The Left Brain Speaks, the Right Brain Laughs

Ransom Stephens

• Publisher: Viva Editions
• Year: 2016
• eBook ISBN: 9781632280473
• Topic: Psychology
• Subtopic: Cognitive Neuroscience & Neuropsychology
• Index: Psychology

In The Left Brain Speaks, but the Right Brain Laughs, physicist Ransom Stephens explains the interesting and often amusing tale of how the human brain works. Using understandable metaphors and easy to follow language, Stephens gives readers of any scientific level an introduction to neuroscience and shows them how things like creativity, skill, and even perception of self can grow and change by utilizing the body's most important muscle. Fans of Bill Nye and Neil deGrasse Tyson will love Stephens' down to earth attitude and those interested in science will appreciate his thoughtful explanations of scientific terms. The Left Brain Speaks, but the Right Brain Laughs is the perfect gift for anyone who wants to know what's going on inside their head and how they can use that knowledge to make themselves the best humans they can be.

1

YOU & ME

IT STARTS WITH ON/OFF.

As Starla wakes up, the light seeping through her closed eyelids tells her that the room is no longer dark.

Before we can understand anything about visual awareness, we have to understand the difference between light and dark. Let’s call our humble detector of day or night, shadow or illumination, “first-order vision.” By growing higher orders of visual consciousness from this simple starting point, we trace the complex from the simple.

Besides, we have to start somewhere; it might as well be morning.

Now, with the alarm clock playing a wakeful tune like “Enter Sandman,” Starla opens her eyes, stretches, and drags her sleepy ass out of the sack.

She hears rain tapping on the window and puzzles over how such bright light can leak around the curtain on a rainy day.

Pulling aside the curtain, she beholds the magic of coexisting rain and sunshine. A heavy, gray cloud lumbers past. The late morning sun shines from behind her, working its rays under the cloud and lighting the hills across the valley from her window. At first, the colors look wispy, but then she sees a rainbow arcing over the horizon and, having seen it, she can’t unsee it: red at the top followed by orange, yellow, green, blue, indigo, and violet at the bottom.

Perhaps the mnemonic device Roy G. Biv comes to mind; or maybe she muses on the magic and wonders if it’s a metaphor come to life: Is she somewhere over the rainbow? Maybe she pictures light entering the spherical raindrops, bending into the component colors as in a prism or on a Pink Floyd album cover, and then reflecting off the other side of the raindrops back to her eyes, or maybe she jumps into her clothes and heads out in search of the pot of gold at the end of that rainbow.

We’ll see how the story ends, but we know that it begins with a dichotomy: light and dark, a dichotomy that expands into a spectrum of colors when she pulls the curtain open. So it is with the left-brain/right-brain dichotomy. And so it is with every scientific endeavor. We don’t start with the simplest situation because it’s a good idea; we start at this first-order, on/off level of understanding because we’re dumb apes who don’t have a hope of understanding something complicated if we don’t start with something easy. Okay, I’m a dumb ape; you’re a glorious human.

Let’s back up and take a closer look at Starla’s experience. Her first-order visualization was light and dark. Then, with her light detectors wide open, her second-order visualization brought a spectrum of colors; a spectrum that can be divvied into an infinite number of colors between red and violet or, for that matter, between red and orange.

If she’s into it, maybe she starts assigning the colors names like atomic tangerine and razzle-dazzle rose, dividing the colors into categories, subcategories, and sub-subcategories. This sounds boring to me, sort of like stamp collecting. A lot of science is like stamp collecting, but that’s not the kind of science we’re doing in this book.

After zoning out on the rainbow, Starla goes into the kitchen to fire up the coffeemaker. Still thinking about the infinite variations of color within the rainbow, she notices the Metallica black-light poster over the microwave. Rather than question the ridiculousness of her roommate’s interior-decorating choice—having just woken up, after all—she fixates on the artificially bright fluorescent colors of the fire-breathing, dragon-demon, heavy-metal poster; mostly gonzo green and electric lava. She realizes that these colors are not among the infinite number of colors in the rainbow.

“What the hell?” she thinks to herself.

Scooping coffee into a filter, she recalls that human eyes detect only three colors, and that every color we see is a combination of red, green, and blue—she thinks the three colors might have fancier names, maybe like the overpriced ink cartridges in the printer that came “free” with her laptop: magenta, yellow, and cyan. The thought causes her to pour an extra scoop into the filter.

She figures that those black-light colors must be a combination of the three fundamental colors or she wouldn’t be able to see them. And since the colors in a rainbow come from separating the yellowish-white light of the sun into its spectrum, black-light colors must be some sort of combination of red, green, and blue, but in a way that emphasizes the separate components differently than sunlight does in rainbows.

She hits the power button and hopes the coffee starts dripping soon. It occurs to her that too much thought in the morning could be lethal, a thought that brings to mind the color of coffee. She dubs it heavy-metal patina, which gives her a giggle.

As our heroine fixes her morning java, let’s note that she has worked her way to a third-order understanding of color. Three layers of complexity: light-dark, the rainbow spectrum, and now fluorescent black-light colors.

Finally sipping her coffee, Starla wonders how her roommate convinced her that a Metallica poster was appropriate kitchen art.

With sufficient caffeine rushing through her veins, Starla accelerates into action, transforming from a color-contemplator into a business professional with meetings to attend in faraway lands. When she’s packed tight into a coach window seat staring at the same raincloud, and presumably the same rainbow, she wonders why they’re called bows. Shouldn’t they be called ribbons? From up here, the rainbow doesn’t touch the ground. It’s not even an arc; it’s a closed circle. Pondering the time wasted by leprechauns searching for pots of gold, she realizes two things: First, the reason why Ireland can never seem to maintain economic prosperity, and second, that there’s another rainbow. The secondary rainbow is far dimmer than the primary, and the colors are reversed, with violet on top and red at the bottom. Starla has made a fourth-order discovery.

1.1 PEELING THE IGNORANCE ONION

I opened our book with Starla’s rainbow experience because it shows how science progresses. We peel the onion of ignorance one layer at a time.

Just as there is a lot more to light than bright and dark, there’s a lot more to how brains work than left and right, but that’s where we’re going to start. Then, building on that somewhat false dichotomy, we’ll toy with others.

Yes, it’s all a ruse.

In this book, you and I will investigate how innovation leads to discoveries, how art and science are totally different (yet also damn near the same), why we’re never really alone even though we can’t seem to get together, how analysis and intuition can’t live without each other, why talent can’t be distinguished from skill or vice versa, how life is built from death, and why the death of a friend feels so incomprehensible.

You will notice that each chapter heading combines two concepts that we often think of as separate but turn out to be deeply interrelated. Yes, even life and death; before you throw a yellow flag (or hold up a yellow card) on the seemingly obvious absurdity of that last statement, wait until you see what I mean. Then throw the flag, mark off the fifteen yards (or take a penalty kick), and we can talk.

By the way, I’m going to convert all measurements from American vernacular to metric, including football references.

With the preamble out of the way, let’s get rolling.

Consider that instant of puzzlement when Starla heard rain tapping on the window and wondered how it could be so bright on a rainy day. Without that quandary, she’d never have boarded the train of thought that led to her analysis of rainbows and her discovery of how color works. That surprise, that instant when awareness of something out of the ordinary boiled up from her senses to her conscious mind, was the key to her whole discovery process. Had it never happened, Starla would probably still have the Metallica poster in her kitchen.

1.2 LEFT & RIGHT

Before the dawn of modern neuroscience, back when the first tentative insights came from people like Freud and Jung as they tried to reverse-engineer the brain, studies of anatomy demonstrated that, along with arms, legs, eyes, ears, nostrils, hands, and feet, people had what appeared to be two copies of their brains: a left hemisphere and a right hemisphere. The first-order insight—the dark-light level of understanding—was that the left brain controls the right side of the body and the right brain controls the left side. Like the vast majority of information on how the brain works, this insight came from doctors observing patients with injured brains.

Take Graham for instance. We travel to a South African bar during the Boer War, a mere 110 years ago. Seated a few stools down, Graham, a surly English officer, refers to a conscripted Scot as a cheap drunk. The Scot objects to being called cheap and rises in anticipation of a jolly brawl. Graham reaches for a sidearm. Disappointed that there won’t be a tussle, the Scot pulls out his pistol too. The two men stare at each other. At this point, you and I get the hell out of the bar. We hear a gunshot from inside followed by silence. Peeking through the door, we see that the bullet has destroyed the left side of Graham’s brain. We rush in and recommend that pressure be applied to the wound. Recognizing the uncharitable nature of his actions, the Scot stops the bleeding and, after months of care, Graham’s injury heals.

With no left brain hemisphere, Graham can’t see through his right eye or hear in his right ear; he has no control over his right arm or leg, though he can smell through his right nostril but not his left. With half a mind to work with, Graham provides first-order evidence that the two sides of the brain control opposite sides of the body. The gap in that observation, that nostrils don’t share the asymmetry of the other senses and motor functions, indicates higher-order subtleties still to be understood. Among the less subtle distinctions was that Graham also couldn’t speak or understand language.

While the left and right brains look quite similar, they assume distinct roles in sensory and language processing. The obvious generalization is that the left and right lobes play different roles and perform separate tasks. The legend of your left brain as the inner accountant and your right brain as the inner artist emerged in 1960 and turned out to be a gross oversimplification.

Don’t be too harsh on the neurologists of the day. They didn’t propagate the left-right myth; the press did. And don’t be too harsh on them either. Two ingredients go into misinformation: First, people overreact, it’s one certain assumption you can make about human behavior; and second, science progresses through incremental discoveries one layer of the ignorance onion at a time.

The right brain does play a big role in creativity, but so does the left brain. The left brain breaks things down into little, understandable pieces, but the right brain makes sure that those pieces still fit a greater whole.

The title of our book—I wrote it and you bought it, so we both own it—The Left Brain Speaks, the Right Brain Laughs—is a glaring example of a mythic oversimplification. In nineteen out of twenty right-handed and four out of five left-handed people, the left brain does the speech-production-and-recognition heavy lifting, and, without the right brain, your sense of humor is all but lobotomized. However, your left brain produces the actual hahahas of laughter. So our title serves as an example of mostly-but-not-completely false dichotomies. Just between the two of us, if you prefer, we can call it The Left Brain Tells the Joke, the Right Brain Gets It, and Then the Left Brain Laughs.

1.2.1 A new and improved left-right oversimplification

To update the roles of your left and right hemispheres, we begin with a guiding principle and then assemble a bunch of nuances. In the pages that follow, the roles will fit a larger pattern and make more sense.

Through the miracle of fiction, please don a pith helmet, and the two of us can hike into the savannah of one hundred thousand years ago. We come upon a young man named Butch as he emerges from the cave he shares with his community of ten to thirty cave people— he doesn’t know how many because he can’t count past three.

With his torn lion-skin loincloth and a plethora of scars across his torso, Butch emits quite an aggressive vibe, so we hide behind some reeds. You point out a bloat of hippos in the pond. I start to laugh at the word bloat, and you remind me that hippos are huge, gnarly critters and I shut up.

Butch notices the hippos too and ducks behind a boulder. He looks down and finds a nice rock. He watches the hippos for several minutes and then stands, steadies his right foot, goes into a windup, and lets the rock fly. Wham! Right into the hippo’s eye and through its brain. We look at each other and agree that the kid’s got a hell of an arm. If he was left-handed and, you know, born one hundred thousand years later, he could have gone pro.

Now let’s look at it in slow motion.

Butch spots the herd. His left brain examines individual hippos, looking for one that appears sedentary enough so that it’s not likely to move, is meaty enough to feed the whole tribe, is standing in water shallow enough for him to retrieve it, and is close enough for him to get a good shot. Meanwhile, back in his right brain, someone’s keeping an eye out for trouble.

In order to reproduce, Butch must both survive the hunt and eat. The left brain focuses on the task at hand. The right brain keeps a lookout for anything that might require attention. The left brain ferrets out the details, while the right brain keeps those details in check by making sure they don’t contradict the big picture. The right brain also tries to tell the left brain that Butch can’t carry a hippo back to camp, but his left brain suppresses that warning with a cheerful but delusional reply: “It’s okay, as soon as I kill the hippo, I’ll invent the wheel!” His right brain sighs.

Your left brain is the one that takes you out on crazy fantasies, and your right brain reels you in. Your left brain can’t see the forest for the...

Table of contents

• Cover
• Title
• Copyright
• Table of Contents
• Chapter 1
• Chapter 2
• Chapter 3
• Chapter 4
• Chapter 5
• Chapter 6
• Chapter 7
• Chapter 8
• Chapter 9
• Chapter 10
• Bibliography
• From the Author
• Acknowledgments
• Note to You