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5

There are a huge number of paradigms that SDT can be applied to. The simplest is probably the so-called yes/no paradigm. You present a single stimulus (typically noise alone or signal plus noise) and ask was the signal present. The subject if forced to respond with either yes or no. This type of paradigm typically leads to a response bias. In a 2-interval, 2-...


5

Add 0.5 to the intercept and multiply the sigmoid by 0.5 since it now only spans a y-range half of before: y = 0.5 + 0.5 / (1 + np.exp(-k*(x-x0))) Generally, for any chance level: chance = 0.5 # between 0 and 1 y = chance + (1-chance) / (1 + np.exp(-k*(x-x0)))


5

In general, subjective sensation increases linearly with the the log of physical intensity, which is described by Fechner's law. We are sensitive to small variations when light is dim, but we need large differences in intensity under conditions of high luminance (Weber's law). This is a linear relation, but taken together with Fechner these findings are ...


3

The recent visual working memory literature has predominately used the method of adjustment. In particular, there is a lot of work using continuous color adjustment tasks: Wilken P., Ma W. (2004). A detection theory account of change detection. Journal of Vision, 4 (12): 11, 1120–1135. Zhang, W., & Luck, S. J. (2008). Discrete fixed-resolution ...


2

when I was planning a pilot study in which we planned to use cross-modality matching I came across some studies. Human Factors and Ergonomics researchers seem to still use the Method of Adjustment. At least, I found a couple of conference papers in which they examined warning signals for cars. Unfortunately, I don't remember the titles but I think one of ...


2

Method of adjustment is still in use in vision science, especially when dealing with illusions. Its major advantage over, for example, 2AFC tasks is the speed of estimation -- you need way less trials to measure the effect, which could be useful in clinical settings [1]. You could also try to search for "nulling" instead of "adjustment" -- nulling is the ...


1

Color constancy works only if the incident illumination contains a range of wavelengths. The different cone cells of the eye register different but overlapping ranges of wavelengths of the light reflected by every object in the scene. From this information, the visual system attempts to determine the approximate composition of the illuminating light. This ...


1

You have specifically asked about the "adaptations done by the brain" in your initial question and an interest in "what has been done towards finding the formula and what it was replaced with for the time being?" By formula, I'm assuming that you meant a perceptual algorithm that can be useful in machine learning and the attempt to reverse-engineer human's ...


1

Those responding make some very good points about being specific about operational definitions and such. However, I've argued -- in an evolutionary psych textbook -- that there is a probably a reason why discomfort from cold and electric shock have power laws with exponents greater than perceived brightness (at low stimulus intensities), for example. It's ...



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