Stimulus predictability mediates a switch in locomotor smooth pursuit performance for Eigenmannia virescens
Stimulus predictability mediates a switch in locomotor smooth pursuit performance for Eigenmannia virescens
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刺激可预测性介导 Eigenmannia virescens 运动平滑追踪性能的转变
DOI：
10.1242/jeb.048124
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发表时间：
2011
影响因子：
2.8
通讯作者：
N. Cowan
中科院分区：
文献类型：
--
作者：
Eatai Roth;K. Zhuang;Sarah A. Stamper;E. Fortune;N. Cowan
弱电动玻璃刀鱼，Eigenmannia virescens，将游泳向前和向后，使用推进从肛门带状鳍，响应运动的计算机控制的移动避难所。鱼被记录执行正弦（可预测）和西内斯（伪随机）避难轨迹的跟踪行为。对于所有的试验，我们观察到避难所和鱼的轨迹之间的高度一致性，这表明跟踪动态的线性。但叠加失败了：我们观察到可预测的单正弦刺激和不可预测的西内斯和刺激之间的跟踪的分类差异。这种非线性表明刺激介导的适应。在所有测试频率下，鱼在跟踪单正弦轨迹时表现出跟踪误差减少，这通常伴随着整体运动的减少。最值得注意的是，鱼表现出减少相位滞后时，跟踪单正弦轨迹。这些数据支持的假设，鱼产生的内部动力学模型的刺激运动，从而提高跟踪的可预测的轨迹（相对于不可预测的），尽管类似或减少电机成本。最近已经提出了类似的预测机制的基础上的动力学刺激运动，但几乎完全用于人类的非运动任务，如眼目标跟踪和姿势控制。这些数据表明，这种机制可能是共同的类群和行为。
SUMMARY The weakly electric glass knifefish, Eigenmannia virescens, will swim forward and backward, using propulsion from an anal ribbon fin, in response to motion of a computer-controlled moving refuge. Fish were recorded performing a refuge-tracking behavior for sinusoidal (predictable) and sum-of-sines (pseudo-random) refuge trajectories. For all trials, we observed high coherence between refuge and fish trajectories, suggesting linearity of the tracking dynamics. But superposition failed: we observed categorical differences in tracking between the predictable single-sine stimuli and the unpredictable sum-of-sines stimuli. This nonlinearity suggests a stimulus-mediated adaptation. At all frequencies tested, fish demonstrated reduced tracking error when tracking single-sine trajectories and this was typically accompanied by a reduction in overall movement. Most notably, fish demonstrated reduced phase lag when tracking single-sine trajectories. These data support the hypothesis that fish generate an internal dynamical model of the stimulus motion, hence improving tracking of predictable trajectories (relative to unpredictable ones) despite similar or reduced motor cost. Similar predictive mechanisms based on the dynamics of stimulus movement have been proposed recently, but almost exclusively for nonlocomotor tasks by humans, such as oculomotor target tracking and posture control. These data suggest that such mechanisms might be common across taxa and behaviors.
影响因子：
2.4
作者：
BLICKHAN, R
通讯作者：
BLICKHAN, R