Abstract

We used force matching and verbal reports of finger force to explore a prediction of the iso-perceptual manifold concept, which assumes that stable percepts are associated with a manifold in the afferent-efferent space. Young subjects produced various force magnitudes with the index finger, middle finger, or both fingers together. Further, they reported the force level using a verbal scale and by matching the force with fingers of the contralateral hand. Force matching, but not verbal reports, showed larger variable errors for individual fingers in the two-finger task compared to the single-finger tasks. We discuss possible differences in afferent and efferent contributions to force perception at low and high forces based on the idea of motor control with referent coordinates for the effectors. The differences between the force matching and verbal reports are possibly related to neural circuitry differences between perceiving without action and perceiving-to-act.

摘要

我们使用力匹配和手指力的口头报告来探索等感知流形概念的预测，该概念假设稳定的感知与传入-传出空间中的流形相关联。年轻受试者用食指、中指或双指并拢产生不同的力大小。此外，他们使用语言量表并通过将力与对侧手的手指相匹配来报告力水平。与单指任务相比，双指任务中单个手指的力匹配显示出更大的可变误差，但不是口头报告。我们讨论了传入和传出对低力和高力的力感知的可能差异，基于运动控制的思想和效应器的参考坐标。