Zelic Gregory, Varlet Manuel, Wishart Jodie, Kim Jeesun, Davis Chris
The MARCS Institute for Brain, Behaviour & Development, Western Sydney University, Sydney, NSW, Australia.
The MARCS Institute for Brain, Behaviour & Development, Western Sydney University, Sydney, NSW, Australia.
Neurosci Lett. 2018 Sep 14;683:150-159. doi: 10.1016/j.neulet.2018.07.044. Epub 2018 Jul 31.
There is growing evidence that movement synchronisation to an external rhythm is affected by the type of pacers involved. Specifically, visuomotor synchronisation (VMS) is facilitated when the pacer is continuous (continuity condition) and moves in the same direction as the movement produced (pattern matching condition). However, the extent to which the continuity and pattern matching conditions each contribute to facilitation of VMS remains unclear. The present study aimed to disentangle the potential dual influence of pacer continuity and pacer pattern on VMS. Twenty participants were asked to synchronise continuous left-right forearm movements of tracking (continuous VMS - Experiment 1) or discrete up-down finger movements of tapping (discontinuous VMS - Experiment 2) with four visual pacers. The pacers consisted of a red dot target that either oscillated (continuous pacers) or flashed (discrete pacers) periodically. The target also exhibited a left-right (left-right pacers) or a centred (centred pacers) movement pattern. Results showed lower variability in synchrony with the continuous visual pacer that respectively matched the left-right and the centred movement pattern of forearm and finger tapping. Both the continuity condition and the pattern matching condition facilitated VMS when synchronising continuous forearm tracking movements (Experiment 1) whereas both conditions were required to facilitate VMS when synchronising discrete finger tapping movements (Experiment 2). These results provide new insights into the mechanisms underlying VMS and how they are modulated by variations in pacer pattern and pacer continuity.
越来越多的证据表明，与外部节奏的运动同步受所涉及的起搏器类型影响。具体而言，当起搏器是连续的（连续条件）并且与所产生的运动方向相同（模式匹配条件）时，视运动同步（VMS）会得到促进。然而，连续性条件和模式匹配条件各自对VMS促进作用的程度仍不清楚。本研究旨在厘清起搏器连续性和起搏器模式对VMS的潜在双重影响。20名参与者被要求将跟踪的连续左右前臂运动（连续VMS - 实验1）或敲击的离散上下手指运动（不连续VMS - 实验2）与四个视觉起搏器同步。起搏器由一个红色点目标组成，该目标要么周期性振荡（连续起搏器）要么闪烁（离散起搏器）。该目标还呈现出左右（左右起搏器）或居中（居中起搏器）的运动模式。结果显示，与分别匹配前臂和手指敲击的左右和居中运动模式的连续视觉起搏器同步时，同步变异性较低。在同步连续前臂跟踪运动时（实验1），连续性条件和模式匹配条件都促进了VMS，而在同步离散手指敲击运动时（实验2），两种条件都需要才能促进VMS。这些结果为VMS的潜在机制以及它们如何通过起搏器模式和起搏器连续性的变化进行调节提供了新的见解。
