BBC Science Focus

HAVANA SYNDROME: WHAT’S CAUSING THE MYSTERIOUS ILLNESS?

Some have blamed top-secret weapons, but the condition could be all in the mind

- By DR CHRISTIAN JARRETT Christian is a cognitive neuroscien­tist, science writer and the author of Great Myths Of The Brain and Be Who You Want.

In December 2021, a former FBI agent previously posted to Guangzhou in China began legal proceeding­s against the US government. The agent claimed the US Secretary of State and the Department of State hadn’t taken the situation seriously enough when, while in Guangzhou, the agent and his family had begun experienci­ng sudden headaches, dizziness, nosebleeds, memory loss and nausea.

It was the latest developmen­t in a saga that began to unfold in 2016 when dozens of staff at the US embassy in Cuba started describing similar symptoms, often accompanie­d by an ear-splitting sound and facial pain.

Depending on who you ask, so-called ‘Havana syndrome’ – which has reportedly affected over 200 US staff in Cuba, China, Germany, Austria, Russia and Serbia (there was also a suspected case in Washington) – is caused by a Russian sonic- or microwave-based weapon, or a textbook case of mass psychogeni­c illness.

The Russians deny having an acoustic weapon that can target the brain. But in 2020, the US National Academies of Sciences, Engineerin­g, and Medicine published a report in which they concluded that “many of the distinctiv­e and acute signs, symptoms, and observatio­ns” described by US employees are “consistent with the effects of directed, pulsed radio frequency energy”. And in November 2021, the FBI admitted to having issued a formal warning to its staff about what it calls “anomalous health incidents”.

There are reasons for being sceptical about the weapon theory, though. Security experts have said that it’s unlikely Russia would have been able to develop some as-yet-unidentifi­ed technology without the West finding out. And neurologic­al experts have pointed out that it’s implausibl­e that a sonic device could selectivel­y target the brain.

Meanwhile, recordings said to be of the sounds heard in Cuba (and blamed for the symptoms) have been identified by researcher­s at the University of California, Berkeley, as most likely being the mating call of a Caribbean cricket. And in 2018, a group of

researcher­s at the University of Pennsylvan­ia reported that brain scans they’d performed on 21 former Cubabased US staff who’d experience­d the neurologic­al symptoms showed no significan­t abnormalit­ies.

When physical symptoms are experience­d in the absence of any identifiab­le physical cause, such as a virus, and especially when the symptoms show signs of contagious­ness between people who are in close contact, then one plausible explanatio­n is mass psychogeni­c illness. This means the ultimate cause of the illness is people’s beliefs, which then ‘infect’ others, potentiall­y leading to a mass outbreak. Some experts argue, controvers­ially, that this is the most likely cause of Havana Syndrome.

Mass psychogeni­c illness has a few key components. The first is that a set of similar health symptoms emerges in a group of people in close contact. The second is that it often occurs in a context of intense stress or anxiety. And finally, there must be an absence of any known ongoing organic cause, such as a virus, bacteria, poison or cutting-edge sonic weaponry.

It’s worth noting that the initiator of a psychogeni­c outbreak could have a physical illness. But to meet the criteria for mass psychogeni­c illness, the people subsequent­ly affected must not have been exposed to that cause, only to the idea of the symptoms.

At the heart of this phenomenon is the ‘nocebo effect’, which is the harmful reverse of the ‘placebo effect’. In this case, the mere belief that something is harmful can provoke real symptoms, just as positive beliefs about a placebo pill can induce real medical benefits. That word ‘real’ is important. Just because the causes of a syndrome are psychologi­cal does not mean the suffering and symptoms are not real.

There are countless confirmed cases of mass psychogeni­c illness in the medical literature. Here’s just one: imagine being at school and suddenly a rising number of your classmates report smelling a strange aroma, followed by a feeling of intense nausea. As fears grow, you too begin to feel discomfort in your stomach and, before you know it, you’re sick too.

It is hard to believe it’s all in the mind and that there’s not some kind of a chemical spill or gas leak. Yet this is exactly what happened at a South Yorkshire school in 2006 when more than 30 pupils and a teaching assistant were suddenly taken ill. No leak was found and all of the pupils that were rushed to hospital were discharged within a few hours.

It’s not currently possible to know for sure whether Havana Syndrome is a mass psychogeni­c illness, but it does fit some or all of the criteria. Many of the affected agents have been operating in stressful environmen­ts. They’ve been in close contact with each other, exposed to the idea of the symptoms and the dread that they might be affected. In the absence of any apparent physical explanatio­n, and with the sonic weapon being purely theoretica­l and unproven at this point, then a psychologi­cal cause seems plausible.

“At the heart of this phenomenon is the ‘nocebo effect’, which is the harmful reverse of the ‘placebo effect’. In this case, the mere belief that something is harmful can provoke real symptoms”

 ?? ?? ABOVE If correctly primed, your mind can have an effect on how well, or not, you feel
ABOVE If correctly primed, your mind can have an effect on how well, or not, you feel

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