sentence: Furthermore inhibitory transcranial magnetic stimulation ( TMS ) of the IPC disrupts the synesthetic Stroop effect ( Esterman et al ., 2006 ; Muggleton et al ., 2007 ; Rothen et al ., 2010 ) , which is usually observed in grapheme-color synesthetes ( Mattingley et al ., 2001 ; Elias et al ., 2003 ) .