The Defense Mechanism Test predicts inadequate performance under stress

Abstract

Perceptual defense reactions as tested by the Defense Mechanism Test (DMT) correlated to specific performance criteria in parachutists and divers. In the parachute study ( N =34), 8 trainees were identified on the Reaction Formation variable of the DMT, and 6 were among the Ss ( N =8) who failed the performance test (χ 2 =15.14, phi =0.67, p <0.001). In the diver study ( N =45), performance was impaired by the nitrogen narcosis produced by the high partial pressure of nitrogen. Memory was significant reduced both when recall and learning were done under narcosis ( t (44)=4.08, p <0.01, and t (44)=4.90, p <0.01). The reduction on reasoning capacity proved insignificant, but using the median reduction as cut score, the Reaction Formation variable correlated significantly with the reduction (χ 2 =6.51, phi =0.39, p <0.02). Memory and learning effect/reasoning tests did not correlate to any of the DMT variables using the median as a cut score. Using the Taylor Manifest Anxiety Test (TMAS) as a moderator variable, a significant correlation between reduction on the reasoning test and the combined score high anxiety/high defense was obtained (χ 2 =15.23, phi = 0.83, p <0.001).