The real reason he abruptly halted the study, then, was likely because of results that Kellogg never anticipated: his son Donald started imitating the chimp.
For example, though Donald had learned to walk before Gua joined the Kellogg family, he regressed and started crawling more, in tune with Gua. He'd bite people, fetch small objects with his mouth, and chewed up a shoe. More importantly, his language skills were delayed. At 19 months, Donald's vocabulary consisted of three words. Instead of talking he would grunt and make chimp sounds.
Gua got sent back to the Yerkes center in Florida, where she promptly died. And Donald? Not much is known of his life, but, at 43, he committed suicide.
This study got a lot of press when it was published, but Kellogg ended up deeply regreting it -- not because of what it did to his son, but because it prevented him from being taken seriously as a scientist.
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