Before revision:  These results support our assumption that concept formation is essential for continuous lifelong learning , and suggest the AVIM we propose here is a possible mechanism of concept formation , and hence is a brain-like solution to the problem of catastrophic URLetting .
After revision:  These results support our assumption that concept formation is essential for continuous lifelong learning , and suggest the proposed AVIM is a possible mechanism of concept formation , and hence is a brain-like solution to the problem of catastrophic URLetting .