Mario Ponzo (; June 23,1882 – January 9, 1960) was an Italian academic

psychologist A psychologist is a professional who practices psychology and studies mental states, perceptual, cognitive, emotional, and social processes and behavior. Their work often involves the experimentation, observation, and interpretation of how indi ...

. He was also the Professor Emeritus of Psychology at the University of Rome as well as the Honorary President of the Italian Society of Psychology. He was born in Milan, Italy to a

Piedmont it, Piemontese , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , demographics1_title2 ...

ese family. Ponzo illusion

Academic career

He went on to study medicine at the

University of Turin The University of Turin (Italian: ''Università degli Studi di Torino'', UNITO) is a public research university in the city of Turin, in the Piedmont region of Italy. It is one of the oldest universities in Europe and continues to play an impo ...

while also studying psychology under Frederico Kiesow, receiving his degree in 1906. He was appointed docent in psychology in 1911 and worked under Kiesow for twenty-five years after his graduation, until he was asked to join the Faculty of Medicine at the University of Rome in 1931. There, he succeeded

Sante De Sanctis Sante De Sanctis (7 February 1862 – 20 February 1935) was an Italian physician, psychologist, and psychiatrist. He is considered one of the founders of the Italian psychology and pediatric psychiatry. Life Sante De Sanctis was born on 7 Feb ...

as the chair of psychology and remained in the position until his retirement in 1952. After his retirement he worked as a non-staff professor for an additional five years, and was named Professor Emeritus in 1958. He was also involved in vocational guidance while he was in Rome and founded a school at the Institute of Psychology at the University of Rome.

Research

Ponzo contributed to several Italian and non-Italian psychology journals including ''

Psychological Abstracts ''Psychological Abstracts'' was an abstract and index periodical and the print counterpart of the PsycINFO database. It was published by the American Psychological Association and was produced for 80 years, ceasing publication at the end of 2006 ...

'' and ''

Psychological Reports ''Psychological Reports'' is a bimonthly peer-reviewed academic journal covering research in psychology and psychiatry. It was established by Robert and Carol H. Ammons in 1955. The editor-in-chief is Cory Scherer (Penn State Schuylkill). It is pub ...

''. In 1911 he published an article in the journal ''Archives Italiennes de Biologie'' which deals with the Aristotle illusion, a phenomenon where a small round object touched to two crossed fingers feels like two objects. His name is associated with the so-called

Ponzo illusion The Ponzo illusion is a geometrical-optical illusion that was first demonstrated by the Italian psychologist Mario Ponzo (1882–1960) in 1911. He suggested that the human mind judges an object's size based on its background. He showed this by dr ...

, although he never claimed to have discovered this effect, which can be traced to earlier publications. He studied it, and proposed that a similar contrast effect can explain the Moon illusion: the fact that the Moon appears much larger at the horizon. For the ''Atti della Regia Accademia delle Scienze di Torino'' he wrote what has been described as the first article in Italian on the psychology of cinema. Two of his works on the topic were translated into English in 2017 as a part of a compilation of early film theories from Italy called ''The Little Magic Machine''. One of his articles on the psychology of cinema include ''Cinema and Juvenile Delinquency'' which looks at the relationship between negative behavior in young people and cinema. Another one is entitled''"About Some Psychological Observations Made during Film Screenings' which looks at the principle of motion perception during motion picture screenings.At the time of his death, he had been published approximately 280 times. Ponzo also served as a foreign associate for the American Psychological Association, as a member of the Hungarian and German Societies of Psychology, and of the International Association of Applied Psychology. Ponzo was interested in variety of fields within the larger realm of psychology including sensory and perceptual processes, imaginative and representative processes,Ponzo, Mario. "Urteilstäuschungen über Mengen." ''Archiv für die gesamte Psychologie'' (1928). personality, psychomotor processes, and applied psychology.

References

Italian psychologists Academic staff of the Sapienza University of Rome Health professionals from Turin 1882 births 1960 deaths 20th-century psychologists {{psychologist-stub