# What still needs to be understood about the 2/3 layer of the neocortex?

**URL:** https://discourse.numenta.org/t/what-still-needs-to-be-understood-about-the-2-3-layer-of-the-neocortex/4205
**Category:** General Neuroscience
**Created:** [July 16, 2018, 5:39pm UTC](https://discourse.numenta.org/t/what-still-needs-to-be-understood-about-the-2-3-layer-of-the-neocortex/4205 "2018-07-16T17:39:48Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![nbro](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.numenta.org/nbro/32/2864_2.png) [@nbro](https://discourse.numenta.org/u/nbro)
#### Post date: [July 16, 2018, 5:39pm UTC](https://discourse.numenta.org/t/what-still-needs-to-be-understood-about-the-2-3-layer-of-the-neocortex/4205/1 "2018-07-16T17:39:48Z")

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Jeff Hawkins states, in this [video/presentation](https://www.youtube.com/watch?v=6ufPpZDmPKA), that, [according to him, “we” (I suppose, “we”, the humans) understand about 98% of the 2/3 layer](https://www.youtube.com/watch?v=6ufPpZDmPKA&t=34m18s), where, according to the HTM theory, high-order inference occurs. _Why 98%?_ Please, answer this question only if you’re Jeff Hawkins or you have a very good understanding of the HTM and neuroscience. (Note: I have almost no knowledge of neuroscience, so keep that in mind, but be rigorous.)

He also says that there are [a few things that need to be reviewed and cleaned up](https://www.youtube.com/watch?v=6ufPpZDmPKA&t=34m36s). _What are these things?_

I suppose that the estimate may have changed meanwhile. If you’re very qualified to answer this question about the new estimates, new updates about our knowledge regarding this 2/3 layer, then you can answer.

**Please, no speculation. Answer only if you’re really qualified to answer my questions. And, please, stay on topic!!**