复杂行为的协调需要神经动力学和外围力学的知识。由于其实验可操作性,加利福尼亚海绵体的喂养系统是研究柔体系统神经力学问题的极好模型。先前的工作试图通过使用Hill型肌肉模型来表征负责向前移动Aplysia抓钳的关键量角器肌肉的力产生能力来阐明外围的机械性能,I2肌肉然而,I1/I3肌肉,这是aplysia\'sgrapper缩回的主要驱动因素,没有被定性。由于肌肉组织属性在生成功能行为中的重要性,了解像I1/I3复合物这样的肌肉特性可能有助于创建更真实的阿普西亚摄食行为模拟,这可以帮助更好地理解软体系统的神经力学。为了弥合这个差距,在这项工作中,I1/I3肌肉复合体使用力频率进行表征,长度张力,和力-速度实验表明,希尔型模型可以准确地预测其产生力的特性。此外,发现肌肉的峰值等距力和刚度超过I2肌肉的峰值,这些结果是在先前关于I1/I3复合物体内运动学研究的背景下进行分析的。
The coordination of complex behavior requires knowledge of both neural dynamics and the mechanics of the periphery. The feeding system of
Aplysia californica is an excellent model for investigating questions in soft body systems\' neuromechanics because of its experimental tractability. Prior work has attempted to elucidate the mechanical properties of the periphery by using a Hill-type muscle model to characterize the force generation capabilities of the key protractor muscle responsible for moving
Aplysia\'s grasper anteriorly, the I2 muscle. However, the I1/I3 muscle, which is the main driver of retractions of
Aplysia\'s grasper, has not been characterized. Because of the importance of the musculature\'s properties in generating functional behavior, understanding the properties of muscles like the I1/I3 complex may help to create more realistic simulations of the feeding behavior of
Aplysia, which can aid in greater understanding of the neuromechanics of soft-bodied systems. To bridge this gap, in this work, the I1/I3 muscle complex was characterized using force-frequency, length-tension, and force-velocity experiments and showed that a Hill-type model can accurately predict its force-generation properties. Furthermore, the muscle\'s peak isometric force and stiffness were found to exceed those of the I2 muscle, and these results were analyzed in the context of prior studies on the I1/I3 complex\'s kinematics in vivo.