The Society for Gestalt Theory and its Applications (GTA) is an international scientific association established for the purpose of promoting the Gestalt theoretical perspective in research and practice.

The 21th international scientific GTA conference has been held in Warsaw (Poland) in 2019 (Program click here!). The 22th GTA conference will be organized in Trieste, Italy, in 2021.


Trieste Symposium on Perception and Cognition - 27th Kanizsa Lecture

University of Trieste, November 8, 2019
starting at 9.00 am.

Traditionally, the Symposium is open to all perspectives and approaches, has no registration fee, and runs on an informal, relaxed pace.
This year the Kanizsa Lecture will be delivered by prof. Roberto Casati (Institut Jean Nicod, CNRS, France, Paris) on Friday 8 November, starting at 4.00 pm.

Shadows in vision

Roberto Casati

(Director  of the Institut Jean Nicod, Paris)

"Renaissance painters knew perspective, and mastered chiaroscuro. Cast shadows are chiaroscuro in perspective, so why did it take them a century to master the depiction of cast shadows? (Leonardo's Treatise is a fascinating compilation of strategic errors that block the solution.) Although Gestalt psychologists were keen on phenomenal objects, they nevertheless overlooked cast shadows and missed out on the rules presiding their parsing in the visual scene. (I won't even dare mention philosophers, who had shadows under their lens since Plato and could have made a lot of their representational properties. They didn't.) 
Building on common work with Patrick Cavanagh (The visual world of shadows, MIT Press 2019) I will present a view of the computational rules that govern shadow perception, from shadow labeling to ownership to the reconstruction of visual layout. I'll focus in particular on ownership, an interesting case study for the application of gestalt rules across categories of objects. I hope to convey the great heuristic power of shadows for vision science. Shadows may have been neglected or misinterpreted by psychologists, painters and philosophers, but they surely have not been slighted by the visual system, that has been able, in its long evolutionary history, to turn the noise they create into robust knowledge."
Besides the KL the Symposium will include workshops and talks on Friday, as well as a poster session during/after lunch.
If you wish to contribute a presentation, please submit your proposal by electronic mail to trieste.symposium@gmail.com (specifying whether you prefer a talk or poster). Each proposal should be submitted as an abstract (250-400 words). Proposal will be evaluated by a scientific committee.
More information about the program will be available on the website:


In 2017 the GTA held its 20th international scientific Gestalt conference in Vienna, Austria:

April 27th – 29th, 2017

Individual and Group

Dynamic Interdependency within Social Situations

Invitation and Conference Information

Wien Stephansplatz

Vienna, Stephans Cathedral


In May 2015 the GTA held its 19th international Gestalt theory conference in Parma, Italy, hosted by and in cooperation with the Dipartimento di Antichistica, Lingue, Educazione, Filosofia (ALEF) (Department of Classics, Modern Languages, Education and Philosophy) of the University of Parma, the Dipartimento di Neuroscienze (Department of Neuroscience) of the University of Parma and the Dipartimento di Scienze della Vita (Life Sciences Department) of the University of Trieste.

The conference theme was: Body, Mind, Expression
* Click here for the conference page *
Contact: gta2015@gestalttheory.net