By Daniel Hunter

People who believe they perform better under pressure are labouring under a false pretence, according to new research, which shows that acute stress can reduce a person's mental ability to "that of a small child".

Stress negatively affects people’s ability to think critically, use reasoning and make practical day-to-day decisions, the research by mutual healthcare providers Beneden Health showed.

Two groups of 100 people took part in simple tests, but with one group completing a series of stress-inducing tasks before and in-between trials. The aim was to measure how short-term stress affects critical thinking and decision-making abilities.

The results overwhelmingly showed that the stressed group were more likely to make the wrong decision, choose the wrong answer or react emotionally to an answer, such as make a snap judgement/decision based on a gut feeling.

Beneden Health said that these traits are similar to that of small children, who tend to react to problems they don’t quite understand with an emotional (snap) response, rather than a considered logical solution.

Richard Carlton-Crabtree, Services Director from Benenden Health’s counselling service provider, Insight Healthcare said: “The research demonstrates just how important it is that businesses ensure that staff feel comfortable and are not put under even minor stress whilst at work.”

One of the tests included in the research focused on critical thinking. These questions included problem solving, tested concentration and the respondents’ ability to work with a number of different facts at once.

The stressed group answered just 22% of the critical questions correctly, compared to 25% of the control group. This test created problems not unlike those that people would have to deal with in the workplace everyday, and with 88% of the participants reporting short-term stress has had a negative impact on their everyday lives, and 52% saying stress affected them at least every week — it’s clear that stress, coupled with problem solving and the need to think critically, is an unhappy and damaging partnership.

Practical decision making was also impaired, with the stressed group performing worse when presented with an important decision. Participants were asked to identify which house description out of three in the test was the best. Interestingly, 69% of the control group made the correct decision, compared to only 64% of the stressed group. A 5% difference between these small test groups shows that some of us are massively impacted by short-term stress, and are prone to make snap decisions about important life choices — such as buying a property.

The test that the stressed group found the most difficult was spatial abstract reasoning. This test looks at our ability to spot, manipulate and work with patterns and sequences. It is quite a difficult test overall, with only 44% of the control group answering all questions correctly. However, the stressed group managed just 39% - which could indicate that the more difficult the problem, the more likely stress is to affect the decision made.

Richard Carlton-Crabtree, added: “Many people harbour the view that a little bit of stress may be healthy as the added pressure that stress causes can positively affect their performance; but this research shows that even small amounts of stress can have negative effects. This should reassure people that they should seek help and support when the onset of stress begins, because it can have a detrimental effect from day one.

“These findings also show that 79% of people tend to deal with stress on their own — which is a concerning proportion. Social support and talking through stressful situations can be the best coping mechanism. That’s why Benenden Health offers a stress counselling service, where you can talk to someone on the phone and talk through your problems with someone equipped to help you cope and deal with them.”

Dr. David Lewis, Neuroscientist, said: "When stressed, the focus of our attention tends to narrow and, if associated with strong emotions, we tend to act less rationally on occasions. Of course, this depends both on the stressor and other factors such as personality and the coping strategies available to the individual. When stress arises unexpectedly and is especially overwhelming, rational thinking tends to be replaced by impulsive and often faulty decision making. This can be compared to a small child who responds emotionally to situations he or she finds stressful and frustrating."

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