**5. Conclusions**

In conclusion, this case report of a spatial, spectral, and functional dissociation between alpha and xi supplies the foundation to further experiments, with the potential outcome to break the unitary view of alpha rhythm and attentional processes, which many other electrophysiologists have already suggested [24,31,35,37,54,65].

**Funding:** Some of this work received a Neuroscience Pilot Award from Florida Atlantic University's Brain Institute. E.T. is supported by the US National Institute of Health, NIBIB EB025819 and NIMH MH080838.

**Acknowledgments:** Rodrigo Calderon collected some of the data presented in this report, and Rodrigo Calderon, Nurgun Erdol, and Salvatore Morgera contributed some earlier analysis. Intense discussions with Erik Engeberg concerning xi and mu are gratefully acknowledged.

**Conflicts of Interest:** The author declares no conflict of interest.
