▁of ▁language ▁dependency ▁relations ; ▁and ▁a gram mat ism , ▁the ▁fault y ▁construction ▁of ▁complex ▁sentences ); ▁and ▁just ▁under ▁one ▁fifth ▁as ▁dis orders ▁of ▁thought . ▁Although ▁it ▁was ▁well ▁known ▁at ▁the ▁time ▁that ▁the ▁speech ▁of ▁normal ▁people ▁in ▁w ake ful ness ▁is ▁often ▁fra ug ht ▁with ▁errors , ▁Kra ep elin ▁pri zed ▁his ▁cor pus ▁of ▁devi ant ▁dream ▁speech ▁for ▁the ▁prof ound ▁nature ▁of ▁many ▁of ▁the ▁errors ▁they ▁contained , ▁different ▁from ▁the ▁common ▁sli ps ▁of ▁the ▁tongue ▁made ▁by ▁ment ally ▁health y ▁people ▁in ▁every day ▁life . ▁He ▁li ken ed ▁various ▁spec im ens ▁of ▁his ▁dream ▁speech ▁cor pus ▁to ▁the ▁speech ▁in ▁w aking ▁life ▁of ▁patients ▁with ▁de ment ia ▁pra ec ox ▁( sch iz op hren ia ), ▁speech ▁confusion , ▁and ▁a phas ia . ▁Kra e pl in ▁saw ▁his ▁dream ▁experiences ▁as ▁aff ording ▁him ▁( a ▁normal ▁person ) ▁first - hand ▁insight ▁into ▁these ▁path ological ▁processes . ▁He ▁further ▁spec ulated ▁on ▁ne uro log ical ▁con com itants ▁involving ▁the ▁activities ▁and ▁interaction ▁of ▁areas ▁of ▁the ▁brain — the ▁c ere br al ▁cor tex , ▁W ern ic ke ' s ▁co il , ▁Bro ca ' s ▁co il — which ▁are ▁different ▁from ▁in ▁normal ▁w ake ful ness . ▁Although ▁several ▁of ▁Kra ep elin ' s ▁dream ▁speech ▁spec im ens ▁are ▁am enable ▁to ▁interpretation ▁for