62 electrodes were used as entries to the data matrix Φ. (Top): Raw ERP N200 with significance level P = 0.05. (Bottom): ERM5 extracted from the ERP N200 with significance level P = 0.01. Red color (positive paired T-test values) indicates that the ERP amplitude for the stimulus condition CT is larger than for condition NCT while blue color (negative paired T-test values) indicates that the ERP amplitude for the stimulus condition NCT is larger than for condition CT.
Table 4.
T-test statistics for late N200 ERM5 response.
The table shows coordinates of the most significant voxel of clusters. The sign of T-test values indicates the differences between stimuli (′−′NCT > CT, ′+′CT > NCT).
Fig 8.
Saggital view of left: the intrinsic mode VIMF1, as extracted with GiT-EEMD from fMRI data, and right: data reconstructed from ERM5. The latter was obtained from EEG data. The comparison concentrates on the late ERP N200.