Whether they’re triggered by looking through old family photographs, hearing a piece of music you haven’t heard for years or eating a favourite childhood snack, feelings of nostalgia often come flooding into our hearts and minds.

But what is going on in our brains when we have these feelings?

In this episode I catch up with writer and historian Dr Agnes Arnold-Forster a writer, author of the new book Nostalgia: A History of a Dangerous Emotion.

She tells us how this intriguing emotion has gone from being thought of as a deadly disease to being used as a therapy to treat degenerative cognitive conditions.
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