Interesting fact of the day: Both dogs and wolves start to display object permanence at about the same time in their development (5b object permanence at ~11 weeks).
By comparison humans start to show stage 5b object permanence around 12 to 18 month.
@LouisIngenthron similar order of magnitude yea.
@freemo It has greater variation in some humans. Looking at managers, many don't develop object permanence at all - if they don't see you working, they assume you don't!
@freemo Sounds about proportional to our relative lifespans and childhood age ranges.