One may think that insufficient task difficulty in the go/no-go task explains the lack of the difference in preference for the no-go stimuli between the first and second ratings. More specifically, the demand for inhibitory control might not be sufficient if the go/no-go task is relatively easy for participants. However, in Experiment 2, participants’ preference for the no-go stimuli did not differ between the first and second ratings, despite the fact that task difficulty in the go/no-go task was greater than that in Experiment 1. In addition, false alarm rate, which is one of the indexes of task difficulty, was equivalent or higher in the present study than were those reported in previous studies that have demonstrated emotional devaluation due to response inhibition (Kiss et al., 2008; Doallo et al., 2012). Therefore, the results of Experiments 1 and 2 suggest that the lack of the difference in preference for the no-go stimuli between the first and second rating could not be attributed to the insufficient task difficulty in the go/no-go task.