We've now talked about at least 3 memory systems: sensory, working, long-term. This is just the start of how psychologists like to partition the workings of the brain. We can also then divide long-term memory into 2 or 3 more systems. And, one of these could be further subdivided. These subdivisions result from psychologists observing different memory patterns under different conditions (e.g., Clive Wearing's STM impairment, but sparing of LTM).
My question is: does the brain really have all of these working subsystems or is there just one system -- like one big neural net? An argument could be made that implicit and explicit memory are the same beast but one is slightly more complex than the other. So, are we just creating these subsystems because this is the only way WE can understand the brain given our current state of knowledge about the brain?