Ludwik Fleck and the Thought Collective

The city of Lviv where Ludwik Fleck was born and completed his medical degree

The city of Lviv where Ludwik Fleck was born and completed his medical degree Image: Petar Milošević

On July 11, 1898Polish and Israeli physician Ludwik Fleck was born. Fleck did important work in epidemic typhus in Lwów, Poland, with Rudolf Weigl and in the 1930s developed the concepts of the “Denkstil” (“thought style”) and the “Denkkollektiv” (“thought collective”). The concept of the “thought collective” defined by him is important in the philosophy of science and in logology (the “science of science”), helping to explain how scientific ideas change over time.

Ludwik Fleck enrolled at Lviv University where he received his medical degree. He started working as Rudolf Weigl’s assistant and worked in the department of internal medicine at Lwów General Hospital. Later on, Fleck became director of the bacteriological laboratory at the local social security authority. Starting from 1935, Ludwik Fleck started working at the previously founded bacteriological laboratory.

In 1942, Fleck and his family were deported to the Laokoon pharmaceutical factory to produce a typhus serum since he was known to the German occupiers. They were later sent to the Auschwitz concentration camp where Fleck was to diagnose syphilis, typhus and other illnesses using serological tests. In December 1943 and until the liberation of Poland in 1945, Fleck was detained at Buchenwald concentration camp.

After the war, Fleck served as head of the Institute of Microbiology of the School of Medicine of Maria Sklodowska-Curie University of Lublin and after that he moved to Warsaw to become the Director of the Department of Microbiology and Immunology at the Mother and Child State Institute.

Ludwik Fleck became known for his concept of the thought collective. It is defined as a community of researchers who interact collectively towards the production or elaboration of knowledge using a shared framework of cultural customs and knowledge acquisition. Fleck identified the scientific production of knowledge as primarily a social process that hinges upon prior discoveries and practices in a way that constrains and preconditions new ideas and concepts in his work ‘Entstehung und Entwicklung einer wissenschaftlichen Tatsache; Einführung in die Lehre vom Denkstil und Denkkollektiv’. In it, Fleck describes a ‘truth’ as a relative value, expressed in the language or symbolism of the thought collective in which it belonged, and subject to the social and temporal structure of this collective. This means that a specific truth is true or false is impossible. It is true in its own collective, but incomprehensible or unverifiable in most others. Fleck came to the conclusion that new scientific insights can not only be developed by accumulating new pieces of information, but also in overthrowing the old ones. Change was especially possible when members of two thought collectives met and cooperated in observing, formulating hypothesis and ideas.

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