Henri
Piéron

College de France






Michel
Imbert

University of Paris




Carl
Stumpf

Universität Berlin


Oswald
Külpe

University of Wurzburg


Friedrich
Schumann

Goethe-Universität Frankfurt (PsychTree)


Max
Wertheimer

New School for Social Research




Lothar
Spillmann

University of Freiburg

Birgitta
Dresp-Langley

CNRS France
(Options)


Tzvetomir
Tzvetanov

German Primate Center

Birgitta Dresp-LangleyX