Have you ever walked into a room and then wondered why you went there?

If you’ve experienced this phenomenon, you’ve had a prospective memory lapse.

Memory usually means remembering things that have already happened. But prospective memory is the ability to remember to do something in the future – such as stopping to get milk on the way home from work, calling your mom on her birthday or remembering to take your casserole out of the oven. Sometimes, errors lead to heartbreaking results – such as forgetting to take your toddler out of the car on a hot day.

I am a clinical neuropsychologist and a professor of psychology and neuroscience. For the past 30 years, my research has focused on this phenomenon, measuring prospective memory and looking for treatments to help those having problems.

A failure of prospective memory can lead a parent to leave a child in a hot car.