▁sentence ▁used ▁to ▁typ ify ▁this ▁phenomen on ▁is ▁More ▁people ▁have ▁been ▁to ▁Russia ▁than ▁I ▁have . ▁The ▁effect ▁has ▁also ▁been ▁observed ▁in ▁other ▁languages . ▁Some ▁studies ▁have ▁suggested ▁that , ▁at ▁least ▁in ▁English , ▁the ▁effect ▁is ▁stronger ▁for ▁sentences ▁whose ▁predicate ▁is ▁repeat able . ▁The ▁effect ▁has ▁also ▁been ▁found ▁to ▁be ▁stronger ▁in ▁some ▁cases ▁when ▁there ▁is ▁a ▁pl ural ▁subject ▁in ▁the ▁second ▁clause . ▁ ▁Over view ▁of ▁un gram mat ical ity ▁E scher ▁sentences ▁are ▁un gram mat ical ▁because ▁a ▁matrix ▁clause ▁subject ▁like ▁more ▁people ▁is ▁making ▁a ▁comparison ▁between ▁two ▁sets ▁of ▁individuals , ▁but ▁there ▁is ▁no ▁such ▁set ▁of ▁individuals ▁in ▁the ▁second ▁clause . ▁For ▁the ▁sentence ▁to ▁be ▁gram mat ical , ▁the ▁subject ▁of ▁the ▁second ▁clause ▁must ▁be ▁a ▁bare ▁pl ural . ▁L ingu ists ▁have ▁marked ▁that ▁it ▁is ▁" st rik ing " ▁that ▁despite ▁the ▁grammar ▁of ▁these ▁sentences ▁not ▁possibly ▁having ▁a ▁meaning ful ▁interpretation ▁that ▁people ▁so ▁often ▁report ▁that ▁they ▁sound ▁acceptable , ▁and ▁that ▁it ▁is ▁" remark able " ▁that ▁people ▁s eld om ▁notice ▁any ▁error . ▁ ▁History ▁ ▁Mario ▁Mont al b etti ' s ▁ 1 9 8 4 ▁Massachusetts ▁Institute ▁of ▁Technology ▁dis sert ation ▁has ▁been ▁cred ited ▁as ▁being ▁the ▁first ▁to ▁note ▁these ▁sorts ▁of ▁sentences ; ▁in ▁his ▁pro log ue ▁he ▁gives ▁acknowled g ements ▁to ▁Hermann ▁Sch ult ze ▁"