She was also interested in the methods of the time, such as phrenology (a pseudoscience that relied on measuring bumps on the skull to predict mental characteristics) and mesmerism (an 18th-century proto-scientific theory that postulated the existence of an invisible natural force possessed by all living things, including humans).
In 1844, she wanted to create a mathematical model of how the brain causes thoughts and the nerves cause feelings ("Calculus of the Nervous System"). She never realized it. The reason for Lovelace's interest in the brain was that she had long been preoccupied with her potential insanity, which she had inherited from her mother. As part of her work on this project, she contacted electrical engineer Andrew Crosse to learn how to conduct electrical experiments.
She also worked on projects exploring the relationship between mathematics and music.
