Next, temporal changes in EMG activity, EMG frequency and tongue pressure were analyzed. For this purpose, we divided the 7-s measurement time into two 3-s periods: Early (1–4 s) and Late (4–7 s). The first 1 s was not analyzed because EMGs and tongue pressure at the beginning included the raising of the tongue (Fig 2). Each parameter was compared using a repeated measures ANOVA with the following factors: Position (Ant vs Post) and Substage (Early vs Late).