Left vs. Right: What Your Brain Hemispheres Are Really Up To

• July 12, 2011 by Martha Burns, Ph.D

In the 1980’s, brain researchers viewed the two sides of the brain as dichotomously opposed: the right hemisphere was seen as a gestalt processor, good at “seeing the big picture,” while the left hemisphere was attributed with detail processing skills. Other views at that time attributed the left hemisphere with being more logical and analytical while the right hemisphere was considered more intuitive.^[i]

Some went so far as asserting that men and women exhibited different right vs. left preferences: men were attributed with stronger left hemisphere skills and women better right hemisphere skills. Although this male-female distinction was never empirically verified through research, the somewhat “pop-psychology” view that the right hemisphere is important for skills like music and art, predominated. In fact, there were books written instructing individuals on how to “draw with the right hemisphere” or how to “teach to the right hemisphere”.^[ii]

It now appears that some of these notions need to be revised.  A current view is that, for the majority of us, the right hemisphere is a pattern recognizer that may develop before the left. From this perspective, the right hemisphere enables a child to attend to and appreciate the gist of a sensory experience within each cognitive domain. For example, in acquisition of mathematical concepts, the right hemisphere may enable a young child to appreciate quantities in terms of more vs. less prior to assigning numerical values to the quantities (which would involve left hemisphere skills). There is research demonstrating that babies can discern a group of dots in terms of general aspects of quantity.^[iii]

Patricia Kuhl at University of Washington in Seattle has shown that typically developing infants show an interest in human voices over other environmental sounds like a car horn or doorbell, and direct their attention to human voice when it conveys information that is interesting.^[iv] Ultimately this may lead to an understanding of how the melody of a voice is used to convey a person’s intent.  In other words, recent research suggests that the right hemisphere may be best at processing patterns like voice contour, facial expression, aspects of size and quantity, gestalt aspects of the world which, from a developmental perspective, represent the way children begin to learn about cognitive areas like music, art, mathematics or language.

Considering the cognitive domain of music, for example, the right hemisphere appears to have a fundamental preference for recognizing melody, which allows a young infant to be interested in and ultimately reproduce early nursery songs. In the realm of visual processing, the right hemisphere has been shown to be better at perceiving the form or outline of an object than the details contained within the object.^[v]. And, similarly, although many people regard the left hemisphere as dominant for language, newer research has shown that the right hemisphere is superior at processing information like vocal inflection (prosody), and perhaps going directly from word to meaning, especially in very familiar phrases like idiomatic expressions (eg., “it is raining cats and dogs”) while the left hemisphere is more important for processing aspects of language that depend on analyzing the specific sequence of the sounds and words which are essential for understanding grammatical form of language and perceiving internal details of words.^[vi]

Several neuroscientists have accordingly revised and expanded the early right-left dichotomy to see the right hemisphere as preferential in processing form, structure, and perhaps, direct links to emotion,^[vii]  while the left hemisphere handles complex, rapidly changing stimuli, in which discerning the specific sequential order is critical to perception (as in speech perception, for example, where one must discern and order very rapidly changing complex acoustic events very quickly.)^[viii]

Another revision to the older view of right versus left hemisphere complements the view that the right hemisphere is preferential for pattern analysis, and comes from developmental neuroscience which has reported research that supports the contention that for most cognitive skills the right hemisphere matures before the left.^[ix] This certainly seems to the case when one looks at the early stages of neuronal development and migration in the fetal brain,^[x] and also the building of early axonal superhighways, as well as the research on myelination.^[xi] In fact, it may be that when this typical right to left maturation does not occur, developmental neurological abnormalities result. For example, there is some early research evidence that Autism Spectrum Disorders may represent one example of developmental deviations in this typical right-to-left developmental hierarchy.^[xii]

Although it may seem somewhat of a stretch from the early research in this area, one can observe how this organization might be reflected in early childhood development in the stages children pass through in the gradual mastery of skills. For example, when a child first begins to enjoy music, the observant adult notices that the child moves his or her whole body to the musical rhythm. For nursery songs, like “Twinkle Twinkle Little Star” the child often begins by humming the melodies. In both cases, this may represent right hemisphere processing.

In most cases, it will be a few years before the child will be able to read musical symbols which would presumably involve more left hemisphere skill. We do have research that shows that when three month old babies are first listening to oral language, the right hemisphere is much more active than the left.^[xiii] Patricia Kuhl has shown that mothers instinctively seem to match their speech to babies’ early developing perceptual preferences by exaggerating melodic inflection with young babies, probably reflecting their intuitive knowledge that they need to exaggerate the language cues (intonational contour and vocal inflection) that the right hemisphere seems to process preferentially while deemphasizing the production of the speech sounds themselves (left hemisphere preferences).^[xiv]
 

[i] Deutsch, Georg and Sally P. Springer. Left Brain, Right Brain: Perspectives From Cognitive Neuroscience . W.H. Feeman and Company/Worth Publishers. 2001.
[ii] Edwards, Betty. Drawing on the Right Side of the Brain. Penguin Putnam Press. 1999.
[iii] Xu, Fei et al. (2005) Number sense in human infants. Developmental Science. Vol. 8. 2005.
[iv] Kuhl, Patricia. Early Language Acquisition: Cracking the Speech Code. Nature Reviews Neuroscience. Vol 5. 2005.
[v] Devinsky, Orrin and Mark D’Esposito. Neurology of Cognitive and Behavioral Disorders. Oxford University Press. 2004.
[vi] Hickok, Gregory and David Poeppel. The Cortical Organization of Speech Processing. Nature Reviews Neuroscience. 2007.
[vii]Cahill, L. et al. Sex-Related Hemispheric Lateralization of Amygdala Function in Emotionally Influenced Memory: An fMRI Investigation. Learning and Memory. Vol. 11: 261-266. 2004
[viii] Tallal, Paula. Improving Language and Liteacy is a Matter of Time. Nature Reviews Neuroscience Vol. 5. 2004.
[ix] Huttenlocher, Peter. Morphometric Study of Human Cerebral Cortex Development. Neuropsychologia. Vol. 28. 1990.
[x] Galaburda, Albert et al. From Genes to Behavior in Developmental Dyslexia. Nature Neuroscience  Vol 9. 2006.
[xi] Herbert, Martha et al. Brain Asymmetries in Autism and Developmental Language Disorder: A Nested Whole-Brain Analysis. Brain: A Journal of Neurology.2004.
[xii] Herbert, Martha et al. Ibid.
[xiii] Hickock, Gregory and David Poeppel. Ibid.
[xiv] Kuhl, Patricia. Ibid.

Related Reading:

A Gymnast, a Cursor and a Monkey Named Aurora

7 Amazing Discoveries from Brain Research

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Categories: Brain Research, Reading & Learning

Tags: auditory processing, brain development, cognitive skills, infant brain, Innate abilities, language learning, memory, musical training, phonemic awareness

5 Paths To Brain Health: Tips From Dr. Paul Nussbaum

• July 5, 2011 by Carrie Gajowski

As the webinar coordinator here at Scientific Learning, I hosted yet another fascinating webinar about brain health with Dr. Paul Nussbaum in early May called “Brain Health Across the Lifespan”.  Dr. Nussbaum combined humor with interesting facts about the brain and the webinar ended up being one of our best sessions to date.  He provided a simple yet comprehensive look at the brain and how it functions. 

One interesting story Dr. Nussbaum shared was about the development and eventual delaying of the onset of Alzheimer’s disease based on lifestyle choices.  He cited research that has been done at autopsy that shows that there can be evidence of Alzheimer’s disease in the brain that has never manifested in memory problems during a person’s life.   

Dr. Nussbaum concluded that if you look at the individual’s life, you might find that they had a higher education level or more demanding occupation or participated in complex and varied activities throughout life, building up a stronger and more “fit” brain and delaying the onset of the disease.

He then covered 5 important aspects to brain health and suggested some activities that can keep your brain fit and healthy throughout your lifetime:

1. Nutrition:  Eat more “good” fats including Omega-3 fatty acids, more fruits and vegetables, and fewer “bad” fats and processed foods. 
2. Socialization:  Stay involved with life and develop a personal mission and hobbies along with building networks of family and friendships.
3. Physical Activity: Be mobile and active.  Walk, play, run, garden, exercise, bike, hike.  These activities can help reduce the risk of dementia later on in life.
4. Mental Stimulation:  Learn a second language, learn sign language, travel, play board games, and either play or listen to music.
5. Spirituality:  Slow down, meditate, and learn relaxation procedures.  Identify what your stressors are and how they affect you and then identify ways to handle them.

To find out more about Brain Health, watch our previously recorded webinar or visit Dr. Nussbaum’s website.

Related Reading:

Lifelong Leaning and the Plastic Brain

Educating Kids about Nutrition and the Brain

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Categories: Brain Fitness, Reading & Learning

Tags: brain training, cognitive skills, effort, exercise, health and well being, language learning, memory, musical training, play, Scientific Learning events, webinar

Antidotes to Summer Brain Drain (Part 2): 5 Ways to Pull the Plug on Learning Loss

• May 5, 2011 by Norene Wiesen

Last month Terri Zezula doled out tips for math skills practice over the summer.  But what about keeping up in reading and “staying in shape” for learning? 

Here are 5 more ways you can help your child stay sharp over the summer:

1. Read, Read, Read…and Understand

   If your child is working on basic reading skills such as phonics and decoding, provide plenty of opportunities to read silently and aloud.  Generate excitement about reading by helping your child create a reading list at the beginning of the summer.  Ask for recommendations from your child’s teacher and friends and from the children’s librarian at your local library.  If reading is a struggle for your child, take turns reading a story to each other.  Talk about the story.  Ask your child questions—what might happen next, and why?  What does your child think about what has happened so far? 

   If your child is good at decoding, broadening her exposure to life may be the key to improving reading comprehension^[i].  Find creative ways to associate new experiences with reading—such as pairing a field trip with a book.  After a trip to an art museum during which your teenager is taken by Matisse, visit the library for a book about Paris in the 20’s.  Or visit an observatory and follow up by reading about the constellations; then, take your child out into the dark night and see if you can identify the constellations yourselves.

2. Take Up a Musical Instrument

   Decades ago, families gathered in the evening to play music together.  Revive the tradition!  However poorly you might play, you’ll have fun together and stimulate your child’s brain to develop in beneficial ways.

   Research has shown that actively playing a musical instrument has positive effects on the brain.  In one study, six months of formal musical training resulted in positive changes for participants, such as improved perception of pitch in spoken language and improved processing of speech. The study authors concluded that a relatively short period of brain training—just 6 months—can have a significant, positive impact on the organization of children’s brains.

3. Cultivate a Growth Mindset

   Regardless of your child’s ability, the right attitude is essential in fostering risk-taking behavior and perseverance in learning. Research has shown that learners with a “growth mindset” who believe that their ability is fluid and that life is filled with opportunity thrive on new and challenging experiences, while those who believe their ability is fixed and unchanging are more likely to balk at challenges.

   To help your child develop a growth mindset:

   • Explain that the brain develops new neural connections in response to challenging learning experiences.
   • Give your child a challenge, and provide support by praising effort and progress rather than intelligence.
   • Model a growth mindset for your child – take on a challenging learning opportunity of your own and be up front when you encounter difficulties.  Talk with your child about how you plan to overcome obstacles that you encounter, and then follow through.
4. Give Your Child Stronger “Learning Muscles”

   All learning takes place on a foundation of critical cognitive skills, including memory, attention, processing, and sequencing.  A child must be able to hold information in working memory in order to complete all the steps in a multi-step task, and to stay focused on the task long enough to complete it.  A child’s brain must be able to process information rapidly enough to keep up with new incoming information, and to put all the elements in the right order to comprehend and use that information.

   Fun, web-enabled learning programs like BrainSpark® software (for learners who are on or above grade level) and BrainPro® software with tutoring (for learners who are below grade level and need some extra help) can help strengthen your child’s cognitive skills to accelerate learning.  Learners using these programs typically improve up to 2 years in reading level in just 12 weeks and often see improvements in other subjects that rely on reading as well, such as math and social studies.

5. Unstructured Play

   While it’s easy to write off summer vacation as downtime from learning, it’s important to remember the importance of unstructured play in a child’s development.  Summertime can provide your child the freedom and opportunity to grow and explore in ways not possible during the busy, and often over-scheduled, academic year.

   Your child uses play to develop a host of important characteristics such as self-confidence and creativity, as well as social skills like negotiation and working in groups.  Opportunities for active, physical play set the groundwork for lifelong healthy habits and promote physical well-being.  Physical activity is an effective way for the body to rid itself of the stress hormones^[ii] that build up during the challenges of daily life.  Make time for play.

6. [i] Strauss, Valerie. Active Summer, Active Minds: Educators Seek Ways to Prevent Learning Losses During Vacation. Monday, June 15, 2009.

   [ii] Cotman CW, Berchtold NC. Exercise: a behavioral intervention to enhance brain health and plasticity. Trends in Neurosciences.  2002; 25(6):295-301. doi:10.1016/S0166-2236(02)02143-4

   Related Reading:

   5 Reasons You Should Limit Screen Time

   Fit Bodies Make Fit Brains: Physical Exercise and Brain Cells

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Attend one of our popular webinars with thought leaders in learning. Live and pre-recorded webinars are available. Register today!

Categories: Brain Fitness, Family Focus, Reading & Learning

Tags: arts, auditory processing, child reading development, cognitive skills, emotions in learning, exercise, health and well being, how children learn, learning environment, learning through play, learning to read, literacy, motivating students, musical training, oral language skills, play, reading comprehension

4 Ways to Celebrate Brain Awareness Week 2011

• March 14, 2011 by Carrie Gajowski

It’s Brain Awareness Week! Join us every day from March 14-20 as we share information about the brain, how the brain learns, and how educators can address some of the challenges in education today.

Need some ideas for how to celebrate Brain Awareness Week and honor this most important of organs?

1. Incorporate “Brain Awareness” Into Your Classroom
   Need some ideas on this one? For starters, download some of our educational Classroom Resources for Teachers, a variety of fun and informative worksheets and experiments on topics related to the brain.  (My favorite is the Grocery Store Game, which tests memory span and mnemonic strategies.) Then have your students try our free Scientific Learning® BrainApps™ games for a brain fitness challenge!
   
   
2. Catch Up On the Best Blog Posts About the Brain
   Whether you’re new to this blog or a long time reader, there are sure to be some great posts you haven’t yet explored.  In celebration of Brain Awareness Week, here are some of the most popular brain-related posts: Educating Kids about Nutrition and the Brain – learn how you can create the ultimate brain-health meal, the "Brainiac Blue Plate Combo!” The Adolescent Brain –find out what your adolescent is really thinking and how his or her developing brain works. Benefits of Music in Schools: The Effects of Music on the Brain – check out what the latest research says regarding the importance of music education and its benefits for learning. Dr. Norman Doidge on Brain Plasticity – discover the truth…old dogs can learn new tricks, all lifelong.
   
   
3. Tweet the Brain, Learn, and Win
   This week on Twitter, we will be testing your knowledge of the brain.  Play with us for a chance to win one of our “brain” goody bags each day!  Follow @brainfitness and join in the fun! 
   
   
4. Subscribe to Receive All of Our Brain Awareness Week Posts
   Subscribe to this blog (below) to have our blog posts show up in your inbox during Brain Awareness Week and beyond. Thanks for joining us for Brain Awareness Week!  All of The Science of Learning bloggers look forward to sharing it with you!

Subscribe to this blog to get new blog posts right in your inbox and stay up to date on the science of learning!

Attend one of our popular webinars with thought leaders in learning. Live and pre-recorded webinars are available. Register today!

Categories: Brain Fitness, Education Trends, Family Focus, Reading & Learning

Tags: brain plasticity, health and well being, high school learning, middle school learning, motivating students, musical training, nutrition, science, Scientific Learning events

Listen: Don’t Ignore the Benefits of Music on the Brain

• November 4, 2010 by Bill Jenkins, Ph.D.

Educators, researchers and education policy-makers have long discussed the benefits of structured music education. In today's environment of shrinking district resources, the arts are often early arrivals to the budgetary chopping block. Certainly, math, science, language arts and social studies are essential subjects, but we must also understand exactly what is lost when we cut arts programs. When we let go music education, we let rest layers upon layers of essential learning.

• We lose the cultural understanding and historical knowledge that accompanies such training.
• We remove an environment and a medium that is highly conducive to the acquisition and honing of essential skills for workplace success such as collaboration and creativity.
• We lose proven benefits to learning and brain function. Through the mechanisms of brain plasticity, music contributes to the development of listening and cognitive skills essential for language.

While all of these losses are arguably of equal importance, I wish to focus on the last. In their August 2010 article Music Training for the Development of Auditory Skills, Nina Kraus and Bharath Chandrasekaran present the neuroscience research demonstrating that music training, in the same way that physical exercise impacts body fitness, "tones the brain for auditory fitness." Specifically, Kraus and Chandrasekaran examine three specific areas of brain function where music training positively affects function:

• Transfer of cognitive skills: Music has been shown to affect how the brain processes pitch, timing and timbre. Along with describing music, these are also key elements of speech and language—that are positively affected by musical training.
• Fine tuning of auditory skills: "Musicians, compared with non-musicians, more effectively represent the most meaningful, information-bearing elements in sounds — for example, the segment of a baby's cry that signals emotional meaning, the upper note of a musical chord or the portion of the Mandarin Chinese pitch contour that corresponds to a note along the diatonic musical scale." While music does not appear to affect visual memory or attention, research shows that it does affect auditory verbal memory and auditory attention.
• Better recognition of "regularities": The human brain is wired to filter regular predictable patterns out from the noise surrounding us (e.g., we can pick out a friend's voice in a room filled with many other sounds and voices.) Musical training enhances this cognitive ability.

Based on this information, Kraus and Chandresekaran argue "that active engagement with music promotes an adaptive auditory system that is crucial for the development of listening skills. An adaptive auditory system that continuously regulates its activity based on contextual demands is crucial for processing information during everyday listening tasks."

Kraus and Chandresekaran end their article with a discussion of the implications for education. All of the skills and abilities discussed above clearly have the potential to impact student success and achievement "by improving learning skills and listening ability, especially in challenging listening environments."  Whether considered as content, as skills or as brain processing exercise, the benefits of music should be carefully weighed as we evaluate its place in the school day.

For additional reading on the positive effects of music education, check out:

• This article about the benefits of music education at the Children's Music Workshop.
• The NAMM Foundation Supports Music (and this PowerPoint presentation of the research on the positive effects of music education)

 

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Categories: Brain Fitness, Brain Research, Education Trends, Reading & Learning

Tags: academic success, arts, brain plasticity, cognitive skills, creativity, musical training

Musical Training and Cognitive Abilities

• August 5, 2010 by Bill Jenkins, Ph.D.

The debate over music and its benefits for the development of early cognitive abilities have raged now for almost two decades. Can classical music transform children into smarter, more effective learners? Today's research indicates that the clear answer is that this is the wrong question. The question is this: What are the differences in the effects of passively listening to music vs. active musical training upon cognitive abilities?

On passive listening
Ever since French researcher Dr. Alfred A. Tomatis, in his 1991 book Pourquoi Mozart?, put forth the assertion that listening to the music of Mozart can retrain the brain, laypeople and researchers alike have been on the hunt for evidence to support his claims. Two years later, University of California at Irvine psychologist Frances H. Rauscher reported findings demonstrating that passively listening to Mozart's music enhanced college students' cognitive abilities. (Such claims gave rise to numerous products that were aggressively marketed to parents, the most popular being the highly scrutinized Baby Einstein series. See this 2009 article in the NY Times.)

While they garnered a fantastic amount of attention, researchers around the world have been highly skeptical of Rauscher's conclusions. Today, numerous studies have demonstrated that, alas, passively listening to music will not transform babies' brains into mini computational powerhouses. See this May 10, 2010 article in Science News.

On active training
All this does not translate to the conclusion that there is no educational benefit to music. I'm happy to report that active musical training, such as taking formal lessons in learning to play the piano or read music, does produce substantive positive changes in the brain in children as well as adults. As we know, the brain is plastic; it changes based on how it is exercised. (That is why we talk so much about brain fitness at Scientific Learning.)

In contrast to Tomatis and Raucher's work in passive musical listening, last year a team of European researchers published a study entitled, "Musical Training Influences Linguistic Abilities in 8-Year-Old Children: More Evidence for Brain Plasticity." Researchers tested thirty-two non-musician children over nine months to look at their predispositions for music, as well as to measure the effects of musical training upon non-musical functions.

Remarkably, they found that just six months formal musical training had positive affects upon subjects' abilities in speech. Specifically, subjects' musically trained ears allowed them to better discern differences in pitch. Further, this research supported the idea of brain plasticity in showing that even short periods of training the brain can have large effects upon brain function.

But how does musical training affect language processing in adults? Again, the research clearly outlines the positive affects, demonstrating that brain plasticity continues on through adulthood:

• Schon, Magne and Besson published in 2004 demonstrated that training helps adults process not only music, but also speech. In studying the perception of fundamental frequency--the lowest threshold of audible tones--in eighteen musicians and non-musicians (mean age of 31), results showed that extensive musical training does have a clear affect on "the perception of pitch contour in spoken language."
• The research from Gabb, Tallal, Kim, Laskminarayanan, Archie, Glover and Gabriela suggests that musical training actually "changes the neural network involved in rapid spectrotemporal processing so that it overlaps primarily with brain areas traditionally associated with language processing (e.g., Broca's region)."

The significance of all this research is clear; don't just listen to the music. Take up producing your own and you'll be rewarded with all that music has to offer, while gaining improved brain function as a bonus.

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Categories: Brain Fitness, Brain Research, Reading & Learning

Tags: auditory processing, brain plasticity, brain training, cognitive skills, early learning, effort, elementary learning, elementary school learning, language learning, musical training, oral language skills, processing