| Forced Choice Methods |
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| Thresholds
for 2AFC < Thresholds for classical |
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| PMF
and 3RC |
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| • | Subject
is forced |
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| to
decide |
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| • | Often
perception |
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| far
below classical |
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| threshold |
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| • | Tendency
to persist |
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| with
“don’t know” |
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| • | Dependence
on |
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| subject-specific |
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| criterion |
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