In order to analyze data statistically, each power measurement during treatment was divided by the median power in the reference run (baseline) in order to place all animals on the same scale despite factors that made the absolute power different between animals. Data were subsequently normalized using a log transformation. Power difference between a 5-min interval and the baseline level 30-min period was tested against zero using the Student’s t-test. Values of p < 0.05 were considered statistically significant.
