My sons find it amusing that my iPod Nano has no music but around
500 podcasts, many from In Our Time
on Philosophy, History, Religion and Science. Why? Because I travel a lot and
like to keep myself stimulated on trains, planes and in other non-places. Like
reading, I find the focus on one medium useful, especially for knowledge and
reason. So here’s some reflections on my
audio experience.
1. Doubles productivity
Paul Maharg has developed some superb online, simulation
tools for lawyers but one thing in his toolset did catch my eye. He has a
‘fastalk’ button for listening to audio/video faster than normal speed. This
may sound trivial but it’s not. My iPod Nano also has a x2 button that allows
you to listen at twice natural speed. As we read at about twice the speed we
speak, this means that I can listen at reading speed. In terms of productivity,
I HALVE talking time. Let’s apply that rule to lectures. If I listened to
recorded lectures at twice the speed, I’d be doubling my productivity. Alternatively,
I could listen to the lecture twice in the same time, which will dramatically
increase retention through reinforcement. Either way there’s an enormous boost
in productivity. Note that one study saw no significant difference in retention at double and even triple speed. Indeed, listening skills seemed to improve.
2. Review button
The ‘replay last thirty seconds’ button is also a godsend.
If you miss a word, phrase, number or simply want to hear the point again, it’s
easy. How often do students ask real lecturers to repeat something they hadn’t
caught or understood? This instant review button is made for learning (quite
aprat from pause, return to point from which you left, rewind and fast forward).
3. Note taking easier & better
I also take notes when listening to these podcasts. With just
earphones and an iPod, my arms are free. It allows me to focus on the screen
while I type or page when I write. If I’m looking at a lecturer this, as anyone
who has tried to take notes in a live lecture knows, is difficult. And as we
know that good note taking increases retention by 20-30%, there’s another
productivity boost. Indeed, I find that the spare cognitive capacity, created by
not having a live lecturer, allows me to write notes well, and in my own words,
which is even more useful.
4. Avoids visual distraction
So is there any real reason to video the lecturer? I think
not. Khan stays out of his videos as does Thrun in his Stanford content. They
both state that this is a deliberate move and I’m glad. I don’t need to see
their face to understand what they’re saying. For knowledge and reason that is
primarily semantic, I find the purity of audio, like text in reading, ideal. Images
and video are, if anything, a distraction. In terms of retention this type of
knowledge is stored in semantic, not episodic, memory. That’s not to say that
imagery doesn’t help in elaboration. However, the best form of elaboration for
this type of knowledge is that produced by the imagination.
5. Imagination kicks in
When it comes to semantic memory, and knowledge of this
type, freeing my working memory from ‘looking’ at a lecturer, also allows my
imagination to kick in. This brings my own existing knowledge and thoughts to
the act of learning, which I have no doubt increases elaboration and therefore
retention and recall.
6. Audio easy to record & distribute
Audio is, of course, cheap and easy to record. Unlike video,
you don’t have to worry about lighting and movement. Video files are many times
larger than audio files, therefore easier and cheaper to store and distribute,
especially on mobile media. Just kick that stuff out through iTunes and you’re
up and running.
7. Audio convenient on the move
Given the ease of production and distribution, it’s an ideal
form of mobile learning. All you need is a mobile or iPod and earphones. My
Nano is literally as small as a watch (indeed it can be worn as a watch),
weighs just a few ounces and can be attached to my lapel.
Conclusion
So audio can double productivity at double speed (or listen
to twice) compared to actual lectures, can be reviewed, allows productive and
meaningful note taking, eliminates visual distraction, stimulates the internal imagination
and therefore retention, is easy to record, easy to distribute and perfect for
mobile learning. That’s before we even get to the 24/7 access. On productivity, my claim that this approach 'doubles' productivity applies to the mathematically certain fact that you save half the time. That doesn't mean you've been twice as productive in retention. Here, however, the fact that you can take notes gives an evidence-based boost of 20-30%. That combined with the use of your imagination to elaborate the learning and listening to it twice, boosts retention even further, as does the absence of visual distraction. The claim of 100% increase in retention, is therefore, approximate but credible.