The masks worn by teachers during the Covid-19 pandemic has caused difficulty in learning to read for pupils who find it hard to discriminate language sounds. This has been proved by researchers from the Loria (Lorraine Research Laboratory in Computer Science and its Applications; Université de Lorraine-Inria-CNRS), the Laboratory of Cognitive Psychology (Aix-Marseille University-CNRS) and the University of Geneva. They carried out a study on pupils aged 5 to 7 years which was published on May 12th in electronic format and June 9th in the print journal L’année psychologique/Topics in Cognitive Psychology.