Harry Harlow's 'Cloth Mom gone Psycho, Evil Mothers' rhesus monkey experiment
Channel: Visceral Gravitas
Date: 2022-10-31

Harlow found that young monkeys reared with live mothers and young peers easily learned to play and socialize with other young monkeys. Those with cloth mothers were slower, but seemed to catch up socially by about a year. Babies raised with real mothers but no playmates were often fearful or inappropriately aggressive. Baby monkeys without playmates or real mothers became socially incompetent, and when older, were often unsuccessful at mating. Those unsocial females that did have babies were neglectful of them. 

excerpt from https://youtu.be/O81rk19Z__w

transcript: 
one of his most controversial experiments and most painful and and in its way equally revolutionary was what you know cloth mom gone psycho the evil mothers 
the evil mothers looked identical to the cloth models that Harlow had been using for many years 
but these mothers were not impassive some blasted the baby monkeys with violent Jets of air 
others jabbed at them with metal spikes 
when the distraught infant would clutch the fake mother 
these spikes would come out and repel the infant

for Harlow having established the love the baby monkeys had for their surrogate mothers 
this was his way of finding out if that love could be destroyed 
finding out if that love could be destroyed 
oh they predicted they were going to get some pretty messed up sort of psycho monkeys 
they didn't really see the 
what they saw was babies always went back babies always went back 
for Harlow this was a revelation that offered a powerful insight into human relationships 
it was proof that however badly a mother behaved 
the child would always return to her in search of love 
just as we know with abusive real human mothers rejecting and often punitive mothers don't indeed Produce Independence 
they often produce exactly the opposite 
babies always went back