[1] Thus, when her mentor, the psychologist Matsumoto Matataro, encouraged her to pursue further education, she left Japan for the United States after graduating in 1906.

[3] The two arrived in Vancouver, Canada after twelve days of traveling, and then parted ways, with Haraguchi heading towards New York.

[2] She focused on experimental psychology and pedagogy, and was taught by Edward Thorndike, Robert S. Woodworth and James McKeen Cattell.

[6] In Experiment 1, she mentally multiplied four-digit numbers for up to eleven hours straight for several days, only pausing to record how long each problem took to complete and to eat.

Her 26 subjects carried out numerous tasks, consisting of: memorising nonsense monosyllables; adding columns of one-digit numbers; association work; and mental multiplication.

After five years of research, Haraguchi earned her doctorate on 5 June 1912, becoming the first Japanese woman to attain a PhD in any field.

[7] Much of Haraguchi's memoirs were allotted to explaining Japanese readership of Taishō Japan North American life and customs.

[2] A record of her experiences at Columbia University and her observations of cultural differences between Japan and the U.S., Happy Memories, was also published in 1915.