On cognitive load

I’ve been thinking recently about cognitive load theory (CLT), a theory founded by John Sweller in the 1980s. Bear with me. I’m not intending to use seductive sounding terms like ‘cognitive architecture’; or to suggest that I am an expert on CLT; or to delve into discussions about intrinsic, extraneous and germane cognitive load; or to articulate the problems with self-ratings of perceived mental effort. This is more of a loose layperson’s pondering around the effects of the influence of new information on working memory.

CLT posits that human working memory cannot process many new elements at any one time. A couple of weeks ago I moved house and the resulting chaos had me realising the effects of putting a heavy load of novel information onto the working memory. Despite the mundanity of the challenges of moving into a new home (whitegoods don’t fit, furniture doesn’t work spatially, boxes crowd in threateningly, kids don’t sleep well, the house makes strange noises), in the first week at our new place I left my yoga clothes at home once and left my phone at home twice. I was constantly struggling to remember where I had to look to find plates, cling film, toiletries, members of my family. I had no sense of routine or stability.

For me, the mental work of existing somewhere new, without the automaticity that comes with entrenched habit (or, as cognitive load theorists might call it, cognitive schemata in my long term memory) was immense and intense. I felt that I was living in a fog, and existing at about 40% of my usual capacity. The simplest of tasks were arduous, time consuming, and took what seemed like excessive cognitive effort. My husband asked me what was wrong with me; I knew that the relocation had taken my working memory beyond its capacity to cope. I was moving as through wet concrete. I felt displaced.

Now, learning a new house isn’t the same as learning new, complex, domain-specific skills (although I could talk long and hard about the gurgling of the fishpond interrupting sleep, the mental effort required to drive in the right direction home from work, and the impossibility of finding a sensible place for everything in a new kitchen). No doubt there were aspects of my experience that were environmental and affective as well as cognitive. Yet, the disorder and discombobulation I felt in my first week in my new house were a stark reminder of what students might feel when confronted with new content in a classroom with which they are not yet familiar, or with a skill that they might approach without the appropriate embedded prior knowledge and automation required to succeed.

As Greg Thompson has recently blogged (channeling Derrida’s student Bernard Stiegler), writing (like this blog post) can construct a mental prosthesis, a kind of corporeal residue of an experience that, left to the memory, would fade in intensity over time. Unlike Greg in his story of being concussed in Banff, I will have no physical remnants of moving house, nor any of the entertainment value of the story. No doubt soon the uneasiness will fade into that vague unnoticed feeling of being at home in instinctive motion.

In this post on the doctorate I reflect that:

Once we have learned something, we cannot always remember what it was like to not know it, making it difficult to teach or help someone. By (b)logging my writing memories as they happen, perhaps I can archive my not-so-good-at-academic-writing self. Reflecting-on-writing by writing-about-writing – in a kind of meta-writing – helps me to document my academic writing journey. … blogging helps me to have a Hansel-and-Gretel breadcrumb trail back to my less capable self.

As someone becomes more expert, they often ‘black box’ their expertise, as Pamela Hinds explains in her 1999 paper ‘The Curse of Expertise’. Experts are unable to accurately predict the time and difficulty novices need to complete a task. Intermediate learners, Hinds finds, are more helpful for novices as they still remember and understand the problems of being a beginner. This is something I wonder about in terms of academia as well as teaching. Do doctoral supervisors ‘black box’ the PhD or EdD experience? Are they able to break down the steps of the doctorate for their students, or are veteran professors too far removed from the struggle and journey of the neophyte researcher? In a classroom, do teachers expert in their subjects have the capacities to break down the content and skills into accessible enough elements for struggling learners? Can an expert coach can break down the steps of coaching once they have internalised the philosophies, knowledge, and processes? Once the work of the mind is internalised and automated, much mindfulness and precision are needed if we are to teach others. Expertise may be a curse, but my house move has reminded me of the curse of the beginner. I yearn for repetitious automation.

So, as I use the daily practice of living in my new house as a way to build a long term memory schema, I am beginning to relax. Nothing yet feels automatic or fluid—and I still feel the newness and unfamiliarity of my surroundings—but I know that at some point I will forget the uneasy, cognitively prickly effort that came with moving house. I’ll happily float through the new place on auto-pilot, even in the dark of night or the first sleepy moments of the morning.