By Adam Osth, Senior Lecturer, The University of Melbourne YouTube With roughly half of Australia in lockdown at the moment, a common experience is a warped sense of time and poor memory. What day is it? What week is it? Did I go to the supermarket yesterday, or was it the day before? Am I actually in the movie Groundhog Day and experiencing the same day over and over? While lockdown can have a range of impacts such as anxiety and depression — both of which can impair memory — these aren’t the whole picture. There is increasing theoretical and experimental evidence that suggests both memory and time perception are based on the same underlying principle: a change in your physical and/or mental state.