About this video

Observe the following typical training sessions for yourself in real time.  Observe them again, in slow motion, consulting the written narrative.  You will be able to verify the above statements for yourself.
As you see additional video of other apes using symbols and communicating nonverbally,  the limitations placed upon Nim by the project's preoccupation with how Nim ought to behave, rather than attempting to understand how he did behave, will become self-evident.