▁The ▁evolution ▁rule ▁is ▁as ▁follows : ▁▁ ▁If ▁ ▁then ▁. ▁ ▁If ▁ ▁then ▁▁▁ ▁If ▁ ▁and ▁ ▁for ▁some ▁neighbor ing ▁cell ▁ ▁then ▁. ▁ ▁Otherwise , ▁ ▁Rel ation ▁to ▁a ▁model ▁of ▁Wiener ▁and ▁Rosen bl u eth ▁While ▁the ▁G H ▁model ▁has ▁often ▁been ▁compared ▁with ▁the ▁ground ▁breaking ▁model ▁of ▁Wiener ▁and ▁Rosen bl u eth ▁ ▁developed ▁earlier ▁for ▁the ▁same ▁purpose , ▁the ▁anal ogy ▁is ▁incorrect ▁because ▁the ▁latter ▁is ▁not ▁a ▁CA . ▁See ▁for ▁example , ▁in ▁which ▁it ▁is ▁stated ▁that ▁" The ▁organization ▁of ▁mus cle ▁cells , ▁the ▁contra ction ▁of ▁mus cle , ▁the ▁dependence ▁of ▁the ▁activity ▁of ▁the ▁medium ▁on ▁the ▁activity ▁of ▁its ▁component ▁elements , ▁problems ▁of ▁memory , ▁reli ability , ▁and ▁mob ility ▁were ▁form ulated ▁by ▁Wiener ▁in ▁the ▁form ▁of ▁definitions ▁and ▁the or ems ▁for ▁a ▁three - phase ▁threshold - in variant ▁continuous ▁exc itable ▁medium ." ▁Even ▁this ▁statement ▁is ▁mis leading , ▁however . ▁By ▁reading ▁the ▁original ▁paper ▁ ▁carefully , ▁it ▁can ▁be ▁seen ▁that ▁neither ▁the ▁time , ▁the ▁medium , ▁nor ▁the ▁state ▁are ▁discrete . ▁This ▁is ▁immediately ▁obvious ▁as ▁regards ▁the ▁time ▁and ▁the ▁medium . ▁ ▁Wiener ▁and ▁Rosen bl u eth ▁do ▁say , ▁though , ▁ ▁that ▁" There ▁are ▁three ▁conditions ▁in ▁which ▁any ▁given ▁region ▁of ▁the ▁fi ber ▁can ▁exist ." ▁They ▁name ▁these ▁as ▁the ▁" active ", ▁the