▁a ▁series ▁of ▁images ▁(= activ ation ). ▁The ▁dream er ' s ▁sleep ing ▁conscious ness ▁automatically ▁tries ▁to ▁integrate ▁these ▁images ▁into ▁a ▁more ▁or ▁less ▁coh er ent ▁story , ▁while , ▁for ▁example , ▁linking ▁them ▁with ▁fragments ▁of ▁memory ▁from ▁the ▁past ▁(= syn thesis ). ▁( Sim ilar ▁mechan isms ▁involving ▁the ▁P GO ▁imp uls es ▁have ▁been ▁incorpor ated ▁into ▁other ▁dream ▁models , ▁namely ▁Francis ▁Cr ick ▁and ▁Gra eme ▁Mitch ison ' s ▁reverse ▁learning ▁theory ▁and ▁Michael ▁J ouv et ' s ▁end ogen ous ▁learning ▁hypothesis .) ▁▁ ▁The ▁activation - syn thesis ▁hypothesis , ▁although ▁based ▁on ▁ne uro log ical ▁data ▁more ▁advanced ▁than ▁was ▁ever ▁available ▁to ▁Fre ud , ▁is ▁rem in is cent ▁of ▁Fre ud ' s ▁ps y cho anal yt ic ▁model ▁in ▁that ▁the ▁initial ▁input ▁to ▁the ▁process ▁is ▁primitive ▁and ▁cha otic , ▁onto ▁which ▁some ▁order ▁in ▁im posed ▁by ▁a ▁cogn it ively ▁more ▁advanced ▁process . ▁But ▁as ▁for ▁the ▁psych ological ▁interpretation ▁of ▁dream s ▁the ▁authors ▁of ▁the ▁activation - syn thesis ▁hypothesis ▁are ▁out sp oken ly ▁anti - Fre ud ian , ▁in ▁that ▁in ▁their ▁model ▁the ▁initial ▁input ▁to ▁the ▁dream ing ▁process ▁( the ▁P GO - imp uls es ) ▁are ▁de void ▁of ▁any ▁depth - ps ych ology ▁significance , ▁O ed ip al ▁or ▁whatever . ▁( If ▁the ▁dream ▁acqu ires ▁any ▁significance ▁rel ating