Department of Psychology, University of Bremen, Bremen, Germany.
Department of Psychology, University of Tübingen, Tübingen, Germany.
Hum Mov Sci. 2022 Jun;83:102939. doi: 10.1016/j.humov.2022.102939. Epub 2022 Mar 18.
Performing coordinated bimanual movements, that is, movements with two hands simultaneously, is a requirement in many activities. At the same time, these movements are subject to temporal and spatial constraints. Here, we focus on the constraints that become observable when pointing movements of different (asymmetric) rather than same (symmetric) amplitudes have to be executed ("spatial interference effect"). The respective performance costs are larger when the stimuli used to indicate the movement targets are symbolic compared with when the endpoints of the movements are cued directly. Previous studies have thus concluded that the source of spatial interference is both 'cognitive' and 'motoric', or more precisely occurs during response selection as well as motor programming. We here asked whether the contribution from motor programming is motoric in the sense as envisaged in dual-task models, that is, whether it can run in parallel to, and interference-free with, other processing stages. In two PRP experiments, Task 1 was bimanual pointing and Task 2 was auditory pitch-discrimination. Based on the effect propagation-logic, the results suggest that the motor programming contribution to bimanual interference also taps into capacity-limited resources and cannot be construed as running in parallel as assumed for the motor stage in dual-task models.
执行协调的双手运动，即双手同时运动，是许多活动的要求。同时，这些运动受到时间和空间的限制。在这里，我们关注的是当必须执行不同（不对称）而不是相同（对称）幅度的指向运动时变得可见的限制（“空间干扰效应”）。当用于指示运动目标的刺激是符号时，与直接提示运动端点时相比，各自的性能成本更大。因此，先前的研究得出结论，空间干扰的来源既是“认知的”又是“运动的”，或者更准确地说，它发生在反应选择和运动编程期间。我们在这里询问运动编程的贡献是否是双任务模型中所设想的运动意义上的，即它是否可以与其他处理阶段并行运行且没有干扰。在两个 PRP 实验中，任务 1 是双手指向，任务 2 是听觉音高辨别。基于效应传播逻辑，结果表明，双手干扰的运动编程贡献也利用了容量有限的资源，不能像双任务模型中运动阶段那样被解释为并行运行。
