探测试验
什么是探测试验（以及大鼠为何会作弊）
动物很聪明，有时聪明得让我们的测试都难不倒它们。
动物可能从未学会平台在哪里，却在水迷宫里表现得很好。它可能与池壁保持固定距离游动，或按某种模式扫过水池。原始笔记称之为作弊，并建议用探测试验来检验：
Rats can cheat!
Instead of learning where the platform is, they can learn search strategies. E.g., swim around at some distance from the side, or guess where the platform is, and make a series of sweeps. A good analysis program helps you distinguish this from spatial learning. Probe trials: There is no platform. The trial ends after 1-2 mins with you rescuing the rat. Only do this on trained rats, and not too often. Done at the start, it tests for spatial bias. Done at the end of training, it tests the rat's spatial learning.
原文（英文）：watermaze.org Part I, General Information。出自Richard Baker的原始资料。按原样转载，未作改动。Copyright Richard Baker© 2013. All Rights Reserved.
只对训练过的大鼠做探测试验，而且不要太频繁。
HVS Image解释了最常用的探测指标目标象限偏好。