The effects of concurrently presented visual traces of hand movements on timing, smoothness, and spatial accuracy were investigated during a loop-drawing tracking task. Thirty-five healthy young right-handed adults used a stylus on a digitizing tablet to track a left-to-right loop-drawing animation presented on a computer monitor. A dot target moved over a template of twelve connected cursive letter e's, leaving a track as it drew over each loop in the series. Participants were instructed to draw along with the target to reproduce the shape of the loops at the tempo of the target. Participants performed sixteen trials in a 2 x 2 design, eight trials with their trace visible on the computer monitor and eight trials without a visible trace, half with a constant target rate and half with a variable rate change mid-trial.;Spatial accuracy was greater when the participant trace was visible, as expected (p < .0001). An inverse relationship was found between drawing speed and spatial accuracy, consistent with the expectation that more spatial errors would occur at increased speeds. However, timing accuracy (p < .0001) and smoothness ( p = .0026) decreased when the participant trace was visible. These results suggest that the visual trace of the participant tracking presented on the computer screen disrupted timing characteristics of perception-action coupling and increased the complexity of the task. Findings are discussed in the context of cognitive load.
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机译:在绘制循环跟踪任务期间,研究了同时显示的手部运动视觉轨迹对时间,平滑度和空间精度的影响。 35位健康的年轻右撇子成年人在数字化板上使用手写笔跟踪计算机监视器上显示的从左到右的循环绘图动画。点目标移到了12个相连的草书字母e的模板上,并在该系列的每个循环上绘制了轨迹。指示参与者与目标一起绘制,以目标的速度再现循环的形状。参加者以2 x 2设计进行了16次试验,其中8次试验的痕迹在计算机监视器上可见,另外8次试验的痕迹不可见,一半在目标速率不变的情况下进行,另一半在试验中率变化的情况下进行。如预期的那样,当参与者的迹线可见时,该值会更大(p <.0001)。在绘制速度和空间精度之间发现了反比的关系,这符合人们的期望,即随着速度的增加,会出现更多的空间误差。但是,当参与者迹线可见时,计时精度(p <.0001)和平滑度(p = .0026)降低。这些结果表明,计算机屏幕上呈现的参与者跟踪的视觉轨迹破坏了感知-动作耦合的时序特性,并增加了任务的复杂性。在认知负荷的背景下讨论了发现。
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