▁and ▁cr ick ets ▁in ▁Se ew iesen ▁( He il igen berg ▁ 1 9 6 5 ; ▁Heil igen berg ▁ 1 9 6 9 ), ▁successfully ▁conduct ing ▁a ▁quant itative ▁demonstr ation ▁of ▁the ▁" law ▁of ▁heter ogeneous ▁summ ation ," ▁whose ▁model ▁predicted ▁that ▁" d ifferent ▁features ▁of ▁a ▁stim ulation ▁in ▁a ▁[ led ] ▁to ▁an ▁independent ▁behavior al ▁stim ulation ▁in ▁the ▁receiver " ▁( Z up anc ▁and ▁Bul lock ▁ 2 0 0 6 ). ▁ ▁Much ▁of ▁his ▁work ▁eventually ▁led ▁to ▁the ▁testing ▁and ▁production ▁of ▁evidence ▁contrary ▁to ▁Lor enz ' s ▁theory ▁of ▁the ▁psych oh yd ra ul ic ▁model ▁of ▁motiv ation ▁( specific ally ▁ag gression ) ▁using ▁male ▁Ch ic l idae ▁( Z up anc ▁and ▁Bul lock ▁ 2 0 0 6 ). ▁ ▁Such ▁was ▁his ▁willing ness ▁to ▁vent ure ▁into ▁new ▁ne uro eth ological ▁territ ories ▁despite ▁the ▁established ▁research ▁at ▁the ▁time . ▁ ▁His ▁status ▁as ▁ne uro eth ologist ▁became ▁further ▁established ▁when ▁he ▁moved ▁to ▁the ▁S cri pp s ▁Institution ▁of ▁Ocean ography ▁at ▁the ▁University ▁of ▁California , ▁San ▁Diego ▁( UC SD ), ▁in ▁ 1 9 7 2 ▁as ▁a ▁post - do ctor al ▁investig ator ▁in ▁The odore ▁Hol mes ▁Bul lock ' s ▁labor atory ▁( C arr ▁ 1 9 9 4 ). ▁ ▁His ▁appointment ▁to ▁fac ulty ▁in ▁ 1 9 7 3