Comment by eggie

It seems unlikely to me that biological systems wouldn't exploit digital (e.g. genomic/DNA/RNA) kinds of memory storage, given that the materials are there and the energy costs of maintaining and accessing that kind of storage can be fantastically low. Keeping memory alive in neural circuits would seem much more difficult. Surely that's happening to a large degree though. I'm just highlighting the possibility of an alternative basis for certain kinds of memory in the brain.