Richard G. Petty, MD

Conversation

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“The secret of pleasing in conversation is not to explain too much everything; to say them half and leave a little for divination is a mark of the good opinion we have of others, and nothing flatters their self-love more.”

–François, Duc de La Rochefoucauld (French Writer and Moralist, 1613-1680)

Why is Laughter Infectious?

When I was a very young student Monty Python’s Flying Circus was being shown on TV for the first time. The TV room in the halls of residence would normally be home to one or two sleeping stalwarts. But on Monty P. nights we would have seventy or eighty of us crammed into a small room: the sharing of laughter made the whole show ten times funnier.

I think that we’ve all had the experience of infectious laughter. It’s easy enough to see that it can be a social lubricant. But how does it work?

We have known for some time that when we are talking to someone, we often mirror their behavior, copying the words they use and mimicking their gestures. You may know that deliberately copying other people is a technique that we use when we are trying to influence others. It has seemed likely that the same applies to laughter.

Researchers at University College and Imperial College in London have shown that positive sounds such as laughter or a rousing and triumphant “woo hoo!” trigger a response in the listener’s brain. This response occurs in the regions of the brain that are activated when we smile, as though preparing our facial muscles to laugh. The research, funded by the Wellcome Trust, Action Medical Research and the Barnwood House Trust, is published in the Journal of Neuroscience.

The research team played a series sounds to volunteers whilst measuring their brain’s response using an fMRI scanner. Some of the sounds were positive, such as laughter or the triumphant woo hoo’s, while others were distinctly unpleasant, such as screaming or retching. All of the sounds triggered a response in the volunteer’s brain in the region of the premotor cortex. This is part of the brain that prepares the facial muscles to respond to emotion. The response was greater for positive sounds, suggesting that these were more contagious than negative sounds. The researchers believe that this explains why we respond to laughter or cheering with an involuntary smile.

When we are in a group and encounter positive emotions, the brain responds by automatically priming us to smile or laugh. This gives us a way of mirroring the behavior of others, which in turn helps our social interactions. Presumably it plays an important role in building strong bonds between individuals in a group.

There is a global movement which started in India called the laughter clubs, in which people get together to have a really good belly laugh. It has been claimed that these group giggles reduce the chance of developing depression. The data is not good, but there’s one thing for sure: it’s unlikely to cause you much harm.


“Laugh and the world laughs with you; cry and you cry alone.”

–Horace (a.k.a. Quintus Horatius Flaccus, Roman Poet and Satirist, 65-8 B.C.E.)

“What a force is laughter.”
–Alexander Solzhenitsyn (Russian Writer and, in 1970, Winner of the Nobel Prize in Literature, 1918-)

“The arrival in town of a good clown is of more benefit to the people than the arrival of 20 asses laden with medicine.”
–Thomas Sydenham (English Physician and a Founder of Modern Clinical Medicine and Epidemiology, 1624-1689)

Altruism and the Brain

There is a fascinating new study which will be out next month in the journal Nature.

Colleagues from Duke University Medical Center in Durham, North Carolina, believe that they have found a region of the brain that is associated with altruism: selfless concern for the well-being of others.

Some scientists have claimed that it is of no value because it has no survival advantage. I’ve never been able to agree with that extreme position. Another view is that the survival advantage comes from an ability to perceive the intention of others and therefore to anticipate their actions. I’m also not certain that this is genuine altruism, in the sense that altruism should be selfless.

45 volunteers were asked to play a computer game and also to watch the computer play the game. In some instances successful completion of the game resulted in the volunteers winning money for themselves, and in other instances it resulted in money being donated to a charity that each person had chosen at the beginning of the experiment. During these games the researchers took functional magnetic resonance imaging (fMRI) scans of the participants’ brains.

According to the old fashioned – and false – theory that pleasure and pain are THE main drivers of behavior, it was assumed that altruistic acts would activate the reward systems in the brain.

They do not.

A region of the brain called the posterior superior temporal cortex (pSTC) is activated by altruism and is very sensitive to the difference between doing something for personal gain and doing it for someone else’s gain. The pSTC appears to help us tune into perceiving and giving meaning to the actions of others. It is not focused on reward.

In the next stage of the research the participants were asked questions about the type and frequency of their altruistic or helping behaviors. The researchers then analyzed the responses to generate an estimate of a person’s tendency to act altruistically and compared each person’s level against their fMRI brain scan. The results showed that pSTC activity rose in proportion to a person’s estimated level of altruism. Note that it was their estimated level rather than their actual altruistic acts.

The suggestion by the researchers is that the ability to perceive other people’s actions as meaningful is critical for altruism.

I am going to be a Devil’s advocate and interpret the data differently. I think it more likely that people who have a good understanding of social relationships are more likely to do things for other people. Helping other just makes sense to you. Both the tests and the imaging could be interpreted in terms of social understanding and empathy. In other words we are looking at an aspect of social cognition.

There may also be another correlation here. Some years ago we showed that in people with chronic schizophrenia there is a shift in the handedness of a particular region of the brain called the planum temporale, which lies on the top of the temporal lobe. This lead to the hypothesis that when people are hearing voices, they really are hearing something being generated in the right hemisphere of the brain. People with schizophrenia sometimes have trouble with reading other people’s intentions and may attach meaning to random events. This new research mat help us understand why that can happen.

It also makes clinical sense: the best ways of helping people with mental illness who have these problems is to ensure that they are not on medicines that impair their social cognition, and to use social skills training.

“What we have done for ourselves alone dies with us; what we have done for others and the world remains and is immortal.”
–Albert Pike (American Lawyer, Masonic Author and Historian, 1809-1891)


“Spiritual energy flows in thankfulness and produces effects on the phenomenal world.”

–William James (American Psychologist and Philosopher, 1842-1910)

The Omnipresent Ohrwurm: Ten Secrets for Having an Idea Remembered

Last month I wrote something about a phenomenon that I’m sure that you’ve experienced: having a tune get stuck in your head. James Kellaris has used the term “Ohrwurm” to describe this phenomenon.

I made brief mention of the way in which research into the ohrwurm may inform other fields, such as addictions.

The other big topic that may be illuminated by the ohrwurm phenomenon is the way that ideas, trends and fashions gain traction.

Some successes are created: you may or may not like Madonna or Britney Spears, but both of them are talented. The question is this: why did they first make it? In some senses both had the right set of talents be molded into a highly successful products. People in the music business saw their potential and that both were just right for the market of the time. Thousands of similarly gifted people just never had the opportunity to be made into stars.

Some successes are the results of memes. I’m speaking here about memes with a little “M,” to differentiate them from the Memes of spiral dynamics. Ideas, fashions and trends spread through society like the measles.

But are there any characteristics of psychological or social ohrwurms? What is it about some ideas, concepts or products that just have a great big hook that makes them not just memorable but irresistible?

People have been asking that question for years, but now it begins to look as if we might be getting close to generating some sensible answers based not on market research or focus groups, but on neuroscience.

A book called Made to Stick will be coming out in the New Year and identifies some of the characteristics of ideas that become popular and stick in people’s minds. The authors’ have come up with:

  • Simple
  • Unexpected
  • Concrete
  • Credible
  • Emotional Story

I’m sure that they are on to something.

But I think that there is more.

In the original piece about the ohrwurm I mentioned three characteristics of a tune that gets stuck in our heads:

  • Simple
  • Incongruous
  • Repetitive

The same principles and a few more are crucial in getting a message to resonate:

  1. Simplicity: It’s much easier to believe that the motivators of human behavior are pain and pleasure, or that Men are from Mars and Women from Venus, than getting into the messy realities of human motivations and interpersonal relationships
  2. Clarity: The simple idea must be expressed in a cogent and incisive way
  3. Incongruity: This is essential: we know that the brain is hardwired to respond to novelty. Yet despite being incongruous, the odd, strange, unexpected idea must afterwards fit into the rest of our knowledge and beliefs about the world. We can only take so much incongruity!
  4. Repetition: Few ideas – whether true or false – are embraced and adopted if they are only heard once
  5. Emotional resonance: You are unlikely to be interested in or remember something that has no emotional meaning for you
  6. Integrity: The idea or concept must have internal consistency
  7. Believability: The idea needs to come from a trustworthy source
  8. Consonant: The idea or concept needs to resonate with your own core beliefs or core values
  9. Practical: Most people need to be able to see simple, concrete actions that they can take
  10. Beneficial: There is a sliver of self-interest within all of us: something else that is hardwired. Unless we can see that we will derive some benefit from an idea, it is unlikely to have much traction

Now I am going to let you in on a secret. I do a lot of public speaking and I could not work out why my talks, lectures and speeches seemed to be so popular.

One day a friend from Canada told me that he had also been mystified by my popularity as a speaker. Then he told me that he had discovered my secret: I am a storyteller. It took me a while to grasp what he was saying, but then I realized that it was true. Whether presenting research data, ways to improve your life or an inspirational speech I constantly tell stories. And so does every other good speaker that I know. And the keys to telling good stories?

They are these ten points.

Try them out for yourself and see what you think.

“A man’s success in business today turns upon his power of getting people to believe he has something that they want.”
–Gerald Stanley Lee (American Professor, Writer and Lecturer, 1862-1944)

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