It’s not often that a new evidence-based psychological treatment comes around, but a few 15-minutes sessions of cognitive-bias modification (CBM) may be enough to treat anxiety and other ailments:
CBM is based on the idea that many psychological problems are caused by automatic, unconscious biases in thinking. People suffering from anxiety, for instance, may have what is known as an attentional bias towards threats: they are drawn irresistibly to things they perceive to be dangerous. Similar biases may affect memory and the interpretation of events. For example, if an acquaintance walks past without saying hello, it might mean either that he has ignored you or that he has not seen you. The anxious, according to the theory behind CBM, have a bias towards assuming the former and reacting accordingly.
The goal of CBM is to alter such biases, and doing so has proved surprisingly easy. A common way of debiasing attention is to show someone two words or pictures — one neutral and the other threatening — on a computer screen. In the case of social anxiety these might be a neutral face and a disgusted face. Presented with this choice, an anxious person instinctively focuses on the disgusted visage. The program, however, prods him to complete tasks involving the neutral picture, such as identifying letters that appear in its place on the screen. Repeating the procedure around a thousand times, over a total of two hours, changes the user’s tendency to focus on the anxious face. That change is then carried into the wider world.
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In a recent study of social anxiety by Norman Schmidt of Florida State University and his colleagues, which involved 36 volunteers who had been diagnosed with anxiety, half underwent eight short sessions of CBM and the rest were put in a control group and had no treatment. At the end of the study, a majority of the CBM volunteers no longer seemed anxious, whereas in the control group only 11% had shed their anxiety. Although it was only a small trial, these results compare favourably with those of existing treatments. An examination of standard talk therapy carried out in 2004, for instance, found that half of patients had a clinically significant reduction in symptoms. Trials of medications have similar success rates.The latest research, which is on a larger scale and is due to be published this month in Psychological Science, tackles alcohol addiction. Past work has shown that many addicts have an approach bias for alcohol — in other words, they experience a physical pull towards it. (Arachnophobia, a form of this bias that is familiar to many people, works in the opposite way: if they encounter a spider, they recoil.)
This study, conducted by Reinout Wiers of the University of Amsterdam and his colleagues, attempted to correct the approach bias to alcohol with CBM. The 214 participants received either a standard addiction treatment — a form of talk therapy — or the standard treatment plus four 15-minute sessions of CBM. In the first group, 41% of participants were abstinent a year later; in the second, 54%. That is not a cure for alcoholism, but it is a significant improvement on talk therapy alone.