Ach, Narciss (German: Ach, 1871–1946) was a German psychologist whose work was associated with the fields of perception psychology and psychophysiology. His research addressed issues of the organization of perception and attention, as well as the influence of psychophysiological processes on perception. Narciss made a contribution to the study of various aspects of sensory perception and attention, which played an important role in the development of psychology.
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