<p>There's actually a very simple answer to this question: calculate criterion of confidence level = 3 by counting as hits only those trials where the answer was correct (and the target was there), and confidence was equal or higher than 3. </p>

<p>This is also what Rahnev et al did in the following paper:
Rahnev, D., Koizumi, A., McCurdy, L. Y., D’Esposito, M., &amp; Lau, H. (2015). Confidence Leak in Perceptual Decision Making. Psychological Science, 0956797615595037. <a href="http://doi.org/10.1177/0956797615595037" rel="nofollow">http://doi.org/10.1177/0956797615595037</a></p>

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2015-11-06T10:09:31.660Z
2015-11-06T10:09:31.660Z
elisa
<p>Take a 2AFC task, where people also give a measure of confidence. 
In the framework of signal detection theory, the criterion values for each confidence level are simply additional criteria, placed on the same internal response axis as the (first order task) decision criterion. </p>

<p>Can I estimate the values of these additional confidence criteria from the data of a subject? If so, how? Would I simply take all trials with (say) confidence = 3, and calculate the criterion based on those trials alone?</p>

<signal-detection>
Calculate criterion values for each confidence level (within SDT)
elisa
# Calculate criterion values for each confidence level (within SDT)

(Asked by: username_0 on 2015-08-27)

Take a 2AFC task, where people also give a measure of confidence.
In the framework of signal detection theory, the criterion values for each confidence level are simply additional criteria, placed on the same internal response axis as the (first order task) decision criterion.

Can I estimate the values of these additional confidence criteria from the data of a subject? If so, how? Would I simply take all trials with (say) confidence = 3, and calculate the criterion based on those trials alone?

**Tags:** signal-detection


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## 1 answers

### Answer by username_0 on 2015-11-06. Score: 2 | Accepted answer

There's actually a very simple answer to this question: calculate criterion of confidence level = 3 by counting as hits only those trials where the answer was correct (and the target was there), and confidence was equal or higher than 3.

This is also what Rahnev et al did in the following paper:
Rahnev, D., Koizumi, A., McCurdy, L. Y., D’Esposito, M., & Lau, H. (2015). Confidence Leak in Perceptual Decision Making. Psychological Science, 0956797615595037. <http://doi.org/10.1177/0956797615595037>


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