**3.5 Brain activation by subjective ratings and/or by task**

Three different trends emerged from comparisons among areas showing statistically significant activation while the subjects performed tasks (Fig. 5). Statistically significant correlations related to subjective rating are shown in Figure 6. The first trend involved the statistically significant relationship between channels and brain activation during tasks but did not include a correlation with subjective ratings. Most channels followed this trend (86% of all channels). The second trend involved a statistically significant relationship between channel and brain activation during tasks and a significant correlation with subjective ratings. Only a few channels followed the second trend; one channel followed it under the written condition, two followed it under the smell condition, and five followed under the application condition. The third trend involved statistically non-significant relationships between channels and brain activation during a task but included significant correlations with subjective ratings. Thus, brain activations following the first and third trends showed stronger influences on subjective ratings.
