Executing the Homebound Path Is a Major Source of Error in Homing by Path Integration
Executing the Homebound Path Is a Major Source of Error in Homing by Path Integration
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DOI：
10.1037/xhp0000875
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发表时间：
2021-01-01
影响因子：
2.1
通讯作者：
Warren, William H.
中科院分区：
文献类型：
--
作者：
Chrastil, Elizabeth R.;Warren, William H.
路径整合——环境中位置和方向的不断更新——是空间导航的重要组成部分，然而，人们对其机制知之甚少。本研究的目的是（a）测试路径集成的编码误差模型，该模型仅关注编码作为潜在的误差源，以及（b）开发最能预测路径集成误差的路径集成模型。我们通过独立测量参与者在距离和角度再现任务中的编码错误来测试编码错误模型。然后使用这些再现错误来预测个体参与者在三角形完成任务中的错误。我们使用蒙特卡罗方法对编码错误的分布进行采样来预测回家路径，然后将预测与观察到的三角形完成行为进行比较。三角形完成任务中的预测误差和实际误差之间的相关性非常弱，而仅使用执行误差的替代模型足以描述观察到的误差。包含编码和执行错误的模型最好地描述了三角形完成错误。这些结果表明，执行响应中的错误可能比编码错误对路径集成中的总体错误贡献更大，这对错误仅反映编码的假设提出了挑战。三角形完成中的错误可能不是因为不知道自己在哪里，而是因为无法回家。
Path integration-the constant updating of position and orientation in an environment-is an important component of spatial navigation, however, its mechanisms are poorly understood. The aims of this study are (a) to test the encoding-error model of path integration, which focuses solely on encoding as a potential source of error, and (b) to develop a model of path integration that best predicts path integration errors. We tested the encoding-error model by independently measuring participants' encoding errors in distance and angle reproduction tasks. and then using those reproduction errors to predict individual participants' errors in a triangle completion task. We sampled the distribution of encoding errors using Monte Carlo methods to predict the homebound path, and then compared the predictions to observed triangle completion behavior. The correlation between predicted errors and actual errors in the triangle completion task was extremely weak, whereas an alternative model using execution error alone was sufficient to describe the observed errors. A model incorporating both encoding and execution errors best described the triangle completion errors. These results suggest that errors in executing the response may contribute more to overall errors in path integration than do encoding errors, challenging the assumption that errors reflect encoding alone. Errors in triangle completion might not arise from failing to know where you are, but from an inability to get back home.