anxiety
Anxiety (Panic Disorders, Phobias)
Mental & Emotional Health

People with Anxiety Show Fundamental Differences in Perception

People suffering from anxiety perceive the world in a fundamentally different way than others do, according to a study done at the Weizmann Institute of Science in Israel and reported in the Cell Press journal Current Biology on March 3rd 2016. The research may help explain why certain people are more prone to anxiety.

A release from the institute report that the new study shows that people diagnosed with anxiety are less able to distinguish between a neutral, “safe” stimulus (in this case, the sound of a tone) and one that had earlier been associated with gaining or losing money. In other words, when it comes to emotionally-charged experiences, anxiety prone people show a behavioral phenomenon known as “over-generalization,” the researchers say.

The release quotes Prof. Rony Paz as saying, “We show that in patients with anxiety, emotional experience induces plasticity in brain circuits that lasts after the experience is over. Such plastic changes occur in primary circuits, and these later mediate the response to new stimuli. The result is an inability to discriminate between the experience of the original stimulus and that of a new, similar stimulus. Therefore anxiety patients respond emotionally to the new stimuli as well and exhibit anxiety symptoms even in apparently irrelevant situations. They cannot control this response: it is a perceptual inability to discriminate.” The study was a collaboration between psychiatrist Dr. David Israeli and Paz, and it was led by Dr. Offir Laufer, then a PhD student in Paz’s group.

Paz and his colleagues recruited anxiety patients to participate in the study. They trained the patients to associate three distinct tones with one of three outcomes: money loss, money gain, or no consequence. In the next phase, the participants were presented with one of several new tones and were asked whether the tone was one they had heard before while in training. If they were right, they were rewarded with money.

The best strategy would be to take care not to mistake (or over-generalize) a new tone for one they had heard in the training phase. But people with anxiety were more likely than healthy controls to think that a new tone was one they had heard earlier. That is, they were more likely to mistakenly associate a new tone with the earlier experience of money loss or gain. Those differences were not explained by differences in participants’ hearing or learning abilities. The research shows that they simply perceived sounds that were earlier linked to an emotional experience differently.

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