 She concentrated later on learning about altered states of consciousness, psychology, physiology and, later, neuroscience.Feilding had her first psychedelic experience at 22 years of age, when an acquaintance spiked her coffee with a massive dose of then-legal LSD.The experience nearly broke her, and she retreated to her family home for months to recover

Feilding gained notoriety in 1970 when she performed trepanation on herself, with a dental drill.