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Table 2 Beta-ERD responses for preictal-interictal, ictal-interictal and postictal-interictal comparisons

From: Fluctuations of sensorimotor processing in migraine: a controlled longitudinal study of beta event related desynchronization

Beta-ERD response
  Mean ratio (± SD retransformed)  
C3 Sensorimotor Interictal Compared period p
 Preictal 0.84 (0.61–1.15) 0.71 (0.46–1.10) .038
 Ictal 0.79 (0.62–1.01) 0.74 (0.54–1.02) .49
 Postictal 0.74 (0.49–1.12) 0.73 (0.54–1.00) .97
C3 Motor
 Preictal 1.12 (0.78–1.61) 0.96 (0.76–1.21) .049
 Ictal 1.05 (0.72–1.52) 1.04 (0.69–1.55) .93
 Postictal 0.93 (0.49–1.74) 0.73 (0.47–1.14) .23
C4 Sensorimotor
 Preictal 0.83 (0.65–1.06) 0.71 (0.48–1.05) .23
 Ictal 0.83 (0.56–1.21) 0.79 (0.51–1.24) .70
 Postictal 0.68 (0.46–1.02) 0.72 (0.57–0.92) .72
C4 Motor
 Preictal 1.10 (0.70–1.70) 1.14 (0.74–1.74) .76
 Ictal 1.19 (0.76–1.85) 1.23 (0.82–1.86) .73
 Postictal 1.06 (0.57–1.99) 0.76 (0.44–1.34) .23
  1. Beta-ERD response is the ratio between mean power in the interval from 1 to 3 s after movement onset and mean power in the interval − 3 to − 1 s before movement onset (baseline). Ratios were LN-transformed before statistical analysis and retransformed to mean ratios and mean ± SD for tabulation. Paired Student’s t-tests are included. EEG from central electrodes C3 (contralateral, left) and C4 (ipsilateral right) for the sensorimotor test and motor test
  2. Bold entries are significant p-values
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