Signal Detection Theory Visualizer & Tester
An interactive tool to explore theory and test your own detection performance.
Theoretical Distributions
Adjust the properties of the noise (blue) and signal (green) distributions. Move the decision threshold (red dashed line) to see how it affects classification outcomes.
Noise Parameters
Decision
Signal Parameters
Theoretical Metrics
Sensitivity (TPR):
0.0%
TP / (TP + FN)
Specificity (TNR):
0.0%
TN / (TN + FP)
Accuracy:
0.0%
(TP+TN) / (All)
d': 0.000
(μs - μn) / √(0.5(σs2 + σn2))
c: 0.000
-0.5 * (Z(H) + Z(F))
Theoretical Matrix
| Actual Condition | ||
|---|---|---|
| Signal Present | Signal Absent | |
| Predicted Response |
0.0%True Positive |
0.0%False Positive |
0.0%False Negative |
0.0%True Negative |
|
ROC Curve
Plots TPR vs. FPR.
AUC: 0.000
Detection & Discrimination Tests
Auditory Test
Visual Test
Face Test
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Did you detect a signal?
Test Results
| Actual Condition | ||
|---|---|---|
| Signal Present | Signal Absent | |
| Predicted Response |
0.0%Hits (0) |
0.0%False Alarms (0) |
0.0%Misses (0) |
0.0%Correct Rejects (0) |
|
Hit Rate (TPR):N/A
False Alarm Rate (FPR):N/A
Criterion (c):N/A
Liberal
Neutral
Conservative