P1‐278: The efficacy of a medical food (Souvenaid ® ) in Alzheimer's disease: Results from the first trial and design of future trials

of the ten patients we also recorded the electroencephalogram (EEG). EEG were recorded at T0 and at T1 for 5 five minutes through 21 electrodes following the 10-200 International System with a sampling frequency of 1024 Hz, a bandpass of 0,5-500 Hz, and a sensibility of 7 uV/mm. EEG were analyzed in the frequency domain (power spectrum and coherence). Results: AtDCS improved the accuracy of the word recognition task (p1⁄40.0068), CtDCS significantly worsened it (p1⁄40.011), and StDCS left it unchanged. tDCS left the visual attention RTs unchanged. AtDCS and CtDCS produced specific, differential, and significant effects over the mean power spectral density, the interand intra-hemispheric coherence in all the electrodes (p<0.0001). In particular, whereas AtDCS increased the occipital intra-hemispheric coherence in the gamma band (p1⁄40,047), CtDCS increased it in the d band (p1⁄40,021). Conclusions: tDCS delivered over the T-P cortex modulated cortical electrophysiological activity and improved a recognition memory task in patients with probable AD.