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A leading research centre has called for new laws to restrict the use of emotion-detecting tech. The AI Now Institute says the field is “built on markedly shaky foundations.” Despite this, systems are on sale to help vet job seekers, test criminal suspects for signs of deception, and set insurance prices. It wants such software to be banned from use in important decisions that affect people’s lives and/or determine their access to opportunities. The US-based body has found support in the UK from the founder of a company developing its own emotional-response technologies — but it cautioned that any restrictions would need to be nuanced enough not to hamper all work being done in the area.

AI Now refers to the technology by its formal name, affect recognition, in its annual report. It says the sector is undergoing a period of significant growth and could already be worth as much as $20 billion. “It claims to read, if you will, our inner-emotional states by interpreting the micro-expressions on our face, the tone of our voice or even the way that we walk,” explained co-founder Prof Kate Crawford. “It’s being used everywhere, from how do you hire the perfect employee through to assessing patient pain, through to tracking which students seem to be paying attention in class. “At the same time as these technologies are being rolled out, large numbers of studies are showing that there is… no substantial evidence that people have this consistent relationship between the emotion that you are feeling and the way that your face looks.”

A precipitous drop in the happiness, self-esteem and life satisfaction of American teenagers came as their ownership of smartphones rocketed from zero to 73 percent and they devoted an increasing share of their time online. Coincidence? New research suggests it is not. In a study published Monday in the journal Emotion, psychologists from San Diego State University and the University of Georgia used data on mood and media culled from roughly 1.1 million U.S. teens to figure out why a decades-long rise in happiness and satisfaction among U.S. teenagers suddenly shifted course in 2012 and declined sharply over the next four years.

In the new study, researchers tried to find it by plumbing a trove of eighth-, 10th- and 12th-graders’ responses to queries on how they felt about life and how they used their time. They found that between 1991 and 2016, adolescents who spent more time on electronic communication and screens — social media, texting, electronic games, the internet — were less happy, less satisfied with their lives and had lower self-esteem. TV watching, which declined over the nearly two decades they examined, was similarly linked to lower psychological well-being.

By contrast, adolescents who spent more time on non-screen activities had higher psychological well-being. They tended to profess greater happiness, higher self-esteem and more satisfaction with their lives. While these patterns emerged in the group as a whole, they were particularly clear among eighth- and 10th-graders, the authors found: “Every non-screen activity was correlated with greater happiness, and every screen activity was correlated with less happiness.”