What is a psychometric curve?

Answer Posted / vishaal

The psychometric curve is obtained while recording the
threshold of balance with the constant stimuli method. The
data refer to a fixed value of the luminance of the
reference, LBC.

In some cases this curve is simply sigmoid-like, and to the
left of the threshold value, c, the weight of the reference
is superior to that of the sample to the right, the weight
of the test is superior.

In cases where the psychometric curve is compound, the
balance occurs between a and b. To the left of a, and to
the right of b, there is unbalance in op-posite directions.

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