Why is synaptic plasticity not enough?

Why is synaptic plasticity not enough? Neurobiol Learn Mem. 2020 Oct 30;:107336 Authors: Hansel C, Disterhoft JF PMID: 33137462 [PubMed - as supplied by publisher]
Source: Neurobiology of Learning and Memory - Category: Neurology Authors: Tags: Neurobiol Learn Mem Source Type: research