Do we think that the bottleneck bit rate (i.e. our learning speed) has varied with human evolution

It might have:
1. Slowed due to the greater complexity of our simulations as we developed a more sophisticated model of the world, or

2. Speeded up due to our increased processor volume (brain size) + greater facility for multitasking, or

3. Stayed the same because the basic underlying biological mechanism evolved to an optimum early in our evolutionary time scale, and it is still limited by that factor.

Richard