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Some of our biggest achievements happen in the first years of our lives. Taking our first steps, picking up a complex language from scratch, and forming relationships with some of the most important people we鈥檒l ever meet. But when we try to remember this period of great change, we often draw a blank.

After losing his Dad aged four, CrowdScience listener Colin has grappled with this. Why can鈥檛 he recall memories of such a monumental figure in his life, yet superficial relationships from his teens remain crystal clear in his mind? Colin takes presenter Marnie Chesterton to visit some of the significant locations of his childhood, places he would have spent many hours with his late father; and he recounts his earliest memories.

On this trip down memory lane, Marnie discovers the psychological reason behind our lack of early childhood memories comes down to a phenomenon known as infantile amnesia. Tom谩s Ryan, neuroscientist at Trinity College Dublin, discusses some of the theories behind this universal experience, and Sarah Power from the Max Planck Institute for Human Development discusses her groundbreaking study exploring this form of forgetting in real time. Elaine Reese from the University of Otago digs into how our environment and culture can influence the age of our earliest memories, and why some of the first things we remember might not be the big, huge events you鈥檇 expect. And we hear about fascinating new insights from animal studies that hint these memories could still be lurking inside our heads...

Presenter: Marnie Chesterton
Producer: Julia Ravey
Content Editor: Cathy Edwards
Production Co-ordinators: Ishmael Soriano & Josie Hardy
Technical producer: Emma Harth

(Photo: Marnie Chesterton and CrowdScience listener, Colin, on the swings in Belfast.)