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We all want to be alone from time to time, to escape the demands of our colleagues or the hassle of crowds. But not alone alone. For most people, prolonged social isolation is all bad, particularly mentally. We know this not only from reports by people like Shourd who have experienced it first-hand, but also from psychological experiments on the effects of isolation and sensory deprivation, some of which had to be called off due to the extreme and bizarre reactions of those involved. Why does the mind unravel so spectacularly when we’re truly on our own, and is there any way to stop it?
We’ve known for a while that isolation is physically bad for us. Chronically lonely people have higher blood pressure, are more vulnerable to infection, and are also more likely to develop Alzheimer’s disease and dementia. Loneliness also interferes with a whole range of everyday functioning, such as sleep patterns, attention and logical and verbal reasoning. The mechanisms behind these effects are still unclear, though what is known is that social isolation unleashes an extreme immune response – a cascade of stress hormones and inflammation. This may have been appropriate in our early ancestors, when being isolated from the group carried big physical risks, but for us the outcome is mostly harmful.
Yet some of the most profound effects of loneliness are on the mind. For starters, isolation messes with our sense of time. One of the strangest effects is the ‘time-shifting’ reported by those who have spent long periods living underground without daylight. In 1961, French geologist Michel Siffre led a two-week expedition to study an underground glacier beneath the French Alps and ended up staying two months, fascinated by how the darkness affected human biology. He decided to abandon his watch and “live like an animal”. While conducting tests with his team on the surface, they discovered it took him five minutes to count to what he thought was 120 seconds.
A similar pattern of ‘slowing time’ was reported by Maurizio Montalbini, a sociologist and caving enthusiast. In 1993, Montalbini spent 366 days in an underground cavern near Pesaro in Italy that had been designed with Nasa to simulate space missions, breaking his own world record for time spent underground. When he emerged, he was convinced only 219 days had passed. His sleep-wake cycles had almost doubled in length. Since then, researchers have found that in darkness most people eventually adjust to a 48-hour cycle: 36 hours of activity followed by 12 hours of sleep. The reasons are still unclear. But these experiences were nothing compared with the extreme reactions seen in notorious sensory deprivation experiments in the mid-20th Century. The most extensive took place at McGill University Medical Center in Montreal, led by the psychologist Donald Hebb. The McGill researchers invited paid volunteers – mainly college students – to spend days or weeks by themselves in sound-proof cubicles, deprived of meaningful human contact. Their aim was to reduce perceptual stimulation to a minimum, to see how their subjects would behave when almost nothing was happening. After only a few hours, the students became acutely restless. They started to crave stimulation, talking, singing or reciting poetry to themselves to break the monotony. Later, many of them became anxious or highly emotional. Their mental performance suffered too, struggling with arithmetic and word association tests. But the most alarming effects were the hallucinations.
The researchers had hoped to observe their subjects over several weeks, but the trial was cut short because they became too distressed to carry on. Few lasted beyond two days, and none as long as a week. Afterwards, Hebb wrote in the journal American Psychologist that the results were “very unsettling to us”. We derive meaning from our emotional states largely through contact with others. Biologists believe that human emotions evolved because they aided co-operation among our early ancestors who benefited from living in groups. Their primary function is social. With no one to mediate our feelings of fear, anger, anxiety and sadness and help us determine their appropriateness, before long they deliver us a distorted sense of self, a perceptual fracturing or a profound irrationality. It seems that left too much to ourselves, the very system that regulates our social living can overwhelm us.


Read the text and answer the questions.
1-Which physical and mental symptoms do people suffer when they are completely isolated from others?
2-What happened to Michel Siffre’s and Maurizio Montalbini’s sense of time, and why?
3-Why did Donald Hebb abandon his experiment?
4-Explain why humans suffer so much when they are completely isolated (see the last paragraph of the text).