by any other procedure. Describing phenomena presupposes the existence of an already established field of research. Phenomenologists have discovered a wealth of information in their tradition of study (Thines, 1977, pp. 130-133).
The field of phenomenological experimental psychology has discovered many facts. Physiologists who used critical self-observation such as Purkinje and Helmholtz made many advances regarding visual phenomena. Hering is another example of relying on descriptive observations to offer information on the sensory processes. Stumpf, an experimental psychologist, used phenomenological methods to study acoustics and the psychology of music. He practiced as a scientist studying specific perceptual phenomena from the point of view of the listener, with attention to the corresponding physical and physiological aspects of hearing. Katz used description to study color and touch; he considered subjective phenomena in relation to capacities of the corresponding receptors within the
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