Science journalist Rachel Gross experienced a cerebellar bleed, affecting her ability to sing karaoke. After surgery to remove part of her cerebellum, she felt a profound change in herself, not just physical clumsiness. Intrigued, Gross investigated the cerebellum's surprising roles in cognition and identity. She discovered a new wave of neuroscience research expanding our understanding of the brain. The cerebellum, once thought only to control motor skills, plays a critical role in complex cognitive processes. Gross explores the connection between seemingly unrelated actions, like singing and reaching for a coffee cup. This research reveals the intricate interplay within the brain and how it shapes our experiences. The investigation delves into the cerebellum's involvement in both basic and higher-level functions. The episode highlights the impact of the cerebellum on our overall sense of self. The episode includes research papers and books for further exploration. Radiolab is supported by listeners and various foundations, including the Gordon and Betty Moore Foundation.