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Thermal images reveal stress’s physical effects on the body

A BBC reporter underwent a stress test using a thermal camera, a procedure specifically devised by psychologists.

A recent experiment had me facing a panel of three strangers, tasked with delivering a five-minute impromptu speech, followed by counting backwards in intervals of 17, all while being filmed by psychologists from the University of Sussex for a stress research project utilizing thermal cameras.

The study, led by psychologists at the University of Sussex, aims to investigate stress using thermal imaging, which captures changes in blood flow in the face, particularly the drop in nose temperature, as an indicator of stress levels and recovery.

According to scientists, stress causes a shift in blood flow, resulting in a decrease in nose temperature, which can be measured to monitor stress levels and track recovery, offering a potential new method for assessing stress.

The researchers believe that thermal imaging could be a significant breakthrough in stress research, providing a non-invasive and objective measure of stress levels.

The experimental stress test was designed to be a controlled and unpleasant surprise, with participants, including myself, arriving at the university without prior knowledge of the tasks they would be required to perform.

The picture shows two thermal images - side by side - of the same woman. In the thermal image on the left, her face looks yellow and red, indicating warmth. In the thermal image on the right, her nose is blue. It has cooled down as she has been stressed by the task she is being asked to complete.
The temperature drop in the nose, seen in the thermal image on the right, happens because stress affects our blood flow.

The test began with a calming exercise, where I was asked to sit, relax, and listen to white noise through headphones, setting a baseline for my stress levels.

Initially, the experience was soothing, but this calm was short-lived.

The researcher then introduced a panel of three strangers, who silently observed me as I was given three minutes to prepare a five-minute speech on my "dream job," a task that induced significant stress.

As I struggled to prepare my speech, the thermal camera captured the changes in my face, including a drop in nose temperature, which appeared as a blue color on the thermal image, indicating my increasing stress levels.

The University of Sussex researchers conducted this stress test on 29 volunteers, all of whom exhibited a drop in nose temperature ranging from three to six degrees during the experiment.

My own nose temperature decreased by two degrees as my body responded to the stress by redirecting blood flow away from my nose and towards my eyes and ears, a natural response to perceived danger.

Most participants, including myself, recovered quickly from the stress, with our nose temperatures returning to pre-stress levels within a few minutes.

Lead researcher Prof Gillian Forrester noted that my experience as a reporter and broadcaster likely contributed to my ability to cope with the stress of the situation, making me more resilient to social stressors.

Prof Forrester explained that my profession has likely habituated me to stressful situations, allowing me to manage my stress response more effectively than others might.

Despite my resilience, the experiment still induced a significant biological response, as evidenced by the change in my nose temperature, demonstrating the robustness of this marker for stress.

Stress is an inherent part of life, but this discovery could lead to the development of new methods for managing harmful stress levels.

a video camera viewfinder shows the correspondent's thermal image while the correspondent herself is blurred out in the background.
The 'nasal dip' happens in just a few minutes when we are acutely stressed

According to Prof Forrester, the time it takes for an individual to recover from the stress-induced drop in nose temperature could serve as an objective measure of their ability to regulate stress.

This measure could potentially be used to identify individuals at risk of anxiety or depression, allowing for early intervention and support.

The non-invasive nature of thermal imaging makes it a valuable tool for monitoring stress in individuals who cannot communicate effectively, such as babies or people with certain disabilities.

The second task in the stress assessment, counting backwards from 2023 in intervals of 17, proved to be an even more challenging and stressful experience for me, particularly with the added pressure of being observed by the panel of strangers.

I found the mental arithmetic required for this task to be extremely difficult, leading to feelings of frustration and embarrassment.

As I struggled to complete the task, I became increasingly uncomfortable, feeling a strong desire to escape the situation.

Despite the challenges, only one of the 29 volunteers opted to leave the experiment, while the rest, including myself, persisted and completed the tasks, albeit with varying degrees of distress.

Prof Forrester is scheduled to present this new thermal stress-measuring method at the New Scientist Live event in London on 18 October.

One of the most interesting aspects of this approach is its potential application beyond human subjects, as thermal cameras can measure stress responses in non-human primates, such as great apes.

The researchers are currently exploring the use of thermal imaging in ape sanctuaries to help reduce stress and improve the wellbeing of rescued animals, including chimpanzees and gorillas.

Preliminary findings suggest that showing adult chimpanzees video footage of baby chimpanzees can have a calming effect, as evidenced by an increase in nose temperature, indicating reduced stress levels.

In contrast to the stressful experience of the surprise job interview or mental arithmetic task, watching baby animals play appears to have a soothing effect on great apes.

The use of thermal cameras in ape sanctuaries could provide valuable insights into the stress levels of rescued animals, helping caregivers to create a more supportive environment and facilitate their adjustment to new social groups and surroundings.

A thermal image of a chimpanzee in captivity. Its face is yellow and red, indicating warmth.
Chimpanzees and gorillas in sanctuaries may have been rescued from traumatic circumstances

Marianne Paisley, a researcher from the University of Sussex, noted that great apes often mask their emotional states, making it challenging to assess their wellbeing, but thermal imaging can help to overcome this limitation.

By applying our knowledge of human mental health to the study of great apes, we can work towards improving their wellbeing and giving back to these animals that have been the subject of scientific study for over a century.

The researchers hope that their work will contribute to a better understanding of great ape wellbeing and ultimately lead to improved care and support for these animals.

My participation in this experiment, although minor, may have contributed to a greater understanding of stress and its effects, potentially benefiting not only humans but also our primate cousins.

Additional reporting for this story was provided by Kate Stephens, with photography by Kevin Church.

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Study Explores if Brain Stimulation Can Reduce Selfish Behavior

Researchers have found a way to temporarily and marginally decrease self-centered behavior in individuals by activating two specific regions of the brain.

Researchers have made a groundbreaking discovery, finding that temporary reductions in selfish behavior can be achieved by stimulating specific areas of the brain.

The image shows a brain scan seen from the dront of the head. The lobes of the brain are artifically coloured in bright red and you can see the pink outline of a person's skull around the brain.

A recent study conducted at the University of Zurich involved 44 participants who were tasked with dividing a sum of money between themselves and an anonymous partner, allowing scientists to observe their decision-making processes.

The experiment utilized electrical current to stimulate the frontal and parietal regions of the brain, located at the front and rear of the skull, respectively. When these areas were stimulated simultaneously, participants exhibited a greater willingness to share their funds.

According to Prof Christian Ruff, a lead author of the study, the observed effects were consistent, albeit modest in scale.

Statistical analysis revealed a notable increase in participants' willingness to allocate funds to others, indicating a shift in their behavior.

The findings not only provide insight into the neural mechanisms underlying fundamental human behavior but may also have implications for the treatment of certain brain disorders characterized by impaired social behavior.

Prof Ruff noted that some individuals struggle with profound social difficulties due to an inability to consider others' perspectives, leading to consistently selfish behavior, and suggested that this discovery could potentially be used to address such issues.

However, the effects of the brain stimulation were found to be short-lived, suggesting that repeated application may be necessary to achieve lasting changes.

Prof Ruff likened the potential effects of repeated stimulation to the benefits of regular exercise, stating that consistent application over a prolonged period could lead to significant changes in behavior, much like the physical adaptations that occur with regular gym attendance.

This latest discovery builds upon a previous study in which researchers monitored brain activity while participants engaged in a similar money-sharing game, providing a foundation for the current findings.

A participant receiving non-invasive brain stimulation during an experiment in a laboratory setting. The volunteer sits in the foreground with another person, whose hands can be seen, holding a scanning device over the person's head. A scan of their brain is visible on a screen behind.

The earlier study identified two brain regions that appeared to be synchronized, with neural activity occurring at the same frequency, when participants made more generous decisions.

These brain areas are known to play a crucial role in decision-making and empathy, enabling individuals to distinguish between their own feelings and those of others.

When participants made selfless decisions, the regions responsible for empathy and decision-making were found to be communicating with each other.

The researchers sought to investigate whether electrical stimulation could be used to influence this communication and promote more selfless decision-making.

One participant who underwent the brain stimulation test described the experience as a gentle, soothing sensation, comparable to a warm shower or light rain on the scalp.

The participant reported making decisions while receiving the stimulation without feeling any external influence on their choices.

The discovery of a consistent neural pattern associated with selfless decision-making across multiple individuals suggests that altruism may be an innate, evolutionarily conserved trait that enables humans to care for one another.

Prof Ruff emphasized the clinical significance of this finding, highlighting the potential to modify and influence this neural mechanism.

Dr Jie Hu, a co-author of the study, noted that the research provides evidence of a causal relationship between brain activity and decision-making, demonstrating that targeted stimulation can alter an individual's sharing behavior.

By manipulating communication within a specific brain network using non-invasive stimulation, the researchers observed a shift in participants' decisions, influencing the balance between self-interest and altruism.

Addressing concerns about the potential implications of this research, Prof Ruff assured that the experiment was conducted with strict adherence to medical regulations and ethical guidelines, ensuring the well-being and informed consent of all participants.

The neuroscientist drew a distinction between the controlled, medically regulated nature of the experiment and the often-subliminal influences of social media and advertising, which can affect behavior without explicit consent.

Prof Ruff suggested that, in contrast to the experiment, the impacts of social media and advertising on brain function and behavior are often unforeseen and uncontrolled, highlighting the importance of careful consideration and regulation in such contexts.

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NHS Workers to Receive 3.3% Pay Increase

Labor unions have expressed displeasure, yet the government maintains that its actions showcase a dedication to its workforce.

The government has confirmed that NHS staff in England will receive a 3.3% pay increase in the upcoming financial year.

Nurses on a ward, checking patient notes

This pay award applies to approximately 1.4 million health workers, including nurses, midwives, physiotherapists, and porters, but excludes doctors, dentists, and senior management.

Although the Department of Health and Social Care initially proposed a lower figure, it has accepted the recommendation of the independent pay review body to demonstrate its commitment to NHS staff, resulting in a higher pay rise than initially suggested.

However, several health unions have expressed disappointment with the announced pay award.

Prof Nicola Ranger, general secretary of the Royal College of Nursing (RCN), noted that the 3.3% increase falls short of the current consumer price index (CPI) inflation rate of 3.4%, which measures the rise in prices over the past year.

Prof Ranger stated, "A pay award that is lower than the current inflation rate is unacceptable, and unless inflation decreases, the government will be imposing a real pay cut on NHS workers."

She criticized the government's approach, saying, "This strategy of making last-minute decisions is not an appropriate way to treat individuals who are essential to a system in crisis."

Prof Ranger indicated that she would wait to see the pay awards for the rest of the public sector and doctors before deciding on a course of action.

The RCN had previously reacted strongly to the 5.4% pay increase received by resident doctors last year, compared to the 3.6% increase received by nurses, which they described as "grotesque".

Prof Ranger emphasized, "Nursing staff will not accept being treated with disrespect, as has happened in the past when they were given lower pay awards than other groups."

Helga Pile, head of health at Unison, the largest health union, commented, "NHS staff who are already under financial pressure will be outraged by another pay award that fails to keep up with inflation."

"Once again, they are expected to deliver more while their pay effectively decreases, as it falls behind the rising cost of living," she added.

In response, the government argued that the pay award is actually above the forecasted inflation rate for the coming year, which is around 2%.

A spokesperson for the Department of Health and Social Care stated, "This government greatly values the outstanding work of NHS staff and is committed to supporting them."

The pay increase is expected to be implemented by the start of April.

However, the government did not provide a timeline for the announcement on doctors' pay, as the pay review body responsible for making recommendations on their pay has yet to submit its report to ministers.

The government is currently engaged in negotiations with the British Medical Association regarding the pay of resident doctors, previously known as junior doctors.

Members of the BMA recently voted in favor of strike action, granting them a six-month mandate for walkouts, and there have been 14 strikes so far in the ongoing dispute.

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NHS Waiting List Hits Three-Year Low

In England, the backlog has fallen below 7.3 million for the first time since 2023, yet worries persist regarding prolonged waiting times in accident and emergency departments.

England's hospital waiting list has reached its lowest point in almost three years, marking a significant milestone in the country's healthcare system.

A group of surgeons operating on a patient in theatre

As of December 2025, the number of patients awaiting treatment, including knee and hip operations, stood at 7.29 million, the lowest figure recorded since February 2023.

However, the latest monthly update from NHS England reveals that long wait times persist in Accident and Emergency departments, with a record number of patients experiencing 12-hour trolley waits.

In January 2026, over 71,500 patients spent more than 12 hours waiting for a hospital bed after being assessed by A&E staff, the highest number tracked since 2010.

This translates to nearly one in five patients admitted after visiting A&E waiting for an extended period.

According to Health Secretary Wes Streeting, while progress has been made, significant challenges still need to be addressed.

Streeting acknowledged that "there is much more to do" and emphasized the need to accelerate progress, but expressed optimism that the NHS is on the path to recovery.

Dr. Vicky Price, representing the Society for Acute Medicine, noted that hospitals are operating beyond safe capacity in terms of emergency care.

Dr. Price highlighted the vulnerability of patients who require admission, often elderly and frail individuals with complex needs, who are at greater risk of harm when care is delivered in corridors and hospitals exceed safe limits.

Duncan Burton, Chief Nursing Officer for England, commended the progress made in reducing wait times, achieved despite the challenges posed by strikes by resident doctors.

Burton attributed this progress to the hard work and dedication of NHS staff, describing it as a "triumph".

Although the waiting list decreased, performance against the 18-week target slightly declined, with 61.5% of patients waiting less than 18 weeks, compared to 61.8% in November, and still short of the 92% target set to be met by 2029.

Rory Deighton of the NHS Confederation, which represents hospitals, welcomed the progress but cautioned that it obscures significant regional variations.

A recent BBC report revealed that nearly a quarter of hospital trusts experienced worsening wait times over the past year.

Deighton emphasized that the NHS is composed of numerous separate organizations, each with unique financial and operational challenges, making it more difficult to address care backlogs in some areas.

According to Deighton, this means that tackling care backlogs will be more challenging in certain parts of the country due to these distinct regional challenges.

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