however, if the subject made a mistake, the same combination was repeated until the animal chose the larger reward (correction trials) and thus the number of trials per session increased. on view from october 17 through october 23, 2014 at gallery 151. to find more about the smart ways to answer this question, let’s continue reading below. we require the use of a lock box so that your keys remain with you! when in doubt, inspect products prior to each use. before i knew it, they'd worked out a whole number and we put it in. 