One motivation for reframing a signal detection task in FSDT form is to
obtain a better understanding of the response to stimuli that are near the
signal threshold. Near- misses would be classified as no- signal in the con-
ventional approach, but would be recognized as such in FSDT. A trend that
appears in the comparison of conventional and FSDT analysis is that FSDT
produces lower hit rates and lower false alarm rates. Stimuli that are closer
to the threshold can be ambiguous for multiple reasons. Luggage screening in
airports is challenged by dierences in luggage design, many possible shapes
of several classes of threatening ...
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