Global efficiency can be analyzed for the whole brain network (Li et al., 2009;Wang et al., 2009;Meng et al., 2014;Stanley et al., 2015) or subnetworks (Sheffield et al., 2015;Beaty et al., 2016). For subnetworks, research of resting-state functional connectivity has shown that the brain can be organized into networks composed of functionally connected brain regions (van den Heuvel and Hulshoff Pol, 2010;Power et al., 2011;Raichle, 2011;Cole et al., 2013;Smith et al., 2013). In brain connectivity research the brain is usually divided into a set of non-overlapping regions and the definition of brain networks is related to the brain parcellation (note that a validated parcellation strategy is still lacking; Power et al., 2011;Wig et al., 2011). Power et al. (2011) divided the brain into 264 putative regions and showed that 13 networks based on the 264 regions are in good agreement with major functional systems of the brain. Cole et al. (2013) further reduced the 13 networks into 10 networks by excluding two networks with less clear functionality and combing the ''hand'' and ''face'' networks based on consensus of a unified primary motor system. The 10 networks based on the 264-region parcellation were the somato-motor network (SMN), cinguloopercular network (CON), auditory network (Aud.), default mode network (DMN), visual network (Vis.), fronto-parietal network (FPN), salience network (SAN), subcortical network (Sub.), ventral attention network (VAN) and dorsal attention network (DAN); and have been widely adopted in studies investigating relationships between network properties and cognitive functions (Cole et al., 2014b;Thompson and Fransson, 2015;Uddin, 2015;Vatansever et al., 2015;Long et al., 2016). For the major brain areas that have been found to be involved in ER, the lateral PFC is a core region of the FPN (Cole et al., 2013), the media PFC is a key region of the DMN Broyd et al., 2009), and the ACC is an important component of the CON (Power et al., 2011;Sadaghiani and D'Esposito, 2015). Based on the relationships between individual brain areas and ER and the relationships between individual brain areas and networks, it could be indicated that global efficiency in the FPN, DMN and CON is more likely to be associated with ER. This inference, however, remains to be verified by experimental data and would be difficult to be considered as a strong prior hypothesis. 
### Language ###
English

### Assessment ###
The text mentions specific brain networks and how many there are according to Cole et al. (2013), which would make for a straightforward information query.

### Query ###
How many major brain networks are there in the human brain?
How many major brain networks are there in the human brain?