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Marbe, K. and W. Peters (eds.). Advances in Psychology and Its Applications. 5 volumes in 3 parts. (= complete set). Leipzig and Berlin, Teubner 1913–1922. Large 8°. Contemporary half-leather binding (some wear). Among the contributions: “Initial Training of the Elberfeld Horses” by R. Sommer. The Elberfeld horses were dressage horses in Elberfeld (now Wuppertal) at the beginning of the 20th century, which became world-famous for their alleged ability to calculate and think. Initiated by Karl Krall, Arabian stallions such as Muhamed and Zarif demonstrated abilities such as root extraction, reading, and playing music. However, these feats were likely based on the "Clever Hans effect," in which horses interpret unconscious signals from humans. - St.a.T. Vol. 5, partly slightly browned due to the paper.
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