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| Psychometric Function: |
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| Quantification |
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| 1. | 50 % threshold: S50:
S for which P = 0.5 |
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| 2. | Steepness: Steepness
of the function at S50 |
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| 3. | Curve
fitting: P(S) = F(S,
a) |
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| • | Free
parameters a |
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| • | fit
a => a* |
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| • | solve for S50 and |
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| steepness
using |
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| F(S50,
a*) = 0.5 |
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