Short-Term Memory
Short-term memory is a very handy thing. It helps us remember where we set our keys or where we left off on a project the day before. Think about all the aids we employ to help us with short-term memory: you may hang your keys in a particular place each evening so you know exactly where they are supposed to be. When you go grocery shopping, do you ever choose a product because you recall an advertising jingle? You see the box of cereal and you remember the song on the TV commercial. If that memory causes you to buy that product, the advertising worked. We help our memory along all the time, which is perfectly fine. In fact, we can modify these everyday examples of memory assistance for purposes of studying and test taking. The key is a deliberate use of strategies that are not so elaborate that they are too difficult to remember in our short-term memory.
Consider this list of items. Look at the list for no more than 30 seconds. Then, cover up the list and use the spaces below to complete an activity.
| Baseball |
Picture frame |
Tissue |
Paper clip |
| Bread |
Pair of dice |
Fingernail polish |
Spoon |
| Marble |
Leaf |
Doll |
Scissors |
| Cup |
Jar of sand |
Deck of cards |
Ring |
| Blanket |
Ice |
Marker |
String |
Without looking at the list, write down as many items as you can remember.
Now, look back at your list and make sure that you give yourself credit for any that you got right. Any items that you misremembered, meaning they were not in the original list, you won’t count in your total. TOTAL ITEMS REMEMBERED _______________________.
There were 20 total items. Did you remember between 5 and 9 items? If you did, then you have a typical short-term memory and you just participated in an experiment, of sorts, to prove it.
Harvard psychology professor George A. Miller in 1956 claimed humans can recall about five to nine bits of information in our short-term memory at any given time. Other research has come after this claim, but this concept is a popular one. Miller’s article is entitled “The Magical Number Seven, Plus or Minus Two” and is easily accessible online if you’re interested in learning more about this seminar report.
Considering the vast amount of knowledge available to us, five to nine bits isn’t very much to work with. To combat this limitation, we clump information together, making connections to help us stretch our capacity to remember. Many factors play into how much we can remember and how we do it, including the subject matter, how familiar we are with the ideas, and how interested we are in the topic, but we certainly cannot remember absolutely everything, for a test or any other task we face. As such, we have to use effective strategies, like those we cover later in this chapter, to get the most out of our memories.
Now, let’s revisit the items above. Go back to them and see if you can organize them in a way that you would have about five groups of items. See below for an example of how to group them.
Row 1: Items found in a kitchen
Row 2: Items that a child would play with
Row 3: Items of nature
Row 4: Items in a desk drawer/school supplies
Row 5: Items found in a bedroom
| Cup |
Spoon |
Ice |
Bread |
|
| Baseball |
Marble |
Pair of dice |
Doll |
Deck of cards |
| Jar of sand |
Leaf |
|
|
|
| Marker |
String |
Scissors |
Paper clip |
|
| Ring |
Picture frame |
Fingernail polish |
Tissue |
Blanket |
Now that you have grouped items into categories, also known as chunking, you can work on remembering the categories and the items that fit into those categories, which will result in remembering more items. Check it out below by covering up the list of items again and writing down what you can remember.
Now, look back at your list and make sure that you give yourself credit for any that you got right. Any items that you misremembered, meaning they were not in the original list, you won’t count in your total. TOTAL ITEMS REMEMBERED _______________________. Did you increase how many items you could remember?
Long-Term Memory
Long-term memory is exactly what it sounds like. These are things you recall from the past, such as the smell of your elementary school cafeteria or how to pop a wheelie on a bicycle. Our brain keeps a vast array of information, images, and sensory experiences in long-term memory. Whatever it is we are trying to keep in our memories, whether a beautiful song or a list of chemistry vocabulary terms, must first come into our brains in short-term memory. If we want these fleeting ideas to transfer into long-term memory, we have to do some work, such as causing frequent exposure to the information over time (such as studying the terms every day for a period of time or the repetition you performed to memorize multiplication tables or spelling rules) and some relevant manipulation of the information.
According to Alison Preston of the University of Texas at Austin’s Center for Learning and Memory, “A short- term memory’s conversion to a long-term memory requires changes within the brain . . . and result[s] in changes to neurons (nerve cells) or sets of neurons. . . . For example, new synapses—the connections between neurons through which they exchange information—can form to allow for communication between new networks of neurons. Alternatively, existing synapses can be strengthened to allow for increased sensitivity in the communication between two neurons.”
When you work to convert your thoughts into memories, you are literally changing your mind. Much of this brain work begins in the part of the brain called the hippocampus. Preston continues, “Initially, the hippocampus works in concert with sensory-processing regions distributed in the neocortex (the outermost layer of the brain) to form the new memories. Within the neocortex, representations of the elements that constitute an event in our life are distributed across multiple brain regions according to their content. . . .When a memory is first formed, the hippocampus rapidly combines this distributed information into a single memory, thus acting as an index of representations in the sensory-processing regions. As time passes, cellular and molecular changes allow for the strengthening of direct connections among the neocortical regions, enabling access to the memory independent of the hippocampus.”
We learn the lyrics of a favorite song by singing and/or playing the song over and over. That alone may not be enough to get that song into the coveted long-term memory area of our brain, but if we have an emotional connection to the song, such as a painful breakup or a life-changing event that occurred while we were listening to the song, this may help. Think of ways to make your study session memorable and create connections with the information you need to study. That way, you have a better chance of keeping your study material in your memory so you can access it whenever you need it.
What are some ways you convert short-term memories into long-term memories?
Do your memorization strategies differ for specific courses (e.g., how you remember for math or history)?
Obstacles to Remembering
If remembering things for exams or for learning new disciplines were easy, no one would have problems with it, but students face several significant obstacles to remembering, including a persistent lack of sleep and an unrealistic reliance on cramming. Life is busy and stressful, so you have to keep practicing strategies to help you study and remember successfully, but you also must be mindful of obstacles to remembering.
Lack of Sleep
Sleep and college don’t always go well together. You have so much to do! All that reading, all those papers, all those extra hours in the science lab or tutoring center or library! And then we have the social and emotional aspects of going to school, which may not be the most critical aspect of your life as you pursue more education but are a significant part of who you are. When you consider everything you need to attend to in college, you probably won’t be surprised that sleep is often the first thing we give up as we search for more time to accomplish everything we’re trying to do. That seems reasonable—just wake up an hour earlier or stay up a little later. But you may want to reconsider picking away at your precious sleep time.
Sleep benefits all of your bodily functions, and your brain needs sleep time to dream and rest through the night. You probably can recall times when you had to do something without adequate sleep. We say things like “I just can’t wake up” and “I’m walking around half asleep.”
In fact, you may actually be doing just that. Lack of sleep impairs judgment, focus, and our overall mood. Do you know anyone who is always grumpy in the morning? A fascinating medical study from the University of California Los Angeles (UCLA) claims that sleep deprivation is as dangerous as being drunk, both in what it does to our bodies and in the harm we may cause to ourselves and others in driving and performing various daily tasks.
If you can’t focus well because you didn’t get enough sleep, then you likely won’t be able to remember whatever it is you need to recall for any sort of studying or test-taking situation. Most exams in a college setting go beyond simple memorization, but you still have a lot to remember for exams. For example, when Saanvi sits down to take an exam on introductory biology, she needs to recall all the subject-specific vocabulary she read in the textbook’s opening chapters, the general connections she made between biological studies and other scientific fields, and any biology details introduced in the unit for which she is taking the exam.
Trying to make these mental connections on too little sleep will take a large mental toll because Saanvi has to concentrate even harder than she would with adequate sleep. She isn’t merely tired; her brain is not refreshed and primed to conduct difficult tasks. Although not an exact comparison, think about when you overtax a computer by opening too many programs simultaneously. Sometimes the programs are sluggish or slow to respond, making it difficult to work efficiently; sometimes the computer shuts down completely and you have to reboot the entire system. Your body is a bit like that on too little sleep.
On the flip side, though, your brain on adequate sleep is amazing, and sleep can actually assist you in making connections, remembering difficult concepts, and studying for exams. The exact reasons for this is still a serious research project for scientists, but the results all point to a solid connection between sleep and cognitive performance.
If you’re interested in learning more about this research, the American Academy of Sleep Medicine (AASM) is a good place to start. One article is entitled “College Students: Getting Enough Sleep Is Vital to Academic Success.”
How long do you sleep every night on average? Do you see a change in your ability to function when you haven’t had enough sleep? What could you do to limit the number of nights with too little sleep?
Downside of Cramming
At least once in their college careers, most students will experience the well-known pastime called cramming. Consider the following scenario: Shelley has lots of classes, works part-time at a popular restaurant, and is just amazingly busy, so she puts off serious study sessions day after day. She isn’t worried because she has set aside time she would have spent sleeping to cram just before the exam. That’s the idea anyway. Originally, she planned to stay up a little late and study for four hours from 10 p.m. to 2 a.m. and still get several hours of refreshing sleep. But it’s Dolphin Week or Beat State Day or whatever else comes up, and her study session doesn’t start until midnight—she’ll pull an all-nighter (to be more precise, this is actually an all-really-early- morning-er, but it doesn’t quite have the same ring to it). So, two hours after her original start time, she tries to cram all the lessons, problems, and information from the last two weeks of lessons into this one session. Shelley falls asleep around 3 a.m. with her notes and books still on her bed. After her late night, she doesn’t sleep well and goes into the morning exam tired.
Shelley does okay but not great on the exam, and she is not pleased with her results. More and more research is showing that the stress Shelley has put on her body doing this, combined with the way our brains work, makes cramming a seriously poor choice for learning.
One sleep researcher, Dr. Susan Redline from Boston, says, “Sleep deficiency can affect mood and the ability to make memories and learn, but it also affects metabolism, appetite, blood pressure, levels of inflammation in the body and perhaps even the immune response.”
Your brain simply refuses to cooperate with cramming—it sounds like a good idea, but it doesn’t work.
Cramming causes stress, which can lead to paralyzing test anxiety; it erroneously supposes you can remember and understand something fully after only minimal exposure; and it overloads your brain, which, however amazing it is, can only focus on one concept at a time and a limited number of concepts all together for learning and retention.
Leading neuroscientist John Medina claims that the brain begins to wander at about 10 minutes, at which point you need a new stimulus to spark interest. That doesn’t mean you can’t focus for longer than 10 minutes; you just have to switch gears a lot to keep your brain engaged. Have you ever heard a speaker drone on about one concept for, say, 30 minutes without somehow changing pace to engage the listeners? It doesn’t take much to re-engage—pausing to ask the listeners questions or moving to a different location in the room will do it—but without these subtle attention markers, listeners start thinking of something else. The same thing happens to you if you try to cram all reading, problem-solving, and note reviewing into one long session; your brain will wander.
Determining When/What to Memorize
In the realm of learning and studying, some conditions warrant memorization as the most effective way to work with information. For instance, if you are expected to have a working knowledge of conversational French or Spanish, you will have to memorize some words. Simply knowing a long list of terms isn’t going to help you order food in a café or ask for directions in a foreign country because you also need to understand the other language’s grammar and have some sort of context for what needs to be said from your vocabulary list. But you cannot say the words in a different language if you cannot remember your vocabulary. From this scenario, you can assume that memorization is a good fit for some parts of language acquisition.
If you approach all your studying as memorization, you will find your course tests difficult at best. Most college courses will ask you to apply, analyze, evaluate, and create with the information you are learning, which is discussed earlier in the chapter. Merely being able to memorize so that you can recognize or recall information will not get you far in your college classes.
A worthwhile book on memory, thinking, and learning is a short study called Make It Stick: The Science of Successful Learning by Peter Brown, Henry Roediger, and Mark McDaniel. The authors conclude, after extensive research, that our attempts to speed up learning and make studying easier are not good ideas. Studying is hard work, and it should be. For learning to stick, we need to work hard to pull the information out of our memory and use it by continually pushing ourselves to accomplish increasingly difficult tasks.
Licenses and Attributions:
Original content: CC BY Attribution:
OpenStax College Success Concise Chapter 4.2. Access for free at: https://openstax.org/books/college-success-concise/pages/4-2-memory
Baldwin, A. (2023). Memory. In College Success Concise. OpenStax.
Modifications: Figures and activities renumbered.
Footnotes:
NCBI. “What are the differences between long-term, short-term, and working memory?” https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2657600/
Sumrall, William, et. al. “A Review of Memory Theory.” International Journal of Humanities and Social Science, 2016. Vol. 6. No. 5.
Miller, George A. “The Magical Number Seven, Plus or Minus Two: Some Limits on Our capacity for Processing Information.” Psychological Review, 1956.
Preston, Alison. “Ask the Experts: How do short-term memories become long-term memories?” Scientific American, Dec. 2017. https://www.scientificamerican.com/article/how-do-short-term-memories-become-l/
Nir, Yuval, et. al. “Selective neuronal lapses precede human cognitive lapses following sleep deprivation,” Nature Medicine volume23, pages 1474–1480 (2017).
UCLA Health. “Drowsy Driving.” https://www.uclahealth.org/sleepcenter/drowsy-driving
Redline, Susan https://abcnews.go.com/Health/Sleep/health-hazards-linked-lack-sleep/story?id=16524313