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As I discussed in the last column in this series, Columbia’s heavy reliance on the lecture is a disservice to its students– the ‘learning’ happening in a traditional lecture isn’t translating to long-term memory. Evidence going back over a hundred years tells us that the typical memorize-and-regurgitate approach most students employ to get through a lecture course is an astonishingly bad way to learn – when tested six months after completing a typical lecture course, students have reliably forgotten ~95% of the information they learned.1
While completely replacing lectures with core-sized classes is the obvious suggestion, it’s likely too expensive to execute, even for a well-endowed school like Columbia. Instead, I’m going to focus on easy, relatively cheap, and scientifically effective ways to improve the lecture-based classroom by using what we know about how humans form memories.
While there are few different kinds of memory, the type most relevant to higher education is declarative memory – that which can be consciously accessed. This long-lasting memory we’re going after involves four steps: encoding new information, storage, retrieval, and forgetting. Over the next four columns, we’ll be exploring each of these areas in detail, starting with how we initially process new information.
The standard Columbia lecture requires you to pay attention to the lecturer speaking for 75 minutes straight, often followed by short break and yet another 75-minute information deluge if you, like me, have the misfortune of back-to-back lectures. Empirical research into attention span during lecture courses suggests that students pay attention for less and less time in ever-shortening cycles. The longer a lecture goes on, the less students pay attention, and the bigger each lapse in attention gets.2
Here’s a common story that plays out in lectures across Columbia. You walk into a lecture ready to learn, pay attention for fifteen minutes…and then spend a minute checking Facebook. You tune back in, maybe for only ten minutes this time, only to be distracted for a three-minute stretch by your group chat. By the end of the lecture, you’re only spending two or three out of every ten minutes actually listening, and the rest of it distracted and hoping the lecture ends.
The neurological reason for these lapses comes from the ‘top-down’ way your conscious brain focuses on a single thing for an extended period of time. Your prefrontal cortex, which is physically located on top of the rest of your brain tells the lower, more primitive parts of your brain to shut up and allow you to focus on a specific task. That’s what lets you listen to your professor while tuning out all irrelevant stimuli, like your phone buzzing in your pocket, your stomach rumbling, or that siren wailing past on Broadway.
This kind of conscious selection is necessary to even hearing new information in the first place – if you’re not paying attention, you won’t be able to recall the information later. But forcing your brain to do this for an extended period of time comes at a steep neurological cost. Overuse of these suppression mechanisms leads to mental fatigue – effectively preventing your brain from focusing any more. Any further attempt to focus only makes it worse, and you’re prone to completely tuning out and giving up on paying attention at all.3 The 75-minute lecture is excellent at causing just this sort of dangerous mental fatigue,4 and far from being the best, it’s possibly one of the worst ways of introducing information.
Instead of using time in-class to relay new information, students would benefit most from having control of their initial information encoding. Students could choose the type of input they prefer, whether that be pre-recorded lectures, readings, compellingly explained visuals, interactive formats, or a combination different methods. Imagine if you could take a pause when your attention slips, going back over difficult concepts a few times, and skim quickly those you already understand. The idea of doing this sort of learning as ‘homework’ has a number of other benefits.
The idea of doing initial learning before class is called flipping the classroom, and it’s one of the most scientifically-supported ideas for improving lecture courses.5 To solve our lecture attention problem, the best idea may be to trust the intelligent and motivated Columbia students to learn at their own pace and think about the material first, before even walking into a classroom.
By flipping the classroom, we’ll be able to better pay attention to new information, and therefore be better prepared for the next stage of memory formation. Importantly, it frees up valuable in-class time to use more interactive teaching techniques, which is necessary if we want to improve the storage and recall phases of memory.
Stay tuned for the next column, where we’ll talk about how to most effectively use time spent physically in the classroom to help Columbia students actually learn from their lecture classes.
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- Deslauriers, L. & Wieman, C. (2011). Learning and retention of quantum concepts with different teaching methods. Physical Review Special Topics – Physics Education Research, 7.
- Bunce, D., Flens, E., & Neiles, K. (2010). How Long Can Students Pay Attention in Class? A Study of Student Attention Decline Using Clickers. J. Chem. Educ., 87(12), 1438-1443.
- Ishii, A., Tanaka, M., & Watanabe, Y. (2014). Neural mechanisms of mental fatigue. Reviews In The Neurosciences, 0(0).
- Aron, A. (2007). The Neural Basis of Inhibition in Cognitive Control. The Neuroscientist, 13(3), 214-228.
- Roehl, A., Reddy, S., & Shannon, G. (2013). The Flipped Classroom: An Opportunity To Engage Millennial Students Through Active Learning Strategies. Journal Of Family & Consumer Sciences, 105(2), 44-49. http://dx.doi.org/10.14307/jfcs105.2.12