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Exploring the Cerebellum: The Brain’s Master Coordinator

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Exploring the Cerebellum: The Brain’s Master Coordinator

Introduction to the Cerebellum

The cerebellum, intriguingly known as the “little brain,” is a fascinating and integral part of our nervous system. This designation stems from its Latin origin, which literally translates to a smaller counterpart of the brain. Despite its modest size, especially when compared to the larger cerebral hemispheres, the cerebellum plays an outsized role in maintaining our body’s motor functions.

Located under the occipital lobes of the cerebrum and behind the brainstem, the cerebellum forms the largest part of the hindbrain. Its development is an elegant process originating from the alar plates of the metencephalon, a region in the developing brain of an embryo. This early formation is crucial for its complex and vital roles in the mature human brain.

The cerebellum’s primary responsibilities are manifold and essential for everyday function:

  1. Maintenance of posture and balance: It is the cornerstone of our ability to stand upright, walk, or perform any balancing act. The cerebellum continuously processes input from various body parts to adjust and maintain our posture and balance.
  2. Maintenance of muscle tone: It plays a critical role in regulating the tension and strength of muscles, ensuring they are neither too lax nor overly tense. This regulation is key to our body’s smooth and coordinated movement.
  3. Coordination of voluntary motor activity: Perhaps its most renowned function, the cerebellum fine-tunes our voluntary movements. It ensures that our movements are precise, smooth, and coordinated, allowing us to perform tasks gracefully and efficiently.

The cerebellum’s ability to perform these functions seamlessly and without conscious effort on our part underscores its complexity and importance in our daily lives. Its precise regulation of movement and posture is fundamental to our interaction with the physical world.

Cerebellar Lesions

Lesions in the cerebellum can cause symptoms on the same side of the body. These may include an unsteady gait, tremor, nystagmus (rapid involuntary eye movement), and dysarthria (difficulty articulating words).

External Features of the Cerebellum

The cerebellum’s structure mirrors that of the cerebral hemisphere, with a thin layer of cortex on the outside and deeper white matter within. Its grey matter is intricately folded, forming a pattern known as the “arbor vitae” or tree of life, a design that allows millions of neurons to occupy a compact area. Located in the posterior cranial fossa, the cerebellum is positioned behind the fourth ventricle, the pons, and the medulla oblongata and is covered by the tentorium cerebelli. It’s ovoid in shape, constricted in the middle, and consists of two hemispheres united by a narrow median vermis.

Phylogenetic and Functional Divisions

The cerebellum is divided into three main lobes:

  • Anterior Lobe (Spinocerebellum): Located on the superior surface, this lobe receives sensory input and regulates muscle tone.
  • Middle or Posterior Lobe (Neocerebellum): The largest part, situated between the primary and posterolateral fissures, and is responsible for coordinating voluntary motor activities.
  • Flocculonodular Lobe (Vestibulocerebellum): The smallest lobe, responsible for maintaining posture and balance.

Horizontal Fissure

This deep fissure along the cerebellum’s margin separates the superior and inferior surfaces. Though morphologically and functionally insignificant, it is a notable structural feature.

Longitudinal Organisation

The cerebellum has three functional longitudinal zones:

  • Median (Vermal) Zone: Projects to the fastigial nucleus.
  • Paramedian (Paravermal) Zone: Projects to the interposed nuclei.
  • Lateral Zone: Projects to the dentate nucleus.

Mnemonic for Cerebellar Parts

A handy mnemonic to remember the parts of the cerebellum from anterior to posterior is: “Like Cats Catching Dogs For The Party Up North.” This represents the Lingula, Central Lobule, Culmen, Declive, Folium, Tuber, Pyramid, Uvula, and Nodule.

Expand Your Knowledge with a Free Online Course on Cerebellum Anatomy

To further enhance your understanding of the cerebellum, consider enrolling in our free online course, The Anatomy of the Cerebellum. This comprehensive course offers an in-depth exploration of the cerebellum’s structure, segments, and regions. It delves into the cerebellum’s role in developing motor skills, maintaining balance and posture, and the intricate functioning of neurons within our brain. 

Suitable for anyone curious about the central nervous system or seeking to advance their knowledge in neuroanatomy, this course is an invaluable resource for both personal and professional growth. Enrol now to deepen your understanding of this vital brain component.

Free Online Course on Cerebellum Anatomy

How Do You Feel About Holiday Music?

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How Do You Feel About Holiday Music?

Which activities do you look forward to during the holiday season? Putting up decorations? Watching movies? Building gingerbread houses?

What about listening to Christmas music? Are you the type of person who can’t wait to turn on your holiday playlist each year? Or would you be happy if you never heard a Christmas song again?

In “Why You Love (or Love to Hate) Christmas Music,” Derrick Bryson Taylor writes about why the genre can inspire such strong reactions in us:

It’s been a little over one year since the Backstreet Boys released their Christmas album, “A Very Backstreet Christmas,” and Francine Biondo has had it on repeat ever since.

To be fair, Ms. Biondo, 39, a child care provider in Ontario, Canada, is a fan of Nick Carter and maybe even a bigger fan of Christmas music. The Christmas season was in full swing for her by mid-November, with plans to decorate a tree. Although she typically begins listening to holiday music after Halloween, she is known to sprinkle in a little Christmas cheer during the summer.

“It just puts me in a happy, feel-good mood,” she said by phone of songs like Mariah Carey’s “All I Want for Christmas Is You,” adding that they invoked happy memories of her childhood.

For Ms. Biondo, the songs do more than get her into the holiday spirit, they also boost her productivity. “To be honest, I need music to just get me through the day,” she said. “I need music when I’m cleaning the house and just doing the daily things, it kind of helps motivate me. Christmas music, especially around that time of year, it just more fun.”

She might be on to something.

Daniel Levitin, an author and musician in Los Angeles and a professor emeritus of psychology and neuroscience at McGill University in Montreal, said research has shown that most people in Western countries use music to self-soothe. “They know that there are certain kinds of music that will put them in a good mood,” he said. “Christmas music is a reliable one for a lot of people.”

But, Mr. Taylor writes, Christmas music doesn’t evoke good feelings in everyone:

Conversely, if negative memories and feelings are associated with Christmas, the same songs could cause the brain to release cortisol, the stress hormone that increases the heart rate, and trigger the amygdala, the brain’s fear center. “There are a lot of people who, when Christmas time comes around, they just want to run home and put their head under the covers and wait it all out,” Mr. Levitin said.

Christmas music, like all forms of music, is powerful. But this genre is perhaps more potent than other forms of music because the holiday season itself is emotionally charged. It represents the ideals that most humans strive for like equality, tolerance, love and tranquillity. “For some of us, that’s an inspiring message,” Mr. Levitin said. “For others of us, it just draws in stark relief how far we are from achieving that.”

Students, read the entire article and then tell us:

  • How do you feel about Christmas music? When you hear “Jingle Bells,” “Silent Night” and other seasonal songs, do you feel warmth and happiness? Dread and frustration? Or something else?

  • Do you have a favorite — or least favorite — holiday song? Why?

  • One person interviewed for this story said that the song “O Little Town of Bethlehem” always makes her think of her grandmother. Do you have positive — or negative — memories associated with certain holiday songs? If so, tell us about one.

  • If you don’t celebrate Christmas, do any other holidays you celebrate have music associated with them? What feelings and memories do those songs bring up for you?

  • Ms. Biondo, a lover of Christmas music said, “To be honest, I need music to just get me through the day.” Do you feel that way about music? Why do you think that it can evoke such strong emotions in us?


Students 13 and older in the United States and Britain, and 16 and older elsewhere, are invited to comment. All comments are moderated by the Learning Network staff, but please keep in mind that once your comment is accepted, it will be made public and may appear in print.

Find more Student Opinion questions here. Teachers, check out this guide to learn how you can incorporate these prompts into your classroom.

Snowfall

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Snowfall

Use your imagination to write the opening of a short story or poem inspired by this photo or, describe a memory from your own life that this image makes you think of.

Tell us in the comments, then read the related article to learn more.


Students 13 and older in the United States and Britain, and 16 and older elsewhere, are invited to comment. All comments are moderated by the Learning Network staff, but please keep in mind that once your comment is accepted, it will be made public and may appear in print.

Find more Picture Prompts here.

Word of the Day: dyspeptic

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Word of the Day: dyspeptic

The word dyspeptic has appeared in 15 articles on NYTimes.com in the past year, including on Oct. 19 in “‘Killers of the Flower Moon’ Review: An Unsettling Masterpiece” by Manohla Dargis:

Ernest and Mollie’s courtship develops with graceful naturalism — the two actors make immediate sense together — and their relationship grounds the story emotionally. Now 48, DiCaprio is about twice as old as the real Ernest was at the time, and age has made his face more yielding and eloquent. Ernest looks like he’s been beaten up by life (the war presumably took a toll, too), and when you first see him, a large frown is tugging his face downward, giving him a sour, dyspeptic look that only really lifts when his and Mollie’s romance takes flight. Sometime later, you realize that his uncle has the exact same frown, although Hale, who presents himself as a welcoming man of the people, is careful about who sees his displeasure.

Can you correctly use the word dyspeptic in a sentence?

Based on the definition and example provided, write a sentence using today’s Word of the Day and share it as a comment on this article. It is most important that your sentence makes sense and demonstrates that you understand the word’s definition, but we also encourage you to be creative and have fun.

If you want a better idea of how dyspeptic can be used in a sentence, read these usage examples on Vocabulary.com. You can also visit this guide to learn how to use IPA symbols to show how different words are pronounced.

If you enjoy this daily challenge, try our vocabulary quizzes.


Students ages 13 and older in the United States and the United Kingdom, and 16 and older elsewhere, can comment. All comments are moderated by the Learning Network staff.

The Word of the Day is provided by Vocabulary.com. Learn more and see usage examples across a range of subjects in the Vocabulary.com Dictionary. See every Word of the Day in this column.

Gen AI and Your Workforce

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Gen AI and Your Workforce
  • Prompt leaking is getting worse – This happens with any LLM I should add, but researchers focus on ChatGPT (since it is very popular). The version they eye is 3.5 (ChatGPT), 4 (the paid version, and better than 3.5), Enterprise ChatGPT (the business version, which is mainly like 3.5 Turbo – which vendors in our space tend to go to) and that’s it. 4.5 Turbo available only to developers at this time, is also starting to show issues with something else. The idea that no employee at your company will try to jailbreak ChatGPT, may be foolish on your side. The way to counter it, for all those CLOs out there – is to come up with a gameplan. Ditto for the company themselves – hello Compliance Officer and CTO. L&D will end up getting involved – those who oversee it at companies, who do not have the title of CLO (depends on company, organization, etc.) Ditto again, if you are running training for an internal workforce.

Some zingers that have come as a result of prompt leaking include:

  • Getting the directions on how to make illicit items such as napalm (using the grandmother hack)
  • Getting personal information, including addresses, phone numbers and other personal data on a random individual (not working at your company) This was achieved multiple times. One way, was the repeating of the word poem, over and over again.
  • Getting private company information including the company’s financials. This was the company’s own information, and not from a public generative AI. Rather an enterprise version

Prompt Leaking doesn’t take a Ph.D. to jailbreak, and that is a problem. Anyone can jailbreak, by chance. Granted the ones you hear often are do to researchers testing it or testing samples. Just recently, a publication called Decrypt was able to prompt leak (jailbreak), of Grok, the LLM from Elon Musk which is available only to paid subscribers of X (formally known as Twitter).

While OpenAI will make the fix, the challenge is that this isn’t going to be one-off. There will be more.

For those thinking, no worry I will use another LLM and it won’t happen to me, recognize that any LLM can present prompt leaking. Even with your own data and information; and not public – i.e. the internet.

  • Lazy Results – A brand new to start appearing. In November, people started complaining on Reddit that they got far fewer results when using ChatGPT. Many folks scoffed. Well, surprise! It is happening with ChatGPT-4 (the paid version). The AI responds with less characters (words) or says something along the lines that it can’t respond (even though the question is something it could respond to)
  • AI Bias – It is real, it happens when you shove in your own materials, your own reports, data, etc. into an LLM. This is a problem with generative AI. I don’t care if you are using an Enterprise version of an LLM, AI bias can occur
  • Hallucinations – One vendor in our space, identifies it as a mistake (when folks are starting to use the generative AI. A mistake is when I am not paying attention to my cell phone, and the President of my country calls me. Hallucinations produce fake and false information. And it doesn’t matter if its your own materials, information or not. I think way too many companies, believe it is their own stuff going into the LLM, then this won’t happen. Sorry, it will.
  • I cannot stress this enough: there is no such thing as 100% accuracy. Even vendors who say well it is 98% accurate, can’t guarantee this to take place with your stuff. It might end up 95%, 92%, who knows. The point here is if you are fine with, let’s say 3% inaccuracy and it is happening with your employees using it for their work, and that work happens to be crucial to the company, that will be okay with you? Especially if the employee has no idea that it is wrong? I don’t think so.

The Latest LLMs that vendors are using, and perhaps your company is too

  1. Create a course covering the basics around generative AI, specifically about hallucinations, which exist in any LLM (you can ignore that part), so you can just say ChatGPT (or whatever solution you are using). This means fake or false information – and state as that.
  2. Say that before you place it into a task, or just learn new information (or whatever vernacular you decide on – based on your audience), – the learner needs to review it before sending it off (let’s say the person is creating a deck, and it is a cut and paste thing OR taking that info and applying it to some task they need to do). Correct the information. If they are unsure, ask someone at the company to validate – let them know this is a positive thing to do (I think a lot of people won’t, but if you are using or having mentors, this is a plus for them)
  • Do not start with an ambiguous question. The results will be all over the place – plus your company is paying for that LLM, and token fees will escalate when folks are entering in statements or phrases in the prompt. If you are a company with 5,000 or 100,000, those numbers skyrocket, and your company will take a financial hit – especially at the 50,000 or more. This again, is more along them using ChatGPT (for example) for work – and a lot are. This is another screen recording, plus some text. Or just screen recording. I mean you might have a course title and then have specific modules for them. Ensure your vendor provides analytics based on how often the person went to that specific module and how long.
  • You can create a list with bullet points on anything specifically, for example:

Newsletter on Generative AI

  • They do not know all the regulations that countries or the EU have implemented for AI. They are not all the same,; they must ensure their system is compliant. California has its regulations in the states – similar to the EU, but not exactly; New York has their own, and other states are going that way (clearly not all). India has their own, the US has started (but I am not expecting EU level), China has its own, Australia has its own, and other countries I did not mention may have their own. Only one vendor I am aware of has a 3rd party company keeping track of all the regs and passing it through to the vendor. These regulations will continue to change; a vendor must know this and understand and implement it. And it will take more than one person, IMO to deal with this.
  • Some of the responses around not listing information in their system about hallucinations that might occur are frightening to me. I have seen this with a few vendors. Holy Moly. And their reasons for doing it, are concerning. Again, not just one vendor, multiple vendors. This isn’t a game. This is a must. If you are creating a course (which is popular with vendors for generative ai) you need to let folks know this. Ditto, say AI bias. I have seen only two vendors really stipulate this, with one, on everything that generative ai does in their system – which is the way to go. The other vendor, which has generative ai on the learner side, mentions it, but in small text.
  • None of them have context windows (the prompt window you see) that, thru icons or whatever, allows the admin or whomever to identify that if the information is incorrect, what is the correct response and submit it. Despite them seeing this in any LLM out there, such as ChatGPT-4. The AI learns from itself, so if you edit the response, which even the vendor does, and save it, the generative AI doesn’t know this. Thus wrong response, the AI says, okay, it must be right.
  • Pricing for those tokens, the cost to you, is really low right now – because first the cost per character is low – but the systems that have gen ai, only a few have it on the learner side, so yeah, it should be low cost to the client. A couple are rolling it out on the learner side next quarter. What I have seen are three pricing angles:

E-Learning 24/7

Winter Fun, Holiday Drama and Giving Back: Seasonal Writing By Teens

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Winter Fun, Holiday Drama and Giving Back: Seasonal Writing By Teens

Before winter arrives, I visualize myself eating all the mouthwatering food that comes along with the winter holidays and traditions. Various foods such as tamales, pozole, and mole are eaten on special occasions like Christmas. While my sister disregards that these amazing dishes are eaten once or twice a year, I make the most out of these days.

Yahir, Hyattsville, MD

One thing I appreciate about winter is that it gives my extended family time to come together. Over the last few years, seeing my relatives has gotten harder and harder, due to Covid, and some of my family moving farther away … No longer can my family simply drive down the coast to see them for a few days, or vice versa. Instead, we need plane tickets, and usually a full week to properly see each other now. Winter gives our family just enough time to see my uncle and aunt, because of the long winter break at the end of December.

William, East Lyme

I think mountaineering in the winter is spectacular … I prefer snowshoeing, a slower approach that allows me to soak in my snow-covered surroundings. The crisp, cold air gently blows against my exposed face, and I can feel the sky above on the edge of more snowfall. I trek up the slopes, snaking along frozen streams and across picturesque wooden bridges, the snowbanks carrying me over the most rugged roots and rocks below. It’s just me and the ethereal reflections of the sun on distant white peaks. It can be hard to get a sense of the natural beauty in the summer when the tree’s leaves and summer haze obscure the views, and peak-season activity jeopardizes this cherished solitude. Moreover, unlike my other hiking experiences, there isn’t a mosquito in sight and I’m not soaking in sweat.

Nathan, East Lyme Highschool

Quiet. Quiet is undoubtedly the aspect of winter that I appreciate most, and is a large part of why this frigid season is my favorite. If you haven’t noticed, our lives are filled with constant noise. And I’m not just talking metaphorical noise, but rather our lives are literally filled with very noisy things. The average person will typically wake up to the racket of cars, lawnmowers, airplanes, leaf blowers, and all sorts of other frankly exhausting sources of unending noise. But winter is different. When the snow falls, everything goes quiet. Not only does the snow physically absorb sound waves, but it also prevents people from doing things like yard work. Driving is less safe when it snows, so people opt not to go anywhere. For a moment, the world is still. My brother and I can walk outside to play with the dog, and silence will greet us at the door. In a world where finding quiet is becoming increasingly more difficult, it is imperative that we take the time to appreciate such moments of peace.

Bennett, Glenbard West High School, Glen Ellyn IL

See you in 2024!

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See you in 2024!

Happy winter holidays! We’re taking a break to spend time with our families (and to get going on the work for the spring semester, who are we kidding). We’ll return on Jan 11, 2024 with a podcast episode.

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Carolina Family.jpg

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Parent and Child

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Parent and Child

What do you think this image is saying? How does it relate to or comment on society or current events? Can you relate to it personally? What is your opinion of its message?

Tell us in the comments, then read the related Opinion essay to learn more.


Students 13 and older in the United States and Britain, and 16 and older elsewhere, are invited to comment. All comments are moderated by the Learning Network staff, but please keep in mind that once your comment is accepted, it will be made public and may appear in print.

Find more Picture Prompts here.

Word of the Day: plutocrat

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Word of the Day: plutocrat

The word plutocrat has appeared in three articles on NYTimes.com in the past year, including on April 11 in the Opinion essay “Inequality Ahoy! On the Meaning of the Superyacht” by Paul Krugman:

When rich people can afford to buy and operate big yachts, they do. Indeed, yachts are a highly visible indicator of inequality, the concentration of income and wealth in the hands of the few. The Gilded Age was marked by a proliferation of ever bigger, ever more elaborately furnished yachts; when J.P. Morgan built a large steam yacht, its 1898 launch was featured in The New York Times.

… Owning and operating a really big yacht is, however, as clear an example as you’re likely to find of Thorstein Veblen’s theory of conspicuous consumption — spending intended to demonstrate one’s wealth and status, rather than for the direct satisfaction it yields. Indeed, the New Yorker article suggests that demand for superyachts really took off once owning your own plane stopped being an effective status symbol: “Once it seemed that every plutocrat had a plane, the thrill was gone.”

Can you correctly use the word plutocrat in a sentence?

Based on the definition and example provided, write a sentence using today’s Word of the Day and share it as a comment on this article. It is most important that your sentence makes sense and demonstrates that you understand the word’s definition, but we also encourage you to be creative and have fun.

If you want a better idea of how plutocrat can be used in a sentence, read these usage examples on Vocabulary.com. You can also visit this guide to learn how to use IPA symbols to show how different words are pronounced.

If you enjoy this daily challenge, try our vocabulary quizzes.


Students ages 13 and older in the United States and the United Kingdom, and 16 and older elsewhere, can comment. All comments are moderated by the Learning Network staff.

The Word of the Day is provided by Vocabulary.com. Learn more and see usage examples across a range of subjects in the Vocabulary.com Dictionary. See every Word of the Day in this column.

This Is the Most Popular Day & Time to Learn to Code

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This Is the Most Popular Day & Time to Learn to Code

We all have quirks when it comes to our daily routines. For example, you might be a morning workout person or swear by a nighttime shower. Or maybe your dog nudges you for a walk at 11am like clockwork. Or perhaps you can’t make it through the 3pm slump without getting yourself a little treat.

You probably have a favorite time of day to take coding courses or work on your latest programming project, too. Consistency is key when you’re learning to code, so it’s wise to find a schedule and routine that’s manageable for you. The cool thing about our courses and paths is that they’re self-guided, so you can work on them whenever you want, for however long as you want.

As part of Code Review, our look back on data from 2023, we wanted to know: What time of day do most of our learners like to work on courses? Read on to learn what the most popular time of day to learn to code is and the days of the week when learners are most productive.

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Prime times for programming

According to our data, the most popular time for Codecademy learners to code is from 10am to 4pm, with 2pm coming in as the most active hour of the day. (We have learners around the globe, so we adjusted our data points to learners’ local time zones where possible.)

There might be a scientific reason why learners tend to log on during this period: Research on sleep and productivity suggests that your brain is ready to acquire new information between 10am and 2pm, and then again between 4pm and 10pm. As for the 2pm peak, it’s possible that lots of our learners are squeezing in a lunch break coding session when they feel refocused and refueled.   

While the majority of learners prefer to code during daylight hours, a slice of learners in our community are practically nocturnal. We found that 7% of Codecademy’s learners are most active between 12am and 6am. These night owls have found a way to harness the quiet solitude of the early morning hours or the late-night stillness to work towards their coding goals.

We’re all wired differently and have unique preferences for when we sleep and when we study. No matter when you log on to learn to code, take comfort in the fact that there’s probably someone else tuning in at the same time somewhere in the world.

Most active days of the week

When we unpacked the days of the week when learners in our community tend to be the most active, Tuesday came out on top. Perhaps it’s the sense of a fresh start after Monday or the anticipation of the week’s challenges ahead that fuels the Tuesday surge in activity. If Tuesday is your most productive day of the week, see if you can tap into that energy and use that day to tackle more complicated coding challenges.

On the flip side, we found that learners are the least active on Saturdays. If you’re not a weekend warrior, you can use Saturdays as an opportunity to reflect, listen to a tech-y podcast, or do something completely unrelated to coding. Understanding and adapting to the weekly ebb and flow can make your learning experience more intentional and enjoyable in the long run.

Make coding part of your daily routine

There’s truly no one schedule or routine that works for everyone, and the best time to code is whenever your mind feels sharp, and your enthusiasm is at its peak. Whether you burn the midnight oil or code during the day while your kids are at school, you have the flexibility to create your own plan — and change it if you need to.

Try coding during different times of the day until you zone in on your optimal learning period, then work to establish a realistic routine. If you need some inspiration, read this blog about the creative ways that real people in our community made time to learn to code. Remember: Everyone is unique, and what works for one person may not work for another.

We had a lot of fun unveiling the diverse habits of our community of learners, and we hope these insights help you feel motivated and inspired. Maybe it’s time to ramp up your weekly learning target, or set some ambitious goals for 2024 and beyond? Be sure to check out the rest of Code Review 2023 on the blog and social media to discover the Codecademy data points that defined this year.