Horizontal pursuit right-arm movements and dual-task interferences: a replication and extension.
Twenty right-handed males had to follow a target moving horizontally with a velocity of 40 degrees/s either rightwards or leftwards by moving their right arm. During this pursuit tracking movement, subjects had to perform one of three different interference tasks (concurrent speaking, concurrent verbal rehearsal and concurrent visualization of a maze problem). In addition, they were required to accomplish these movements without an interference task. It was shown that while subjects spoke, pursuit movements rightwards were more inaccurate than movements leftwards. The other interference tasks did not generate such a direction specific effect. This result is in line with theories implying that visually guided right-arm movements rightwards are controlled by a neural network located in the left hemisphere, whereas right-arm movements leftwards are controlled by a neural network distributed over both hemispheres.
Jäncke
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Institute of General Psychology, Section of Cybernetical Psychology and Psychobiology, Heinrich-Heine-University, Düsseldorf.
D000328:Adult; D001132:Arm / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D011340:Problem Solving; D011597:Psychomotor Performance / Q000502:physiology*; D013060:Speech