Equation can predict how happy a person is in a single moment, claim scientists

Scientists used an app to test over 18,000 participants

While how to make people happy remains a tricky question, scientists claim to have created a mathematical equation to work out exactly how happy a person is at any given time.

According to a team of scientists, people are happiest when they perform better than expected in tasks involving a reward for taking a risk.

To build their formula, experts asked 26 people to repeatedly complete a decision-making task in which they would win or lose money.

The participants also had their brains scanned with an fMRI scanner.

Scientists noted that activity in two parts of the brain correlated with the happiness scores given by participants. The ventral stiatum, which sources dopamine neurons, was associated with changes in happiness, while the insula - which is important for emotions including joy – indicated overall levels of the emotion.

The resulting equation was then used to examine the emotions of 18,000 people who played a risk-reward game in the The Great Brain Experiment app, which offered a simplified version of real world scenarios.

Lead author Dr Robb Rutledge from University College London told BBC News that the equation published in the 'PNAS' journal shows it is possible to look at past decisions and outcomes to predict exactly how happy a person is at any point in time.

“The brain is trying to figure out what you should be doing in the world to get rewards, so all the decisions, expectations and the outcomes are information it's using to make sure you make good decisions in the future. All of the recent expectations and rewards combine to determine your current state of happiness,” he told the broadcaster.

He added that considering the large number of participants in the study, his team noticed a surprisingly consistent relationship between rewards, expectations, and happiness.

“I'm hopeful this mathematical equation lets us get a better understanding of things we all care about, like how happy we are in general,” Dr Rutledge said. 

Tom Stafford a cognitive scientist at the University of Sheffield, mirrored Dr Rutledge's response to the study, and said he was impressed that the equation could predict happiness with such accuracy.

However, he said it was not clear how the equation could be used to answer "big questions" which affect a person's happiness, like which partner to choose.

Voices
On the last day of campaigning before the polling booths open, the SNP leader has written to voters in a final attempt to convince them to vote for independence
voicesIs a huge gamble on oil keeping the First Minister up at night?
Life and Style
tech

Apple has been hit by complaints about the 1.1GB download

Arts and Entertainment
Liam Neeson said he wouldn't
tv

Liam Neeson's Downton dreams

Sport
A 'Sir Alex Feguson' tattoo
football

PROMOTED VIDEO
Arts and Entertainment
Ben Whishaw is replacing Colin Firth as the voice of Paddington Bear
tv

Thriller is set in the secret world of British espionage

Life and Style
life

Life and Style
fashion

Bomber jacket worn by Mary Berry sells out within an hour

Arts and Entertainment
Actor and director Zach Braff
tv

News
i100
Arts and Entertainment
Rosalind Buckland, the inspiration for Cider with Rosie died this week
booksBut what is it like to be the person who inspires a classic work of art?
News
i100
Arts and Entertainment
The former Doctor Who actor is to play a vicar is search of a wife
film

Matt Smith is set to join cast of the Jane Austen classic - with a twist

News
ebooksAn unforgettable anthology of contemporary reportage
Arts and Entertainment
Pointless host Alexander Armstrong will voice Danger Mouse on CBBC
tv

Much-loved cartoon character returns - without Sir David Jason

Arts and Entertainment
tv

Arts and Entertainment
Meera Syal was a member of the team that created Goodness Gracious Me
tv

Actress to appear in second series of the hugely popular crime drama

Arts and Entertainment
tvReview: An undercooked end (spoiler alert)
Life and Style
i100

Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

English Teacher Thetford Secondary

£110 - £150 per day: Randstad Education Cambridge: An Academy based in Thetfor...

Year 1 Teacher

£100 - £120 per day: Randstad Education Chelmsford: Would you like to work at ...

Data Analyst / Marketing Database Analyst

£24000 per annum: Ashdown Group: An established and growing IT Consultancy fir...

Business Analyst – 2 year fixed term contract – Kent – Circa £55k

£45000 - £55000 Per Annum 31 days holiday, pension, healthcare, annual bonus: ...

Day In a Page

Mystery of the Ground Zero wedding photo

A shot in the dark

Mystery of the wedding photo from Ground Zero
His life, the universe and everything

His life, the universe and everything

New biography sheds light on comic genius of Douglas Adams
Save us from small screen superheroes

Save us from small screen superheroes

Shows like Agents of S.H.I.E.L.D are little more than marketing tools
Reach for the skies

Reach for the skies

From pools to football pitches, rooftop living is looking up
These are the 12 best hotel spas in the UK

12 best hotel spas in the UK

Some hotels go all out on facilities; others stand out for the sheer quality of treatments
These Iranian-controlled Shia militias used to specialise in killing American soldiers. Now they are fighting Isis, backed up by US airstrikes

Widespread fear of Isis is producing strange bedfellows

Iranian-controlled Shia militias that used to kill American soldiers are now fighting Isis, helped by US airstrikes
Topshop goes part Athena poster, part last spring Prada

Topshop goes part Athena poster, part last spring Prada

Shoppers don't come to Topshop for the unique
How to make a Lego masterpiece

How to make a Lego masterpiece

Toy breaks out of the nursery and heads for the gallery
Meet the ‘Endies’ – city dwellers who are too poor to have fun

Meet the ‘Endies’ – city dwellers who are too poor to have fun

Urbanites are cursed with an acronym pointing to Employed but No Disposable Income or Savings
Paisley’s decision to make peace with IRA enemies might remind the Arabs of Sadat

Ian Paisley’s decision to make peace with his IRA enemies

His Save Ulster from Sodomy campaign would surely have been supported by many a Sunni imam
'She was a singer, a superstar, an addict, but to me, her mother, she is simply Amy'

'She was a singer, a superstar, an addict, but to me, her mother, she is simply Amy'

Exclusive extract from Janis Winehouse's poignant new memoir
Is this the role to win Cumberbatch an Oscar?

Is this the role to win Cumberbatch an Oscar?

The Imitation Game, film review
England and Roy Hodgson take a joint step towards redemption in Basel

England and Hodgson take a joint step towards redemption

Welbeck double puts England on the road to Euro 2016
Relatives fight over Vivian Maier’s rare photos

Relatives fight over Vivian Maier’s rare photos

Pictures removed from public view as courts decide ownership
‘Fashion has to be fun. It’s a big business, not a cure for cancer’

‘Fashion has to be fun. It’s a big business, not a cure for cancer’

Donatella Versace at New York Fashion Week