Abstract

Throwing performance, throwability perception and subjectively felt heaviness all depend on object size and weight. Here we investigate how size and weight must be detected to perceive throwability. In previous studies, the size-weight relation was detected by hefting an object in the hand and looking at it. Thus, it could be that detecting the size-weight relation and perceiving throwability entail a visual-kinesthetic multisensory process. On the other hand, it may be that a task-specific, action-relevant perceptual organization is required, meaning that we must perform a hand-arm action that is analogous to throwing to detect the perceptual information for throwability. In this case, haptic detection of size and weight via hefting would be sufficient. We tested these alternative hypotheses by manipulating the hefting method and found that when participants visually detected size and kinesthetically detected weight, they perceived throwability less accurately and less precisely than when detecting size and weight just haptically. Only in the latter case was felt heaviness consistent with perceived throwability. Hefting with eyes open or closed led to equivalent affordance perception and thus, perceiving throwability did not require multisensory processing. These results supported the task-specific device theory.

摘要

投掷性能、可投掷性感知和主观感觉的重量都取决于物体的大小和重量。在这里，我们研究如何必须检测大小和重量以感知可投掷性。在之前的研究中，大小重量关系是通过拿起手中的物体并观察它来检测的。因此，检测尺寸-重量关系和感知可投掷性可能需要视觉-动觉多感官过程。另一方面，可能需要特定于任务、与动作相关的感知组织，这意味着我们必须执行类似于投掷的手臂动作来检测可投掷性的感知信息。在这种情况下，通过举重对尺寸和重量进行触觉检测就足够了。我们通过操纵举重方法测试了这些替代假设，发现当参与者通过视觉检测尺寸和动觉检测重量时，与仅凭触觉检测尺寸和重量时相比，他们感知可抛性的准确度和精确度更低。只有在后一种情况下，才会感觉到与感知到的可投掷性一致的沉重感。睁眼或闭眼时的重量会导致等效的可供性感知，因此，感知可抛性不需要多感官处理。这些结果支持特定任务的设备理论。睁眼或闭眼时的重量会导致等效的可供性感知，因此，感知可抛性不需要多感官处理。这些结果支持特定任务的设备理论。睁眼或闭眼时的重量会导致等效的可供性感知，因此，感知可抛性不需要多感官处理。这些结果支持特定任务的设备理论。