This study demonstrates that working memory in older adults can be revived by training specific brain behaviour. 

The method used focused on training particular organisational frequencies which the brain uses to transmit information between different areas of the neocortex.  

Adults between 60-76 years showed rapid and lasting improvement in working memory performance after one session.  

The method focuses on theta-gamma phase amplitude codes, or modulation, in the temporal cortex; and theta phase synchronisation across the fronto-temporal cortex.  In this case, transcranial alternating-current stimulation (tACS) was used.  

These protocols can be trained using neurofeedback training, which is non-invasive.