Figure 3. P2 amplitudes (μV) to the first 30 standard tones and the last 30 standard tones within the first block of each EEG study, showing a reduced amplitude of responses to the later stimuli (i.e., a habituation effect) in the memantine-treated FXTAS group (solid green) and a normal control group (blue), but increased amplitudes to later stimuli in the other groups.

(**p = 0.002).