Movement cue reproduction under preselection

A series of three experiments was undertaken to determine the role of prior knowledge of different movement cues in the preselection effect. Experiments 1 and 2 examined the singular and combinative role of location and extent cues under both preselected and constrained conditions. The third experiment provided a framework for evaluating the sources of informations which may contribute to the preselection phenomenon. In experiments 1 an 2, the results suggest the advantage of preseleted over constrained movement was constant across movement cues. The second experiment demonstrated that the dual cue condition was superior to location alone and extent alone in both accuracy and consistency. Finally, the third experiment indicated that prior knowledge (strategy) was the primary variable responsible for the preselection effect.     

Temperature-induced changes in neuromuscular function: central and peripheral mechanisms

Three series of experimental tests were conducted on subjects under both elevated and depressed thermal conditions. Tripartite series consisted of whole-body immersion excepting the head, whole-body immersion excepting the head and response limb, and immersion of the discrete-response limb. Measures of physiological and behavioural responses were made at sequential .4 degrees C changes during whole-body immersions and approximately 5 degrees C changes of water temperature during the immersion of a limb only. Results suggested that velocity of nerve conduction decreased with thermal depression. Premotor, motor, simple, and choice reaction times varied differentially as a function of the hot and cold conditions. Implications of these differential effects on neuromuscular function are examined with respect to person-machine performance in artificially induced or naturally occurring extremes of ambient temperature.