Category: Intelligence

The foods can even restore memory in older people.

Flavanols, which naturally occur in fruit and vegetables, can make you smarter, new research finds.

People who consumed a cocoa drink laced with flavanols performed 11 percent faster on complex cognitive tests than those given a placebo.

Flavanols work by increasing blood oxygenation.

Flavanols are present in grapes, cocoa, apples, berries, tea and many other foods.

Dark chocolate is a particularly rich source of cocoa flavanols.

Dr Catarina Rendeiro, study co-author, said:

“Flavanols are small molecules found in many fruits and vegetables, and cocoa, too.

They give fruits and vegetables their bright colors, and they are known to benefit vascular function.

We wanted to know whether flavanols also benefit the brain vasculature, and whether that could have a positive impact on cognitive function.”

The small study included 18 people given either a flavanol-rich drink or a placebo.

Two hours later, brain scans showed that those who had consumed flavanols had blood oxygenation three times higher in response to hypercapnia.

Hypercapnia means the elevation of carbon dioxide in the bloodstream.

Dr Rendeiro explained the results:

“Our results showed a clear benefit for the participants taking the flavanol-enriched drink – but only when the task became sufficiently complicated.

We can link this with our results on improved blood oxygenation – if you’re being challenged more, your brain needs improved blood oxygen levels to manage that challenge.

It also further suggests that flavanols might be particularly beneficial during cognitively demanding tasks.”

Long-term flavanol consumption

Taking cocoa flavanols over the long term has also been linked to a variety of mental benefits.

In elderly people, they have been shown to improve cognitive performance, attention, processing speed and verbal fluency.

These effects are particularly strong among elderly people starting to see age-related mental decline.

One study, published in Nature Neuroscience, found a high-flavanol diet could restore aspects of older people’s memory back to that of a typical 30- or 40-year-old.

The study was published in the journal Scientific Reports (Gratton et al., 2020).

People with high intelligence tend to share this quality.

Intelligent people tend to be better behaved and less aggressive, research reveals.

Both boys and girls with higher IQs are less likely to be antisocial than those with lower IQs.

Boys who are not antisocial generally have IQs around 10 points higher.

Non-antisocial girls have IQs around 5 points higher than their antisocial peers.

High IQ is also linked to lower levels of aggression and drug abuse.

The results come from a group of over 1,000 children in England and Wales.

They were given tests of their IQ and externalising behaviour (aggression, antisocial behaviour etc.).

The study revealed that more intelligent children were less likely to exhibit antisocial behaviour.

The study’s authors write:

“Low IQ is a consistent risk factor for emergence and continuity of antisocial behavior across the life course in both prospective and cross-sectional studies, even when other relevant risk factors are statistically controlled.”

Genetic factors are likely important in the link, as well as situational factors, the authors write:

“…cognitive deficits might promote antisocial behavior if children with low IQs misunderstand rules, find it too difficult to negotiate conflict with words, find school frustrating, or become tracked with antisocial peers.”

The study was published in the Journal of Abnormal Psychology (Koenen et al., 2008).

The link helps explain ‘the halo effect‘, the idea that the mind assumes that what is beautiful is good.

Attractive people are also likely to be more intelligent, studies find.

People who are physically attractive can have IQs up to 14 percent higher than the less attractive.

The results come from data on 17,419 children in the UK who have been followed since 1958.

Attractive male children have 13.6 more IQ points than their unattractive peers.

Meanwhile, female children have 11.4 more IQ points.

This is the difference between being of average and high intelligence.

People unconsciously assume that better looking people are more intelligent.

It is part of what psychologists call ‘the halo effect‘: the mind assumes that what is beautiful is good.

Hollywood stars demonstrate the halo effect perfectly.

Because they are often attractive and likeable we naturally assume they are also intelligent, friendly, display good judgement and so on.

As the study’s authors write:

“Individuals perceive physically attractive others to be more intelligent than physically unattractive others.

While most researchers dismiss this perception as a ‘bias’ or ‘stereotype’, we contend that individuals have this perception because beautiful people indeed are more intelligent.”

The authors warn that the finding should not be used as the basis for discrimination or prejudice:

“Our contention that beautiful people are more intelligent is purely scientific.

It is not a prescription for how to treat or judge others.”

Tall and intelligent

A second sign of higher intelligence is being taller.

The reason is that the genes that are correlated with height are also correlated with intelligence.

The conclusion comes from a study of the DNA of 6,815 people.

Of course, there are still people who are short and intelligent, plus those who are tall and dim.

But, on average, there is a small association between being taller and having higher intelligence.

The studies were both published in the journal Intelligence (Kanazawa, 2011; Kanazawa & Kovar, 2004).

High intelligence is linked to holding certain attitudes, psychological research finds.

More intelligent people are less likely to be prejudiced against same-sex couples, research finds.

People of lower intelligence, though, are more likely to hold homophobic attitudes.

The conclusions come from an Australian study of 11,654 people who were given intelligence tests.

All were asked if they agreed with this statement:

“Homosexual couples should have the same rights as heterosexual couples do.”

Less intelligent people were more likely to be prejudiced on LGBT issues, the results showed.

People with low scores on the verbal ability test were particularly likely to be prejudiced.

Higher levels of education were, however, consistently linked to being less prejudiced.

Dr Francisco Perales, the study’s author, writes:

“Altogether, the findings provide clear evidence that cognitive ability is an important precursor of prejudice against same-sex couples.”

Dr Perales explained that studies have generally found that prejudice is more prevalent among people of low intelligence:

“Research conducted chiefly in the US, Canada and Western Europe reports correlations between low cognitive ability and support of prejudicial or non-egalitarian attitudes towards certain social groups (including ethnic minorities, migrants, women and people with AIDS), as well as related constructs, such as conservatism, ethnocentrism, authoritarianism,
and dogmatism.”

High IQ prejudice

Some psychologists, though, think this is not the whole story about the link between intelligence and prejudice.

A survey of 5,914  people in the US has tested prejudice against 24 different groups.

It found that both people of high and low intelligence are prejudiced — just against different groups.

People of higher intelligence showed prejudice towards groups perceived as conservative and conventional.

These included the military, Christians and big business.

Dr Mark Brandt, the study’s first author, explained:

“Whereas prior work by others found that people with low cognitive ability express more prejudice, we found that this is limited to only some target groups.

For other target groups the relationship was in the opposite direction.

For these groups, people with high levels of cognitive ability expressed more prejudice.

So, cognitive ability also does not seem to make people immune to expressing prejudice.”

The rather depressing conclusion is that most people are prejudiced against those they don’t agree with.

The studies were was published in the journals Intelligence and Social Psychological and Personality Science (Brandt & Crawford, 2016; Perales, 2018).

Thousands of people were asked how smart they wanted to be.

When asked, people choose an average IQ of around 130, research shows,

This level makes a person smart, mildly gifted even, but certainly not a genius.

In fact, people are surprisingly modest across a wide range of personal traits, when asked their ideal level.

When asked how long they’d like to live, the average is 90 years, which is only a little higher than normal life expectancy.

Even when given the option of taking a magic pill that gives eternal youth, they still only go for 120 years, on average.

Professor Matthew J. Hornsey, who led the research, said:

“Our research shows that people’s sense of perfection is surprisingly modest.

People wanted to have positive qualities, such as health and happiness, but not to the exclusion of other darker experiences — they wanted about 75% of a good thing.”

People who live in more holistic cultures — like Japan and China — were even more modest in the ideal levels they chose.

This reflects the fact that Eastern philosophies often emphasise the coexistence of good and bad.

Professor Hornsey explained:

“Interestingly, the ratings of perfection were more modest in countries that had traditions of Buddhism and Confucianism.

This makes sense — these Eastern philosophies and religions tend to place more emphasis on the notion that seemingly contradictory forces coexist in a complementary, interrelated state, such that one cannot exist without the other.”

The study’s conclusions come from 2,392 people in Australia, Chile, China, Hong Kong, India, Japan, Peru, Russia, and the United States.

The results showed that people were much more interested in being perfectly healthy than perfectly happy.

Professor Hornsey said:

“This principle of maximization is threaded through many prominent philosophical and economic theories.

But our data suggest that people have much more complex, blended notions of perfection, ones that embrace both light and dark.”

The study was published in the journal Psychological Science (Hornsey et al., 2018).

The personality traits that are signs of high intelligence.

People whose personalities are happy, energetic and lively have higher IQs, research finds.

Higher IQ is linked to experiencing more positive emotions, enjoying complex problems, having a larger vocabulary and understanding things more quickly.

The researchers found that smarter people were less stressed when given a taxing task to do.

They were also more engaged with it.

People with higher IQs were more likely to agree with statements like:

• I am quick to understand things.
• I have a large vocabulary and enjoy being intellectually engaged.
• I enjoy tackling difficult problems.

The more people agreed with statements like these, the higher their IQ was, researchers found.

The study included 440 people who completed surveys of their happiness and IQ.

The results showed that energetic lively people had higher fluid intelligence.

The study’s authors conclude:

“The results indicated that Intellect was generally associated with lower stress (low distress and worry and high task engagement) before and after intelligence tests.”

Fluid intelligence refers to the speed at which the brain works.

It is like the raw power of an engine or the speed at which a computer can process information.

Fluid intelligence is contrasted with crystallised intelligence.

Crystallised intelligence is something like general knowledge: the information that people have learnt about the world over the years.

The reason that IQ and happiness are linked could be down to how much importance is placed on being smart in Western cultures.

The authors write:

“It is striking that Intellect was correlated with affect even in Study 1, in which there was no requirement to perform an intellectual task.

At least in Western cultures, intellect may be of sufficient importance to the self-schema that it influences general emotional functioning.”

The study was published in the journal Personality and Individual Differences (Zajenkowskia & Matthews, 2019).

The surprising traits that indicate high intelligence.

Being genuine, cooperative and sincere are all linked to having a high IQ, research finds.

Although being ‘nice’ is not linked in the popular imagination with being intelligent, this study found that it was.

The study also found that half of the connection between high IQ and being ‘nice’ was down to genetics.

Other personality features that are linked to high IQ include being a seeker of variety, intellectually curious, imaginative and sensitive to emotions.

All of these are aspects of ‘openness to experience’, which is one of the five major aspects of personality.

Openness to experience is frequently strongly linked to high IQ by studies.

The study included 2,488 people who were given tests of personality and intelligence at 12 and 18-years-old.

Genetic modelling was used to examine the links between intelligence, personality and genes.

The results were explained by the study’s authors:

“Intelligence as measured by IQ was positively associated with
openness to experience and agreeableness.

Moderate phenotypic correlations [genetic associations] between agreeableness and IQ were also of interest.

Earlier studies reported small correlations between intelligence and agreeableness.

There have been a few studies on altruistic behavior in young children that found a positive relation with IQ.”

In fact, people with high IQs are better at working well with other people, other studies have found.

That is why those with high IQs are so essential: without them society would not work.

Being cooperative, in particular, may have strong links to higher IQ, the authors write:

“…unique aspects of human cognition are driven by social cooperation.

The cooperative attitudes of the subjects scoring high on agreeableness could therefore be the shared underlying factor in the relationship with IQ.”

The study was published in the journal Personality and Individual Differences (Bartels et al., 2012).

People with these two traits had higher crystallised intelligence.

Being open to new experiences and more extraverted are both linked to higher intelligence, research finds.

People who are open to experience tend to have a more active imagination, higher sensitivity to beauty and more intellectual curiosity, among other things.

Open people tend to retain general information better and they are also better at storing memories in the short term.

The results come from a survey of 381 people aged 19- to 89-years-old.

They were split into different groups depending on their cognitive performance.

The type of intelligence measured in the study is known as ‘crystallised’.

This refers to the ability to use learned information and is often tested through general knowledge and vocabulary.

In a twist to the findings, though, it turned out that some adults over 60 performed as well as younger people.

Among these people, it was being disagreeable that was linked to higher IQ.

Other research has also found that people who are highly intelligent tend to be independent and aloof.

The study’s authors conclude:

“The results also suggests that there are differences in personality–intelligence relationships between those who retain a normal level of overall cognitive ability in old age and those older adults who are cognitively superior.”

The study was published in the journal Personality and individual Differences (Baker & Bichsel, 2006).

Two signs of a knowledgeable personality.

Introverts who have more stable personalities have higher levels of general knowledge, research finds.

These two personality factors, along with being open to experience, predict people’s general knowledge.

General knowledge — or as psychologists call it, crystallised intelligence — is one of two broad aspects of intelligence.

General knowledge is often linked to success in life because innate talent is not enough — application matters.

The other type is called ‘fluid intelligence’, and refers to abstract reasoning and the speed at which the brain works.

The conclusions come from a survey of 201 university students in the UK.

All were given tests of the five major aspects of personality: neuroticism, extraversion, openness to experience, agreeableness and conscientiousness.

They were also asked general knowledge questions such as:

• Who discovered penicillin?
• Who wrote Anna Karenina?
• Which Beatle was shot in New York?

(The answers are: Alexander Fleming, Leo Tolstoy and John Lennon, respectively.)

The strongest predictor of people’s general knowledge was their cognitive ability.

In other words, people whose brains work faster absorb more knowledge over the years.

However, personality was also important in how much general knowledge people had picked up.

Having a stable personality (being non-neurotic) and being more introverted, were both linked to greater general knowledge.

Other studies have also consistently linked the personality trait of openness to experience to general knowledge.

People who are open to experience are more likely to be imaginative, sensitive to their feelings, intellectually curious and seekers of variety.

With increasing age, general knowledge becomes more important, the study’s authors write:

“…at more advanced stages of life, performance and achievement are best predicted by crystallized intelligence (gc), rather than the biologically-based, content-free, and so-called ‘‘culture-free’’ tests of fluid abilities (gf) (traditionally
regarded as the best measures of g).

It thus seems that the predictive power of gf tends to decline as individuals progress through the educational system, and as acquired information and learned skills play a greater role in determining job performance.”

The study was published in the journal Personality and Individual Differences (Chamorro-Premuzic et al., 2006).