Über einige periodische vorgänge in der figuralwahrnehmung

The fact that periodic fluctuations in perception are observed under certain boundary conditions e.g. appearance and disappearance of contours in the threshold domain (so called fluctuations of attention) or the permanent reversals of the figure-ground relation in ambiguous figures (inversion figures) gave rise to the equation whether such periodic-rhythmic behaviour may also be proved for simple figures during prolonged observation. Ten subjects were presented circles and squares in the left half of the visual field for 200 sec, on the right side the corresponding figures were shown for comparison in intervals of 2,5 sec. Statistically secured periodic fluctuations of magnitude with amplitude between 3 and 9% of the actual figure size were obtained. By serial correlation the mean oscillation periods were established between 7,5 and 12,5 sec, a value that corresponds to a large degree to those found with inversion figures and attention fluctuations. The periodic fluctuations of attention are brought into connection with macrorhythmical potential fluctuations in the EEG.

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