▁found ▁increases ▁in ▁regional ▁c ere br al ▁blood ▁flow ▁( RC BF ) ▁in ▁the ▁following ▁six ▁brain ▁regions : ▁( 1 ) ▁the ▁pre front al ▁cor tex , ▁particularly ▁on ▁the ▁right ▁hem is phere ; ▁( 2 ) ▁the ▁hi pp oc amp al ▁and ▁par ah ipp oc amp al ▁regions ▁of ▁the ▁med ial ▁temporal ▁lo be ; ▁( 3 ) ▁the ▁anterior ▁c ing ulate ▁cor tex ; ▁( 4 ) ▁the ▁posterior ▁mid line ▁area ▁that ▁includes ▁posterior ▁c ing ulate , ▁ret ros pl en ial ▁( see ▁ret ros pl en ial ▁region ), ▁prec une us , ▁and ▁c une us ▁regions ; ▁( 5 ) ▁the ▁inferior ▁par iet al ▁cor tex , ▁especially ▁on ▁the ▁right ▁hem is phere ; ▁and ▁( 6 ) ▁the ▁c ere bell um , ▁particularly ▁on ▁the ▁left . ▁ ▁The ▁specific ▁role ▁of ▁each ▁of ▁the ▁six ▁main ▁regions ▁in ▁epis od ic ▁retr ieval ▁is ▁still ▁unclear , ▁but ▁some ▁ideas ▁have ▁been ▁suggested . ▁The ▁right ▁pre front al ▁cor tex ▁has ▁been ▁related ▁to ▁retr ieval ▁attempt ; ▁the ▁med ial ▁temporal ▁lo bes ▁to ▁conscious ▁re collection ; ▁the ▁anterior ▁c ing ulate ▁to ▁response ▁selection ; ▁the ▁posterior ▁mid line ▁region ▁to ▁imag ery ; ▁the ▁inferior ▁par iet al ▁to ▁aw aren ess ▁of ▁space ; ▁and ▁the ▁c ere bell um ▁to ▁self - init i ated ▁retr ieval ▁. ▁ ▁In ▁recent ▁research , ▁a