I want to report on the extremely enthusiasming results a team, Julia Watzek, Sarah Pope and Sarah Brosnan, that experimentally (computer test) showed a lack of cognitive bias in monkeys (Capuchin monkeys) in a test comparing them to humans.
Julia Watzek et al. Capuchin and rhesus monkeys but not humans show cognitive flexibility in an optional-switch task, Scientific Reports (2019). DOI: 10.1038/s41598-019-49658-0
It should also be noted that they also offered the same test in zoos to customers and children were four times as performing as adults. (indeed the bisexual naturalness is still obvious in babies, which is why it became evident to Freud and Fliess that “human babies are all naturally bisexual”)
These results obviously show the progressive self-repression of the bisexual naturalness which closes the mind and hence reduces cognitive abilities together with a closure to parts of the innate sexuality ; progressive self-repression which society, culture, and most human families encourage and which does not exist in animals. (as explained in my book, first chapter)