basic experimental question

[theonlytycrane]

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For baseline level of activity, would this be the minimum weight of a marble to be detected as a stimulus? This should be included for a valid study, but wouldn't change the constant relationship between difference threshold and background intensity as shown, correct?

 

[salemstein]

I would assume so... After all, though the experiment tests for JND, you still need to overcome the Absolute threshold to be able to detect anything.