A sensorimotor/theta neurofeedback training consisted of 20 individuals sessions, twice a week during 11 weeks maximum. For each subject, NF was planned and conducted by a neuropsychologist experienced in neurophysiology an neurofeedback. Each session lasted 1h10 minutes and was conducted as follows:

• Preparation and installation of the electrodes, verification of the impedance, adjustement of the calibration.
• NF training (tasks and video described below)(45minutes)
• Feedback and debriefing about the session (15 minutes)

The intervention consisted to increase the synaptic strengths and sensitivity within this network. Electroencephalography signals for SMR/theta training was recorded at channel Cz according to the international 10-20 system. Theta rhythm was also recorded and, in this case, SMR was stimulated while theta waves were suppressed.A 32 channels system (EEGDigitrcak Biofeedback plus module, Inc Elmiko Medical) was used for the SMR/theta Neurofeedback training.

Assessment of verbal learning in episodic memory, evaluating the ability to encode, combine, store and long-term consolidation process.

Electroencephalography was recorded and EEG power spectrum was calculated using the fast Fourier transform. The power spectral density was calculated to extract the relative power for each frequency band and estimated as a log-ratio.