Metaphors Make Brains Touchy Feely


Metaphors Make Brains Touchy Feely

Mapping Metaphor.  Touching different textures activates certain areas of the brain, shown in yellow and red. But a new study finds that textural metaphors trigger a reaction, too (shown in green and, where overlapping, brown), in the parietal operculum.

The right turn of phrase can activate the brain’s sensory centers, a new study suggests.  Researchers have found that textural metaphors—phrases such as “soft-hearted”—turn on a part of the brain that’s important to the sense of touch. The result may help resolve a long-standing controversy over how the brain understands metaphors and may offer scientists a new way to study how different brain regions communicate.

  • The language-processing parts of volunteers’ brains became active regardless of whether the volunteers listened to the literal sentences or the metaphors
  • But textural metaphors also activated the parietal operculum, a region of the brain involved in feeling different textures through touch
  • That part of the brain didn’t light up when listening to a literal sentence expressing the same meaning as the metaphor.

The result suggests the brain’s grasp of metaphors is grounded in perception…This is pretty clear evidence” for the metaphor-through-perception camp”

“A subjective feeling of certainty provides no basis for knowledge”


“Biology, Training and Profit Sharing Make Best Traders” – ScienceDaily

Biology, training and profit sharing make best traders
ScienceDaily (Nov. 26, 2009) — Researchers have identified a group of traders consistently able to outperform the market, even during the credit crisis. The study by John Coates and Lionel Page of the University of Cambridge offers a rare glimpse into how biology, experience and compensation schemes work together to make a profitable and -- crucially -- a prudent risk taker.

The study, published in the open-access journal PLoS One, builds on previous research by Coates and colleagues that found higher levels of testosterone, in both the male foetus and the adult, predicted higher profitability among so-called 'high frequency' traders. It also casts doubt on the Efficient Market Hypothesis.

In the current study Coates and Page examine a more subtle measure of performance than profits -- a trader's Sharpe Ratio. This is the ratio between how much money a trader makes and the amount of risk taken in making that money.

According to Dr Coates, who previously ran a trading desk on Wall Street: "A trader making $100million would normally be considered a star, but not if the trader could just as easily have lost $500million. A trader's Sharpe Ratio is a better measure of skill than profits alone because it would expose this trader as reckless."

The authors calculated the Sharpe Ratios for 53 male high-frequency traders in the City of London. These are traders who buy and sell futures but hold their positions for only seconds or minutes. They then compared the traders' ratios for the period 2005-07 with the Sharpe Ratio of the Dax, the German stock market and the traders' benchmark index.

They found that:
Experienced traders in the study group (those trading for more than two years) had an average Sharpe of 1.02, significantly higher than the Dax, which averaged 0.53 during the same period.
Importantly, in a follow-up they ascertained that the experienced traders performed on average even better during 2008, a year in which many traders at other banks and hedge funds lost more money than they had made in the previous five years.

The out-performance of these traders is unlikely to be due to chance, say Coates and Page, because they also found that the Sharpe Ratios of these traders increased significantly the longer they had traded, indicating that they were learning to be more prudent risk takers.

The study casts doubt on the Efficient Market Hypothesis, which has over the past 20 years encouraged a laissez-faire attitude to the financial markets. According to this hypothesis the markets are random, so no one can consistently achieve a higher Sharpe Ratio than the broad market, and no one can improve at trading, just as no one can improve at flipping coins. The experienced traders in this study, however, were outperforming the market and were learning, implying that markets are not in fact efficient.

The study also sheds new light on Coates' previous finding that a surrogate measure of pre-natal testosterone exposure, the second to fourth finger length ratio (2D:4D), predicts a high frequency trader's lifetime profitability.  Coates and his colleagues could not say at that time if testosterone was affecting the amount of risk taken by the traders or the amount of money they made per unit of risk, i.e. their skill. They now find that 2D:4D does not predict Sharpe Ratios. Coates, now a research fellow in neuroscience and finance, says: "It seems testosterone affects the amount of risk traders take but not their skill."

The study has practical implications for banks and hedge funds which need to know, when allocating capital and bonuses, whether a trader's performance is due to skill or luck.

"Our study suggests a novel way of remunerating traders. Banks could use an improving Sharpe Ratio over time as a measure which reliably indicates a trader has developed a skill worth paying for," says Coates.

By paying bonuses on profits alone, however, the banks and hedge funds may have encouraged traders to maximize their risk, rather than Sharpe Ratios. "The traders in our study, on the other hand, received no bonus, only profit shares. They had therefore a strong incentive to lower, not raise, the variance of their profits," added Coates.

The study shows how biology and management can work together. Traders are risk takers so need a high tolerance for risk, a trait predicted by a measure of prenatal androgen exposure. "However, this trait, like height or speed in sports, may count for little without proper training and the right incentives. In trading, as in sports, biology needs the guiding hand of experience," he concluded.
Personality Predicts Cheating More Than Academic Struggles, Study Shows
ScienceDaily (Sep. 8, 2010) — Students who cheat in high school and college are highly likely to fit the profile for subclinical psychopathy -- a personality disorder defined by erratic lifestyle, manipulation, callousness and antisocial tendencies.  These problematic students cheat because they feel entitled and disregard morality, the study found.

With new technologies cheating may seem more apparent because we can more effectively detect it." Because it's hard or even dangerous to try to reform a psychopathic person, he recommends blocking cheating using other means.

Cheaters ranked high on personality tests of the so-called Dark Triad: 
Machiavellianism (cynicism, amorality, manipulativeness)
narcissism (arrogance and self-centeredness, with a strong sense of entitlement). 

Of the three dark personality types, psychopathy was most strongly linked to cheating. Cheaters  were spurred to cheat by two motivations, the research found: 

First, they sought to get the grades to which they felt entitled; second
They either didn't think cheating was wrong or didn't care.

Also anonymously, students were asked whether they had cheated on high-school tests or handed in essays copied from someone else. (Questions specifically referred to high school to allay concerns about admitting to cheating at the university.)
Each of the Dark Triad variables went hand in hand with cheating at a high level of statistical significance. The more likely people were to have cheated, the higher they ranked on the psychopathy scale, followed by Machiavellianism and narcissism.

People who were more conscientious and agreeable were significantly less likely to have cheated. Those low in conscientiousness were probably more likely to cheat because they were less prepared and more desperate, disagreeable students would by definition be less cooperative. However, the predictive power of those two core traits paled next to those of the Dark Triad.

Again, the Dark Triad and plagiarism were closely and significantly linked, with psychopathy leading the pack.  Although poor verbal skills were also tied to cheating, the association with psychopathy was tighter still.

The authors concluded that personality profiling can help predict cheating.

Analysis unearthed subgroups of people who felt that cheating was an appropriate strategy for reaching their ambitious goals, who were not afraid of punishment, or who were not morally inhibited. Psychopathy was significantly linked with all three motivations.

"Incentives seem to activate dishonesty in these individuals.  The achievement goals trigger cheating in psychopaths alone." Making it worse, moral deterrents don't matter to psychopaths, who scoff at social norms.

The authors caution that subclinical psychopaths are unlikely to exhibit the extreme behaviors of criminal psychopaths. Even with subclinical levels, however, it's nearly impossible and potentially dangerous to intervene with psychopaths.