Prince Harry, whose mother Princess Diana died violently and suddenly when he was 12 years old, has in the last several years shared intimately about the mental health impacts of his trauma and how therapy helped him address his suffering. In his new Apple TV+ docuseries on mental health with Oprah Winfrey airing Friday, Harry shares his experience with a specific therapy he found especially effective: EMDR.

Eye movement desensitization and reprocessing (EMDR) was developed by psychologist Francine Shapiro in the 1980s to help people alleviate distress around painful memories. The therapy has been used by clinicians for decades, but has become an increasingly popular and sought-after treatment to deal with traumatic or adverse life experiences.

In the docuseries, Harry shows viewers the experience of using EMDR to address the discomfort he feels when he flies into London, which he said reminds him of the loss of his mother. Harry says he feels nervous, tense and hollowed out. He thinks of being "hunted," "helpless" and as though "there is no escape."