Denoising forced-choice detection data
Denoising forced-choice detection data
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DOI：
10.1348/000711009x424057
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发表时间：
2010-02-01
影响因子：
2.6
通讯作者：
Garcia-Perez, Miguel A.
中科院分区：
文献类型：
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作者：
Garcia-Perez, Miguel A.
在两种选择的强迫选择（2AFC）检测任务中，观察者需要在两种表现都没有显示刺激的情况下随机做出反应（猜测）。观察者也可以被指示在这些试验中使用一个“猜测”键，这个键会产生一个随机的猜测，也会记录下计算机生成的猜测所产生的正确或错误的反应。一项模拟研究表明，对2AFC数据进行“去噪”处理，得到的检测阈值估计值和心理测量函数的传播比在没有这些信息的情况下得到的估计值要精确得多，并且与在相同次数的试验中运行是非题任务时得到的估计值的精度相当。模拟还表明，部分遵守使用“猜测”键的指示会降低估计的质量，但如果观察者仍然适度遵守，则估计的质量仍然比从传统2AFC数据中获得的结果更精确。一项检验模拟结果有效性的实证研究表明，去噪后的2AFC估计的传播明显优于传统的2AFC估计，与是-否估计相似，但在观察者和会话之间阈值的变化掩盖了阈值估计去噪的好处。实证研究还证明了除了在2AFC任务中定义的传统响应键之外，使用“猜测”键的可行性。
Observers in a two-alternative forced-choice (2AFC) detection task face the need to produce a response at random (a guess) on trials in which neither presentation appeared to display a stimulus. Observers could alternatively be instructed to use a 'guess' key on those trials, a key that would produce a random guess and would also record the resultant correct or wrong response as emanating from a computer-generated guess. A simulation study shows that 'denoising' 2AFC data with information regarding which responses are a result of guesses yields estimates of detection threshold and spread of the psychometric function that are far more precise than those obtained in the absence of this information, and parallel the precision of estimates obtained with yes-no tasks running for the same number of trials. Simulations also show that partial compliance with the instructions to use the 'guess' key reduces the quality of the estimates, which nevertheless continue to be more precise than those obtained from conventional 2AFC data if the observers are still moderately compliant. An empirical study testing the validity of simulation results showed that denoised 2AFC estimates of spread were clearly superior to conventional 2AFC estimates and similar to yes-no estimates, but variations in threshold across observers and across sessions hid the benefits of denoising for threshold estimation. The empirical study also proved the feasibility of using a 'guess' key in addition to the conventional response keys defined in 2AFC tasks.