Exact(8)
Sources of uncertainty include equally plausible alternative explanations, missing information, incorrect object and event typing, diffuse evidence, ambiguous references, prediction of future events, and deliberate deception.
Serious flaws like merging of more than one object, incorrect object shape and deformation of its contour and cues may happen if moving shadows are not removed from the target object.
Touching the incorrect object caused both objects to disappear immediately and no reward was delivered.
These "inaccurate" touches were recorded separately from errors (i.e., choices of the incorrect object).
A touch to the incorrect object caused the screen to blank immediately.
If it brought the incorrect object or no object at all, the owner asked for the same object again.
A touch to the incorrect object caused the screen to blank immediately, followed by a 20-s intertrial interval.
If the subject returned an incorrect object the experimenter dropped it in the blue bowl on her left and gave no reward.
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