The Brain and Mind Institute, The University of Western Ontario, Canada.
Psychol Sci. 2013 Aug;24(8):1456-65. doi: 10.1177/0956797612473485. Epub 2013 Jun 13.
The perceptual system parses complex scenes into discrete objects. Parsing is also required for planning visually guided movements when more than one potential target is present. To examine whether visual perception and motor planning use the same or different parsing strategies, we used the connectedness illusion, in which observers typically report seeing fewer targets if pairs of targets are connected by short lines. We found that despite this illusion, when observers are asked to make speeded reaches toward targets in such displays, their reaches are unaffected by the presence of the connecting lines. Instead, their movement plans, as revealed by their movement trajectories, are influenced by the number of potential targets irrespective of whether connecting lines are present or not. This suggests that scene parsing for perception depends on mechanisms that are distinct from those that allow observers to plan rapid and efficient target-directed movements in situations with multiple potential targets.
感知系统将复杂的场景解析成离散的目标。当存在多个潜在目标时，规划视觉引导的运动也需要进行解析。为了研究视觉感知和运动规划是否使用相同或不同的解析策略，我们使用了连通性错觉，即观察者通常会报告看到的目标较少，如果目标对之间通过短线条连接。我们发现，尽管存在这种错觉，但当要求观察者在这种显示中快速向目标伸出手时，他们的伸手动作不受连接线的影响。相反，他们的运动计划，如通过他们的运动轨迹揭示的那样，受到潜在目标数量的影响，而不管是否存在连接线。这表明，用于感知的场景解析取决于与允许观察者在具有多个潜在目标的情况下规划快速有效的目标导向运动的机制不同的机制。
