▁a ▁source ▁of ▁behavior al ▁variation ▁but ▁do ▁not ▁see ▁it ▁as ▁an ▁evolution ary ▁process ▁or ▁its ▁potential ▁to ▁have ▁significantly ▁affected ▁human ▁evolution . ▁Gene - c ulture ▁co e volution ▁would ▁argue ▁that ▁culture ▁tra its ▁may ▁have ▁alter ed ▁gen etic ▁change ▁and ▁selection ▁press ures , ▁ultimately ▁affect ing ▁cogn ition . ▁However , ▁as ▁Brown ▁et ▁al . ▁( 2 0 1 1 ) ▁states :" Wh ether ▁human ▁behaviour al ▁e colog ists ▁and ▁evolution ary ▁psych olog ists ▁are ▁willing ▁to ▁accommod ate ▁the ▁idea ▁that ▁some ▁portion ▁of ▁human ▁behaviour al ▁divers ity ▁could ▁result ▁from ▁gen etic ▁differences ▁that ▁have ▁ar isen ▁via ▁selection ▁press ures ▁im posed ▁by ▁soci ally ▁transm itted ▁behaviour ▁remains ▁to ▁be ▁seen ." ▁▁ <0x09> ▁While ▁this ▁may ▁difficult , ▁some ▁evolution ary ▁psych olog ists , ▁such ▁as ▁Gang est ad , ▁Has el ton , ▁and ▁B uss ▁( 2 0 0 6 ) ▁have ▁argued ▁that ▁the ▁future ▁of ▁the ▁discipline ▁rest s ▁on ▁un ifying ▁transm itted ▁and ▁ev oked ▁culture . ▁In ▁order ▁to ▁do ▁so , ▁the ▁authors ▁suggest ▁that ▁a ▁more ▁compreh ensive ▁definition ▁of ▁culture ▁needs ▁to ▁be ▁developed ▁since ▁different ▁cultural ▁phen omena ▁need ▁different ▁kinds ▁of ▁analysis ▁to ▁investigate ▁their ▁effects . ▁As ▁they ▁state , ▁“ Culture , ▁however , ▁is ▁not ▁a ▁" thing " ▁with ▁singular ity ; ▁it ' s ▁an ▁um bre lla ▁concept ▁sub sum ing ▁a ▁collection ▁of ▁extra ordin