| Forced Choice Methods |
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| Subjective
methods: no objective criterion if |
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| subject
was right (“seen or not seen”) |
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| Objective
methods: (Bregmann, 1852) |
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| Alternative forced choice (AFC): |
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| 2 trial types: a) stimulus present |
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| b) stimulus not
present |
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| ̃ | choice
objectively right or false |
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| Detection
can be verified ! (Ask for the |
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| grating
orientation) |
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