Peter Swales (2003) investigated the historical data and states that Freud probably visited an exposition of Italian masters in Bergamo mid-September 1898, showing paintings of Signorelli, Botticelli and Boltraffio one next to the other. In his view the paintings at the exposition were the source of the substitute names in the parapraxis. Swales dwells largely on the three paintings. The association of the name Boltraffio to the name Da Vinci, another hypothesis formulated by Swales (because Freud might have seen the statue of Boltraffio at the bottom of the Da Vinci monument on Piazza della Scala in Milan some days before his visit to Bergamo), is not further pursued by Swales. Although Freud visited Trafoi on the 8th of August 1898, Swales doubts whether Freud received a message on the suicide of one of his patients.
Read more about this topic: Signorelli Parapraxis