Department of Kinesiology and Health Science, Utah State University, 7000 Old Main Hill, Logan, UT, 84242, USA.
Psychol Res. 2021 Mar;85(2):857-864. doi: 10.1007/s00426-020-01287-3. Epub 2020 Jan 25.
The clock variance of intervals produced by one finger is reduced when that finger taps along with another finger (termed the bimanual advantage). The multiple-timekeeper model proposes a coupling of internal clocks, leading to reduced clock variance for bimanual timing. Alternatively, reduced variance for bimanual timing could result from additional sensory feedback from two fingers as opposed to one. We aimed to test the role of visual feedback in reducing temporal variability. Participants tapped unimanually and bimanually (with no table contact) in three conditions: full vision, blindfolded, and with additional visual feedback provided via a mirror reflecting the right hand. We predicted that temporal variability would be reduced for tapping with vision versus no vision, and when the left hand was represented by a mirror but did not actually tap. Additional, redundant visual information did not reduce temporal variability for any condition, suggesting that visual feedback is not crucial for bimanual advantage. These findings support the role of sensory feedback (namely, tactile, auditory, and proprioceptive) in reducing timekeeper variability during bimanual timing and argue against a strictly multiple-timekeeper model.
当一个手指与另一个手指一起敲击时，由一个手指产生的时间间隔的时钟方差会降低（称为双手优势）。多时钟模型提出了内部时钟的耦合，从而导致双手计时的时钟方差降低。或者，双手计时的方差降低可能是由于两个手指而不是一个手指提供了额外的感觉反馈。我们旨在测试视觉反馈在减少时间变化中的作用。参与者在三种条件下进行单手和双手（无桌面接触）敲击：全视觉、蒙住眼睛和通过镜子提供额外的视觉反馈，该镜子反映右手。我们预测，与无视觉相比，有视觉时敲击的时间变化会减少，而当左手由镜子表示但实际上并未敲击时，时间变化也会减少。对于任何条件，额外的冗余视觉信息都不会减少时间变化的可变性，这表明视觉反馈对于双手优势并非至关重要。这些发现支持了在双手计时过程中感觉反馈（即触觉、听觉和本体感觉）在减少时间保持器可变性中的作用，并反对严格的多时钟模型。
