Differential psychomotor skills in a clinical group

Schoppe's Motoric Performance Series (MLS) was administered to a group of psychiatric patients. Three factors emerged after principal component analysis with varimax rotation, the first two of which represented about 60% of the total variance and corresponded to a speed and precision factor. Zonal analysis revealed that MLS profiles of high and low trait neurotic patients were not significantly different from each other. Extraverts were inclined to exhibit inferior performance compared to introverts as witnessed by elevated scores on the subtests associated with lack of precision (steadiness and line-tracing error rates, steadiness error duration, as well as insertion of small pins). Introverted and extraverted neurotics did not differ significantly in MLS components.High and low P Ss displayed similar MLS profiles with the exception of the subtest, line-tracing (duration), in which high trait P individuals tended to perform faster. The dissimulating group (L +) required significantly longer to complete the two pin insertion tasks (both loaded on the speed factor) indicating inferior hand- and finger-dexterity, compared to low L-scoring patients. Several interactions, P × L, emerged as statistically significant. P − were less precise (steadiness error time), and required considerably less time to execute the line-tracing task, than P + Ss, for high L-scoring individuals only. P − L − individuals yielded the lowest tremor scores of all four groups.