Thank you Erick for reminding us of the treasure the Macmillan and Creelman book represents for anybody trying to play with psychophysics in the lab.
On 9/16/13 6:31 PM, "Gallun, Frederick J. (Portland)" <Frederick.Gallun@xxxxxx> wrote:
“For measuring response bias [in the 2AFC task], the methods [for the YN task] are entirely adequate. No sqrt(2) adjustment is necessary, because (as the reader may not be surprised to learn) bias in one task cannot be predicted from bias in the other.”
Macmillan and Creelman, Detection Theory: A User’s Guide, 2nd Edition, p. 170.
Frederick (Erick) Gallun, PhD
Associate Professor, Dept. of Otolaryngology, Oregon Health & Science University
National Center for Rehabilitative Auditory Research
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From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxxxxxxxxx] On Behalf Of Sam Mathias
I think I know the answer to this question, but I'd rather be totally sure. When calculating sensitivity (d') in a 2AFC experiment, one needs to apply the sqrt(2) correction to the standard YN equation. My question is whether the same correction needs to be applied when calculating the criterion (c) in 2AFC.
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