Resting-State Networks at Higher Frequencies: A Preliminary Study

Hsu-Lei Lee¹, Benjamin Zahneisen¹, Thimo Grotz¹, Pierre LeVan¹, Jrgen Hennig¹

Resting-state network analysis looks for coherent spontaneous BOLD signal fluctuations at frequencies lower than 0.1 Hz, where the most signal energy is stored. However hemodynamic signal change can occur at a faster rate and can also have different characteristics at different time scales. By using a highly under-sampled shell trajectory we were able to resolve a frequency spectrum up to 5 Hz. Preliminary tests found both coherent networks that are similar to those at 0.01~0.1 Hz frequency band, and some that differ.