Subjects in a two-level within-subjects experiment on reaction time respond to 2,000 stimuli in the first condition and then immediately respond to 2,000 more stimuli in the second condition. You notice that the subjects perform more poorly in the second condition than in the first. The confounding variable here is:
A) learning.
B) fatigue.
C) adaptation.
D) habituation.

Question

Quizplus · Accepted Answer

Fatigue is likely the confounding variable because responding to 2,000 stimuli in the first condition could tire the subjects, leading to poorer performance in the second condition.

Subjects in a Two-Level Within-Subjects Experiment on Reaction Time Respond