Left is the slightly more complex model of working memory I now want to consider. It does not include one important element of the process. That is the sensory data ALL goes into the brain and causes neuron changes. But it is good enough, I think.
Any model has limitation and will eventually fall down if pushed to explain some part of the system it is modelling. All models are attempts at simplifying reality. Think of a model train set that runs in my large loft. It models the timetable from Kings Cross to Hatfield almost perfectly. Great model for the timetable function of the real thing. But when a train, on my model, falls off the track I just lift it up and put it back. NO massive response from the emergency services as there would be for a derailed train in the real world. My model train layout does not even try to model this aspect of the railway.
The clever thing is to use the model with just the right amount of complexity/simplicity to be able to model the features then one needs to have to explore the system.
There are several models of working memory and the constraints and opportunities offered by these models critically affects the way we can think about learning. Cognitive load is a critical feature and one which some teachers who have certain beliefs about learning, I will not label them but if you are not using the ideas of working memory explicitly or implicitly to help you decide on how learning can happen efficiently and effectively then you are, I think, ignoring a critical feature of how we learn. I think you will get your own model of learning wrong.
I am indebted to Sue Gerrard for firstly putting up with me on twitter and then spending a little time with me, live, at ResearchEd in Birmingham to explain why the model that Willingham, and I, had been using was more limited and might then have some distortion in our understanding of learning. I now think I understand the model she prefers. A version of the more sophisticated appears above.
You might like to compare this with the simpler model that Willingham and other use. It is the role of attention, for me in my present very novice state of thinking, that is making me rethink working memory and it’s role in learning.
The features that are different from the possibly too simplistic Willingham and others model are:
- Information from the environment into the brain is NOT limited by working memory. All the information that we collect, sense, through our senses enters our brain and changes the brain neuron structure. In one sense our brain ‘learns’ continuously.
- We also sense internal changes in our body continuously and these changes, feelings, reactions also change the brain structure. This all goes on the background.
- Although all our sensory inputs enters our brain is is not, by any means, accessible or retrievable. As teachers we are critically interested in learning that is retrievable.
- Attention is the device that can select particular items from the massive stream of input from our senses.
- It is NOT true that all the sensory input goes through working memory. This is, I think, a critical issue which is not shown by the Willingham model.
- There are different types of memory. I have not got to grips well enough to write about this, yet. But I will.
It is the function of this attention that is making me rethink whether the Willingham model is complex enough to allow us to think about learning (tests type) as teachers. And the different types of memory will also have an impact, though that is just a gut feeling at the moment.
- How to ensure we do not distract them?
- How do we ensure that their attention does not focus on something which is not important for the learning we want to happen?
As a note: The word ‘learning’ seems to be used differently from the way I and some teachers would use it. For me learning is the thing that gets tested when children do an exam, or use to solve problems etc. In the brain world learning seems to be any change to the brain that is as a result of sensory input. I’ll try and be clear which version of the word I am using.
There is a choice. My attention is being pulled in two directions. Rugby or more blogging.
Rugby won! More later.