Data from a detection task in which the observer gave ratings (1–5) indicating his confidence that a signal was presented on that trial. The signal was a 3 deg square patch of luminance, fixated centrally, embedded in a 10 deg field of random luminance pixels. The signal was 64 x 64 pixels. During the experiment, 6 luminance contrast levels were randomly presented and at an equal rate, randomly interspersed catch-trials in which the signal was absent.
A data frame with 196 observations on the following 3 variables.
a numeric vector indicating the luminance contrast of the signal, 0 is a catch trial.
a numeric vector indicating the confidence rating of the observer as to the presence of the signal
a logical vector indicating whether the signal was present or not on the trial
Data kindly provided by Fr\'ed\'eric Devinck.
Devinck, F. (2003) Les traitements visuels chez l'homme : strat\'egies de classification de la forme. Universit\'e Lyon 2, Doctoral Thesis.
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