The relationships between age and performance for responses to random letter stereograms were examined on three measures: response speed (RS), depth judgment (DJ) and number of errors in locating a figure. These relationships were studied as a function of two stimulus properties: matrix density (MD), defined in terms of percent of letter saturation; and column shift (SC), defined in terms of number of columns of horizontal displacement of the figure. The results supported a prediction of age differences in performance with the RS and the error data: a consistent trend was observed in which the performance of Ss in the different age groups could be ordered in terms of efficiency. Subjects in group II (mean age, 24.9 years) performed best, followed by Ss in groups I, III, IV, and V, with respective mean ages of 12.0, 42.0, 53.7, and 74.6 years. The observation, for group II at a CS of 3, of higher RS scores at an MD value of 40 than at an MD values of 100 percent and 10 percent substantiated previous results with young adult Ss. The present findings indicated the limits of generalization of these relationships over age, and for a wider range of CS values.
Proceedings of the Iowa Academy of Science
©1968 Iowa Academy of Science, Inc.
"The Relationship Between Age and Response Speed with Random Letter Stereograms,"
Proceedings of the Iowa Academy of Science, 75(1), 324-333.
Available at: https://scholarworks.uni.edu/pias/vol75/iss1/45