If you’ve made a resolution to spend less time on your phone this year, help is at hand. The Guardian has launched a new newsletter, Reclaim your brain. Its co-writer and expert coach Catherine Price tells Madeleine Finlay how her own excessive phone use inspired her to investigate the science behind our relationships with our devices, and what we know about how to break the cycle. And Prof Barbara Sahakian of Cambridge University explains why many of us are drawn to looking at bad news on our phones, and what it’s doing to us