Neuroscience Research Australia, Randwick, Sydney, NSW, Australia.
J Physiol. 2011 Feb 1;589(Pt 3):547-57. doi: 10.1113/jphysiol.2010.198689. Epub 2010 Nov 22.
If a weight is applied to a finger and the subject asked to produce the same force, the subject generates a force larger than the weight. That is, subjects overestimate the force applied by an external target when matching it. Details of this force overestimation are not well understood. We show that subjects overestimate small target weights, but not larger ones. Furthermore we show for the first time that the force overestimation consists of two components. The first component is a constant. The second component depends on the precise magnitude of the weight and is only present when subjects hold the target weight against gravity. We suggest that the two components are generated in different phases of the force-matching task, are due to different processes, and must have an influence on all proprioceptive judgements of force.
如果在手指上施加一个力，并要求对象产生相同的力，对象产生的力会大于所施加的力。也就是说，当对象匹配外部目标施加的力时，会高估施加的力。目前还不完全了解这种力的高估的细节。我们发现，对象会高估小目标的重量，但不会高估大目标的重量。此外，我们首次表明，力的高估由两个分量组成。第一个分量是常数。第二个分量取决于重量的精确大小，只有当对象将目标重量抵抗重力时才会出现。我们认为，这两个分量是在力匹配任务的不同阶段产生的，是由于不同的过程引起的，并且必须对所有关于力的本体感受判断产生影响。
