Frayne Ellie, Coulson Susan, Adams Roger, Croxson Glen, Waddington Gordon
University of Sydney, Faculty of Health Sciences Cumberland Campus, 75 East St., Lidcombe, Sydney, NSW 2141, Australia.
University of Sydney, Faculty of Health Sciences Cumberland Campus, 75 East St., Lidcombe, Sydney, NSW 2141, Australia.
Neurosci Lett. 2016 Dec 2;635:111-116. doi: 10.1016/j.neulet.2016.10.030. Epub 2016 Oct 19.
Laterality of function in the orofacial musculature suggests there may be side-to-side asymmetry of proprioceptive acuity in lip movement compared to the temporomandibular joint (TMJ). In the present work, 14 young adults were tested for acuity of lip and TMJ closure movements onto plugs varying from 5 to 8mm without visual feedback. Testing was conducted on both left and right sides, using the same psychophysical task and stimuli. Results showed superior proprioceptive acuity at the lips, with no significant side effect. However, there was side-to-side asymmetry in the correlations between proprioceptive performance for the two anatomical structures, with performance on the right side strongly correlated but not on the left. This is consistent with the need for coordination between structures during chewing. When acuity at different points in the stimulus range was examined, the right side lips were better with small stimuli. Overall, results support enhanced use-specific proprioception.
口面部肌肉组织功能的偏侧性表明，与颞下颌关节（TMJ）相比，唇部运动中本体感觉敏锐度可能存在左右不对称。在本研究中，对14名年轻成年人进行了测试，在没有视觉反馈的情况下，测试他们唇部和颞下颌关节闭合运动对5至8毫米不同大小塞子的敏锐度。在左右两侧都进行了测试，使用相同的心理物理学任务和刺激。结果显示唇部的本体感觉敏锐度更高，且无明显的侧方效应。然而，两个解剖结构的本体感觉表现之间的相关性存在左右不对称，右侧的表现高度相关，而左侧则不然。这与咀嚼过程中结构间协调的需求是一致的。当检查刺激范围内不同点的敏锐度时，右侧唇部对小刺激的表现更好。总体而言，结果支持增强特定用途的本体感觉。
