Mammals including humans are more likely to suffer from short-term memory loss during the winter, a new study suggests. Experts at the University of Bradford looked at how rats performed in memory tests when exposed to long and short'photoperiods', or periods of exposure to light. They found a'significant' link between poor memory and short day length, akin to what humans experience during the winter season. It's possible that the results could be applicable to humans, the team say, suggesting we're more prone to forgetfulness during long winters. Short-term memory loss refers to forgetting things that occurred recently, such as conversations or events.