re:
Larry Summers' claim that "in a world where the entire Library of Congress will soon be accessible on a mobile device with search procedures that are vastly better than any card catalog, factual mastery will become less and less important":
The reason factual mastery has not and will not become less important is that
it is not possible to think about something that is on Google.
Seriously.
While you are thinking about something, that something has to be lodged inside your working memory, not on Google.
And your working memory is tiny.
How tiny?
This tiny:
Working memory storage capacity is important because cognitive tasks can be completed only with sufficient ability to hold information as it is processed. [emphasis added] The ability to repeat information depends on task demands but can be distinguished from a more constant, underlying mechanism: a central memory store limited to 3 to 5 meaningful items in young adults. [emphasis added]
The Magical Mystery Four: How Is Working Memory Capacity Limited, and Why?
Nelson Cowan
I hit this limit all the time trying to write about topics that are new to me. The
basal ganglia, for instance. For well over a year, I have been endlessly working and re-working a project on the
basal ganglia, a subject I knew essentially nothing about going in.
I was not able to write about the basal ganglia until I actually
learned about the basal ganglia:
learned as in committed the material I was trying to write about to (long-term) memory. It didn't matter how many times I looked up
basal ganglia on the internet. I looked up the
basal ganglia a lot, as a matter of fact; then I forgot whatever it was I had looked up while I was thinking about something
else to do with the
basal ganglia, which meant I had to go look up
basal ganglia again. And again and again.
Try it if you don't believe me.
Here are some items related to the
basal ganglia:
dorsal striatum
ventral striatum
putamen
nucleus accumbens
ventral tegmental area
orbital frontal cortex
dopamine
two pathways
OCD
addiction
habit
impulsive
compulsive
intuition
probabilistic learning
associative learning
serotonin
orbitofrontal cortex
cortico-striatal circuit
Now supposing I gave you two-line definitions of these 19 items and asked you to write a coherent, reasoned 5-paragraph essay on the basal ganglia: what it is and what it does. Just a quick summary organized into 3 coherent paragraphs.
You couldn't do it. You couldn't do it because every time you wrote about the ventral striatum, the dorsal striatum, and the OFC, you would forget the VTA and the putamen -- and you would forget the VTA and the putamen because your working memory will hold only 3 to 5 things at a time. Something has to go.
That's what happened to me
when I took a calculator I didn't know how to use to the SAT. Each time I swapped the steps for using the calculator
into working memory, my brain swapped the information for the problem I was doing back
out of working memory. Then, when I tried to cram the information for the problem back into working memory while holding onto the calculator steps, I couldn't do it.
I could remember the problem, or I could remember how to work the calculator, but I couldn't remember both at the same time. Too much information, literally.
That experience illustrates the reason why we need to practice until we learn content and skills to '
automaticity.' (Another
basal ganglia term! Add it to the list!) Once you've learned something so well you don't have to think about it, you free up working memory -- consciousness -- to hold other things.
I repeat:
You can't think about something on Google.
You can't think about something on a piece of scratch paper.
You can only think about content that is currently lodged inside your working memory, and your working memory holds only 3 to 5 separate items ------ UNLESS you are an expert (or no longer a novice) in the subject you're trying to think about, in which case you have "chunked" the information so that "dorsal striatum" and "ventral striatum" are now just one item instead of two.
To a highly gratifying degree, I can now think about all 19 items on the
basal ganglia list at the same time. I can think about all 19 at the same time because I have learned enough about the
basal ganglia that the items have become connected in my long-term memory. The 19 are no longer 19 separate items but probably closer to 2 or 3.
If our schools are going to ask students to 'think' about material they haven't learned, students are going to be thinking about 3 to 5 small, not-well-elaborated items at a time. Period. Their thinking will be superficial, and the conclusions they reach will be superficial, too.
Which is exactly what we see in Larry Summers' op-ed about education, a field in which he is neither expert nor learned.
and see:
Superior Memory of Experts and Long-Term Working Memory (LTWM)
extremely fast learning & extended working memory