Figure 1.

Only three basic emotions can be activated by object pictures. (a) The distributions of responses from the object pictures from IAPS and CAPS show that joy, fear, and disgust are three major basic emotions. (b) Number of pictures for each categorized emotion. Pictures were categorized according to the emotion that gained more than half of the responses. (c) The average accuracy for each emotion is 67.3 ± 5.1% (n = 63) for neutral, 76.5 ± 3.9% (n = 32) for joy, 55.4 ± 3.7% (n = 16) for fear, and 71.4 ± 4.3% (n = 12) for disgust, respectively. (d) The averaged percentage of emotional responses (top label) for categorized neutral, joy, fear, and disgust pictures (left label).