Category: Intelligence

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).

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).

One more benefit of being above average in intelligence.

People with higher IQs are likely to live longer, according to research.

Those with high intelligence in childhood are less likely to get heart disease, strokes, respiratory diseases and dementia later on.

Higher intelligence may allow people to learn better health behaviours and cope more effectively with problems over the years.

Some of the lowered risk is down to the fact that more intelligent people are less likely to smoke.

The conclusions come from a Scottish study that included 938 people who were followed for over 25 years.

The results showed that for every 15 points of higher IQ, people’s risk of dying was reduced by 17 percent.

This study found the link between IQ and longevity was strongest in children brought up in poorer neighbourhoods.

Higher intelligence, then, is particularly beneficial to the longevity of poorer people, said Dr Carole L. Hart, the study’s first author:

“The significant interaction found between IQ and deprivation suggests that IQ in childhood is less important in terms of mortality for people who live in more affluent areas in adulthood than for people who live in deprived areas.”

It is not yet clear how IQ is related to longevity, said Dr Hart:

“It is possible that low childhood IQ leads to adult deprivation, which in turn leads to earlier death.”

Some studies have suggested that IQ and longevity are linked to the same sets of genes.

Another possibility is that adverse circumstances, which are often linked to being poor, can lower IQ.

Worse nutrition, educational opportunities and deprived areas may all take their toll on mental development.

Other studies have also suggested that higher IQ leads to a longer life.

The study was published in the journal Psychosomatic Medicine (Hart et al., 2003).

One common sign of high IQ is obvious in childhood.

Learning to read at an earlier stage is a sign of higher IQ, a study finds.

The better a person’s reading skills at age 7, the higher their intelligence in later life.

It may be that reading from an earlier age helps to improve IQ.

If this is true, then helping children to read sooner may boost their intelligence.

Dr Stuart J. Ritchie, the study’s first author, said:

“Since reading is an ability that can be improved, our findings have implications for reading instruction.

Early remediation of reading problems might aid not only the growth of literacy, but also more general cognitive abilities that are of critical importance across the lifespan.”

The conclusions come from a study of 1,890 twins whose IQ and reading levels were tested between the ages of 7 and 16.

Twins were included because the researchers wanted to rule out the effect of the environment and genes.

It emerged from the results that among each pair of twins, the one that began to read earlier had a higher IQ later on.

Dr Ritchie said:

“If, as our results imply, reading causally influences intelligence, the implications for educators are clear.

Children who don’t receive enough assistance in learning to read may also be missing out on the important, intelligence-boosting properties of literacy.”

Dyslexia

Dyslexia — a type of learning difficulty causing problems with reading and writing — is not a sign of low IQ.

Professor John D. E. Gabrieli, who has published research on dyslexia and IQ, said:

“We found that children who are poor readers have the same brain difficulty in processing the sounds of language whether they have a high or low IQ.

Reading difficulty is independent of other cognitive abilities.”

The study was published in the journal Child Development (Ritchie et al., 2015).