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As part of an ongoing investigation of relationships between perceptual mode and physiological reactivity, 92 randomly chosen male college freshmen (age range 17 to 25) were tested for field-independence-dependence on the rod-and-frame test (Witkin, 1954) and assessed physiologically in response to such stressors as the cold pressor, a test dose of mecholyl, and a test dose of adrenaline. Many Ss whose rod-and-frame scores had been determined as entering freshmen were still completing their physiological testing during their junior and senior years. It, therefore, became important to find out how stable a measure the rod-and-frame score was for a given individual over time. The undergraduate period is an eventful one, productive of many crucial changes in the lives of young adults, and this in itself might militate against the stability of rod-and-frame scores obtained at the start of the freshman year. Therefore, a random group of 50 Ss from the original 92 were contacted for rod-andframe testing approximately 4 yr, after their first testing. For 36 of the 50 Ss test and retest data were available on the standard t 28 deviations were used throughout (Adevai, et al., 1968). There was no significant difference between the mean error score in 1964 (n = 36, 4.66) and that in 1968 (4.41). The product-moment correlation between the two sets of scores was .86 ( p < ,001). Of those 11 people in the group of 36 who had been classified in 1964 as extreme scorers (average error less than 2.0 or greater than 7.9), only one S moved out of his original group (first testing, 1.9; second testing, 7 ) . N o reason for the change seemed clear. These findings agree closely with those of Bauman (1951) who obtained a correlation of .84 between test and re-test scores, 3 yr. apart, for 32 males. The results indicate that the trait (field-dependence) measured by the rod-and-frame is stable over time and that the rod-and-frame performance is reliable.
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