sentence: A very recent hypothesis based on findings of the graph theoretical network analysis states that synesthetes have a generally hyper-connected brain ( Hanggi et al ., 2011 ; Jancke and Langer , 2011 ) which may lead to alterations in multimodal integration processes at a global level within this population ( Esterman et al ., 2006 ; Mulvenna and Walsh , 2006 ) .