'In his 1922 reference to psychological time as the only alternative to his own physical time, Einstein appealed not then to a field in which contentions regarding the nature of mind could directly inform studies of the nature of bodies, but rather to an increasingly laboratory-based discipline that addressed questions that at least nominally fell outside of the purview of physiological research. It is significant in this respect that he had since at least 1916 cultivated a close relationship with one of the pioneers of experimental psychology in Germany, Max Wertheimer. In 1922 Einstein asked Wertheimer to deputise for him at the League of Nations' Committee on Intellectual Cooperation, over which Bergson presided. In the same year, in the first of a number of such letters, he also penned a recommendation for him (to Moritz Schlick at Kiel) on the basis of both his personal acquaintance and his psychological expertise. [note: 'M. Wertheimer to A. Einstein, 17th Sept. 1922 and A. Einstein-M. Schlick, 28th Apr. 1922, trans. in Luchins and Luchins 1979, 173-174 and 181. Einstein and Bergson's League of Nations experiences (though not Einstein's invitation to Wertheimer) are related in Canales 2015, 114-130.']'