Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sparse distributed representation, hierarchy, critical periods,
  metaplasticity: the keys to lifelong fixed-time learning and best-match
  retrieval   Among the more important hallmarks of human intelligence, which any
artificial general intelligence (AGI) should have, are the following. 1. It
must be capable of on-line learning, including with single/few trials. 2.
Memories/knowledge must be permanent over lifelong durations, safe from
catastrophic forgetting. Some confabulation, i.e., semantically plausible
retrieval errors, may gradually accumulate over time. 3. The time to both: a)
learn a new item, and b) retrieve the best-matching / most relevant item(s),
i.e., do similarity-based retrieval, must remain constant throughout the
lifetime. 4. The system should never become full: it must remain able to store
new information, i.e., make new permanent memories, throughout very long
lifetimes. No artificial computational system has been shown to have all these
properties. Here, we describe a neuromorphic associative memory model, Sparsey,
which does, in principle, possess them all. We cite prior results supporting
possession of hallmarks 1 and 3 and sketch an argument, hinging on strongly
recursive, hierarchical, part-whole compositional structure of natural data,
that Sparsey also possesses hallmarks 2 and 4.

3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con