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Authors: Matthew D. Lieberman

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Social: Why Our Brains Are Wired to Connect (44 page)

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I have also been blessed with the best students and staff in the world.
I’m so grateful that I’ve been able to spend my time thinking with everyone who has come through the UCLA Social Cognitive Neuroscience Laboratory: David Amodio, Elliot Berkman, Lisa Burklund, Liz Castle, Joan Chiao, Jessica Cohen, David Creswell, Molly Crockett, Janine Dutcher, Emily Falk, Ben Gunter, Kate Haltom, Erica Hornstein, Tristen Inagaki, Johanna Jarcho, Yoona Kang, Carrie Masten, Sarah Master, Meghan Meyer, Mona Moieni, Sylvia Morelli, Keely Muscatell, Junko Obayashi, Jenn Pfeifer, Josh Poore, Lian Rameson, Ajay Satpute, Julie Smurda, Bob Spunt, Golnaz Tabibnia, Eva Telzer, Sabrina Tom, Jared Torre, Stephanie Vezich, Baldwin Way, Locke Welborn, and Charlene Wu.
All of you are amazing.
Without my agent, Max Brockman,
this
book would never have existed.
He played the role of Socrates’ Daimon for a long time.
Thank you for saying no to the first several proposals I sent you over the course of two years and then finally saying yes when we got to this one.
As frustrating as those no’s were at the time, I shudder to
think of what I would have ended up with had you said yes to any of my initial proposals.
To my editor, Roger Scholl, and everyone at Crown—thank you so much for your help and support, every step of the way.
You have been fantastic to work with.
You made something incredibly daunting into something merely daunting.
As I began writing the book itself, I made a point of spending some time reading fiction every day to try to keep my mind nudged toward writing more like a novelist and a little less like an academic.
I read wonderful books by Haruki Murakami, Hugh Howey, Paul Auster, Michael Cox, David Mitchell, Kazuo Ishiguro, Philip K.
Dick, Matthew Mather, Ernest Cline, and Wilkie Collins.
Along similar lines, I’m glad I had Pandora on every day while I was writing with Tycho, Ulrich Schnauss, Riceboy Sleeps, Ambulance, William Orbit, Vector Lovers, Loess, Casino versus Japan, Broken-kites, Her Space Holiday, Deosil, Infinite Scale, Boards of Canada, Trentemoller, Eluvium, William Basinski, and Michael Maricle all in the mix.
All of you helped keep in me in the right frame of mind—absorbing the part of my mind that needed some level of constant distraction.
I’m grateful to my colleagues and friends who gave me feedback on particular chapters: Robin Dunbar, Sarah Endo, Dan Gilbert, Jonah Lehrer, Jenn Pfeifer, Eva Telzer, Nim Tottenham, and James Yang.
Special thanks go to the Neuroleadership Institute.
For years, you’ve allowed me to give talks to people who care about applying neuroscience findings in organizational and educational contexts, and this experience has shaped my thinking again and again.
In particular, I want to thank the folks who heard my plea for chapter reviews and went on to give me awesome feedback: Samad Aidane, Tom Battye, Marcy Beck, Pratt Bennet, Ken Buch, Corinne Canter, Christine Comaford, Garry Davis, Jon Downes, Barrie Dubois, Mary Federico, Sara Ford, Todd Gailun, Philip Greenwood, Robert Hutter, Shelley Johnson, Kory Kogon, Per Kristiansen, Kate Larsen, Dan Marshall, Jason Ollander-Krane, Bert Overlack, Thaler Pekar,
Lynn Quinn, Al Ringleb, Lisa Rubinstein, Sylvan Schulz, Mary Spatz, Bonnie St.
John, Robert Weinberg, Lucy West, Scott Winter, and Susan Wright.
I want to single out two people for high praise—each of whom was involved in more ways than I can count in bringing
Social
into existence (though neither is to blame for any of its imperfections).
First, David Rock, director of the Neuroleadership Institute.
Since our first (dodgy) meeting several years ago, you’ve pushed me to make the neuroscience relevant to non-neuroscientists and to work harder to learn to communicate better so I could do that.
Thank you for all the opportunities to connect at your summits with all the wonderful folks in the NLI world.
It has been transformative.
Thank you for reading the entire book and giving me line-by-line feedback.
Thank you for spending that day in San Francisco going over all the feedback and helping me brainstorm changes for the book.
Back when the book was only ten chapters, you wrote at the end: “nine chapters smart, one chapter useful!”
You challenged me to write new chapters on well-being and the workplace after I thought I had written the last word, and I believe the book is much better for it.
Finally, to Naomi.
There would be no book to write without you, and I certainly would not have been capable of writing it.
Since I came to UCLA, you have been my partner in work and in life.
Every bit of my science and every chapter of this book is better because of you.
And all the feedback you have given me on my writing has always made it better—every single time.
You are brilliant, and you amaze me again and again (and again).
I appreciate everything you have done for me so deeply—for this book, through our research at UCLA, and in our life together with Ian.

NOTES

Chapter 1: Who Are We?

4

The research my wife and I have done
Eisenberger, N. I., Lieberman, M. D., & Williams, K. D. (2003). Does rejection hurt? An fMRI study of social exclusion.
Science, 302
, 290–292.

6

Mondale, not exactly a spring chicken
Banville, Lee. (2002). “Former Vice President Walter Mondale (Democrat).”
Online NewsHour
. PBS. Retrieved March 26, 2011.

6

Social psychologist Steve Fein asked
Fein, S., Goethals, G. R., & Kugler, M. B. (2007). Social influence on political judgments: The case of presidential debates.
Political Psychology, 28
(2), 165–192.

7

Imagine watching the debate yourself
Pronin, E., Lin, D. Y., & Ross, L. (2002). The bias blind spot: Perceptions of bias in self versus others.
Personality and Social Psychology Bulletin, 28
(3), 369–381.

7

While we tend to think it is our capacity
Dunbar, R. I. M. (1998). The social brain hypothesis.
Evolutionary Anthropology, 6
, 178–190

8

In many situations, the more you turn on the brain network
Fox, M. D., Snyder, A. Z., Vincent, J. L., Corbetta, M., Van Essen, D. C., & Raichle, M. E. (2005). The human brain is intrinsically organized into dynamic, anticorrelated functional networks.
Proceedings of the National Academy of Sciences of the United States of America, 102
(27), 9673–9678.

11

In the toddler years, forms of social thinking develop
Herrmann, E., Call, J., Hernández-Lloreda, M. V., Hare, B., & Tomasello, M. (2007). Humans have evolved specialized skills of social cognition: The cultural intelligence hypothesis.
Science, 317
(5843), 1360–1366.

12

During the preteen and teenage years, adolescents
Costanzo, P. R., & Shaw, M. E. (1966). Conformity as a function of age level.
Child Development
, 967–975.

Chapter 2: The Brain’s Passion

15

In 1997, Gordon Shulman and his colleagues
Shulman, G. L., Corbetta, M., Buckner, R. L., Fiez, J. A., Miezin, F. M., Raichle, M. E., & Petersen, S. E. (1997). Common blood flow changes across visual tasks: I. Increases in subcortical structures and cerebellum but not in nonvisual cortex.
Journal of Cognitive Neuroscience, 9
(5), 624–647; Shulman, G. L., Fiez, J. A., Corbetta, M., Buckner, R. L., Miezin, F. M., Raichle, M. E., & Petersen, S. E. (1997). Common blood flow changes across visual tasks: II. Decreases in cerebral cortex.
Journal of Cognitive Neuroscience, 9
(5), 648–663.

17

The early name given to describe the network
Mckiernan, K. A., Kaufman, J. N., Kucera-Thompson, J., & Binder, J. R. (2003). A parametric manipulation of factors affecting task-induced deactivation in functional neuroimaging.
Journal of Cognitive Neuroscience, 15
(3), 394–408.

18

The second name given to this network
Raichle, M. E., MacLeod, A. M., Snyder, A. Z., Powers, W. J., Gusnard, D. A., & Shulman, G. L. (2001). A default mode of brain function.
Proceedings of the National Academy of Sciences, 98
(2), 676–682.

19

the network in the brain that reliably shows up
The story isn’t quite this simple. There is a small subnetwork of the default network that does not typically show up in studies of social cognition, but the vast majority of the two networks are overlapping.

20

One study looked at which brain regions were engaged
Gao, W., Zhu, H., Giovanello, K. S., Smith, J. K., Shen, D., Gilmore, J. H., & Lin, W. (2009). Evidence on the emergence of the brain’s default network from 2-week-old to 2-year-old healthy pediatric subjects.
Proceedings of the National Academy of Sciences, 106
(16), 6790–6795; Smyser, C. D., Inder, T. E., Shimony, J. S., Hill, J. E., Degnan, A. J., Snyder, A. Z., & Neil, J. J. (2010). Longitudinal analysis of neural network development in preterm infants.
Cerebral Cortex, 20
(12), 2852–2862.

20

the claim that Malcolm Gladwell made famous
Gladwell, M. (2008).
Outliers: The Story of Success
. New York: Little, Brown; Anders Ericsson, K. (2008). Deliberate practice and acquisition of expert performance: A general overview.
Academic Emergency Medicine, 15
(11), 988–994.

20

One study found that 70 percent of the content
Dunbar, R. I., Marriott, A., & Duncan, N. D. (1997). Human conversational behavior.
Human Nature, 8
(3), 231–246.

21

when Robert Spunt, Meghan Meyer, and I gave people only a few seconds
Spunt, R. P., Meyer, M. L., & Lieberman, M. D. (under review). Social by default: Brain activity at rest facilitates social cognition; Buckner, R. L., Andrews-Hanna, J. R., & Schacter, D. L. (2008). The brain’s default network.
Annals of the New York Academy of Sciences, 1124
(1), 1–38.

21

when you read the word “face”
Rubin, E. (1915/1958). Figure and ground. In D. C. Beardslee & M. Wertheimer (Eds.).
Readings in Perception.
Princeton: NJ: Van Nostrand, pp. 194–203.

21

You are more likely to see faces at first
Agafonov, A. I. (2010). Priming effect as a result of the nonconscious activity of consciousness.
Journal of Russian and East European Psychology, 48
(3), 17–32.

24

“general intelligence applied to social situations”
Wechsler, David (1958).
The Measurement and Appraisal of Adult Intelligence
, 4th ed. Baltimore: Williams & Wilkins, p. 75.

24

In a study of more than 13,000 people
Vitale, S., Cotch, M. F., & Sperduto, R. D. (2006). Prevalence of visual impairment in the United States.
JAMA: Journal of the American Medical Association, 295
(18), 2158–2163.

24

can we conclude our sociality is an accident
Stravynski, A., & Boyer, R. (2001). Loneliness in relation to suicide ideation and parasuicide: A population-wide study.
Suicide and Life-Threatening Behavior, 31
(1), 32–40.

24

Friendship has been documented in
Silk, J. B. (2002). Using the “F”-word in primatology.
Behaviour
, 421–446.

25

the closer friends become, the less they tend to keep
Fiske, A. P. (1991).
Structures of Social Life: The Four Elementary Forms of Human Relations: Communal Sharing, Authority Ranking, Equality Matching, Market Pricing
. New York: Free Press.

25

Americans spend 84 billion minutes per month
Bureau of Labor Statistics:
http://www.bls.gov/home.htm
.

25

we give an average of $300 billion a year
“U.S. charitable giving approaches $300 billion in 2011”:
http://www.reuters.com/article/2012/06/19/us-usa-charity-idUSBRE85I05T20120619
.

26

The brain regions reliably associated with general intelligence
Fox, M. D., Snyder, A. Z., Vincent, J. L., Corbetta, M., Van Essen, D. C., & Raichle, M. E. (2005). The human brain is intrinsically organized into dynamic, anticorrelated functional networks.
Proceedings of the National Academy of Sciences of the United States of America, 102
(27), 9673–9678.

26

the more this network turns on, the more the general
Van Overwalle, F. (2011). A dissociation between social mentalizing and general reasoning.
NeuroImage, 54
(2), 1589–1599.

26

To the extent that the social cognition network stays
Anticevic, A., Repovs, G., Shulman, G. L., & Barch, D. M. (2010). When less is more: TPJ and default network deactivation during encoding predicts working memory performance.
NeuroImage, 49
(3), 2638–2648; Li, C. S. R., Yan, P., Bergquist, K. L., & Sinha, R. (2007). Greater activation of the “default” brain regions predicts stop signal errors.
NeuroImage, 38
(3), 640–648.

27

A group of children with Asperger’s
Hayashi, M., Kato, M., Igarashi, K., & Kashima, H. (2008). Superior fluid intelligence in children with Asperger’s disorder.
Brain and Cognition, 66
(3), 306–310.

28

The human brain weighs in at about 1,300 grams
Roth, G., & Dicke, U. (2005). Evolution of the brain and intelligence.
Trends in Cognitive Sciences, 9
(5), 250–257.

29

newer parts of the brain, like the prefrontal cortex
Schoenemann, P. T. (2006). Evolution of the size and functional areas of the human brain.
Annual Review of Anthropology, 35
, 379–406.

30

In adult humans, the brain makes up approximately
Aiello, L. C., Bates, N., & Joffe, T. (2001). In defense of the expensive tissue hypothesis.
Evolutionary Anatomy of the Primate Cerebral Cortex.
Cambridge: Cambridge University Press, pp. 57–78; Leonard, W. R., & Robertson, M. L. (1992). Nutritional requirements and human evolution: A bioenergetics model.
American Journal of Human Biology, 4
(2), 179–195.

32

evolutionary anthropologist Robin Dunbar made the provocative claim
Dunbar, R. I. M. (1998). The social brain hypothesis.
Evolutionary Anthropology, 6
, 178–190.

32

Neocortex ratio
refers to the size of Neocortex
literally means “new cortex”; it’s the part of the cortex that is most different in structure in primates compared with other mammals.

32

When the relative size of the neocortex is correlated
Dunbar, R. I. (1992). Neocortex size as a constraint on group size in primates.
Journal of Human Evolution, 22
(6), 469–493; Sawaguchi, T. (1988). Correlations of cerebral indices for “extra” cortical parts and ecological variables in primates.
Brain, Behavior and Evolution, 32
(3), 129–140.

32

Later work demonstrated that these effects
Schoenemann, P. T. (2006). Evolution of the size and functional areas of the human brain.
Annual Review of Anthropology, 35
, 379–406.

32

This is referred to as “Dunbar’s number”
Dunbar, R. I. (2008). Why humans aren’t just Great Apes.
Issues in Ethnology and Anthropology, 3
, 15–33.

32

village size, estimated from as long ago as 6000 BC
Dunbar, R. I. (1993). Coevolution of neocortical size, group size and language in humans.
Behavioral and Brain Sciences, 16
(4), 681–693.

33

The most obvious advantage to larger groups
Hill, R. A., & Dunbar, R. I. M. (1998). An evaluation of the roles of predation rate and predation risk as selective pressures on primate grouping behaviour.
Behaviour
, 411–430.

33

Primates with strong social skills can limit
Silk, J. B. (2002). Using the “F”-word in primatology.
Behaviour
, 421–446.

34

When we reach Dunbar’s number
The formula for determining the number of dyadic permutations is [
N
* (
N
− 1)] / 2.

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