Which study was it about the monkey who was taken away from his mother and only given a sock puppet to hold? That story breaks my heart, too. Not as bad as the Romanian orphans, but it's still sad when you know what the research showed.
ETA: Nevermind. Found it. Link.
Re: Jenerally or anyone who studied psych
https://en.wikipedia.org/wiki/Harry_Harlow
I rememer this from Psych 101. Poor wire monkey momma.