Skilled forelimb reaching for pasta guided by tactile input in the rat as measured by accuracy, spatial adjustments, and force
Skilled forelimb reaching for pasta guided by tactile input in the rat as measured by accuracy, spatial adjustments, and force
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DOI：
10.1016/s0166-4328(99)00164-3
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发表时间：
2000-04-01
影响因子：
2.7
通讯作者：
Whishaw, IQ
中科院分区：
文献类型：
--
作者：
Ballermann, M;Tompkins, G;Whishaw, IQ
老鼠能够用一只前肢去够食物，但由于它们是用嗅觉来定位它们的目标，所以还不清楚它们是如何调整肢体运动来补偿错误的。虽然人们认为它们的伸展运动是弹道式的，只能通过试错来调整，但它们是否使用触觉线索来帮助定位和识别目标还没有被研究过。本研究解决了这个问题，让大鼠达到通过一个插槽的刚性举行的生面团片的厚度不同，这可以是垂直或水平方向从不同的点周围的插槽，并连接到一个力传感器。这些任务要求动物不仅要根据目标的位置调整它们的伸手和抓握，还要根据目标的质地识别目标。采集曲线由头部方向、肢体运输轨迹、每次成功的尝试次数、爪方向、断裂方向和抓握力组成。触觉辨别测试使用面食和具有不同触觉特性的类似大小的金属棒作为辨别。结果表明，而姿势的方向和肢体运输轨迹没有修改为目标方向的函数，爪子方向和把握力的目标对象的感觉质量的函数而变化，大鼠可以作出触觉的目标对象的歧视性选择。结果表明，大鼠能够调整爪子的运动，使用触觉信息，这表明在食肉动物和灵长类动物的肢体和爪子运动的感觉运动控制的躯体感觉功能是由啮齿动物共享。这种共性表明哺乳动物的运动控制是保守的：解释了大鼠到达行为的一些特质特征，并证实啮齿动物为研究感觉运动功能提供了一个很好的模型。(C)2000 Elsevier Science B.V.保留所有权利。
Rats are capable of reaching for food with a single forelimb, but since they locate the target of their reach using olfaction, it is unclear how they adjust their limb movement to compensate for errors. Although it is thought that their reaching movement is ballistic and can only be adjusted by trial and error, whether they cap use haptic cues to aid in locating and identifying a target has not been examined. The present study addressed this question by allowing rats to reach through a slot for rigidly held pieces of uncooked pasta of varying thickness, which could be oriented vertically or horizontally from different points around the slot and which were attached to a force transducer. The tasks required that animals not only adjust their reach and grasp to the target's location but also identify the target based on its texture. Acquisition curves were made of head orientation, limb transport trajectories, number of attempts per success, paw orientation, breaking direction and force of the grasp. A haptic discrimination test used pasta and similar sized metal rods with different tactile properties as discriminanda. The results indicated that whereas postural orientation and limb transport trajectory were not modified as a function of target orientation, paw orientation and grasp force did vary as a function of the sensory qualities of the target object, and the rats could make a haptic discriminative choice of a target object. The results show that the rat is capable of adjusting paw movements using haptic information, suggesting that somatosensory features of sensorimotor control of limb and paw movements in carnivores and primates are shared by rodents. This commonality points to a conservation of motor control in mammals: explains some of the idiosyncratic features of rat reaching behavior, and confirms that rodents provide a good model for investigating sensorimotor functions. (C) 2000 Elsevier Science B.V. All rights reserved.