Old electrodes are shown in the film, in the flashbacks to Samara's stay in the hospital, heavily implying that electro-shock therapy was used on her. It's also possible that their purpose might have been only used for reading signals. A (failed) psychosurgery is mentioned in her medical files as well. Both were fairly common practices in her lifetime (the 1970s), possibly even more so with unusual patients such as herself.

Film

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