ConfRates {MPDiR}

Confidence Ratings for Detection of Luminance Patch

Description

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.

Usage

data(ConfRates)

Format

A data frame with 196 observations on the following 3 variables.

Contrast

a numeric vector indicating the luminance contrast of the signal, 0 is a catch trial.

Rating

a numeric vector indicating the confidence rating of the observer as to the presence of the signal

Stim

a logical vector indicating whether the signal was present or not on the trial

Source

Data kindly provided by Fr\'ed\'eric Devinck.

References

Devinck, F. (2003) Les traitements visuels chez l'homme : strat\'egies de classification de la forme. Universit\'e Lyon 2, Doctoral Thesis.

Examples

data(ConfRates)