| Popis: |
It is difficult to know the emotion of likes and dislikes. Questionnaire is the only method to know likes and dislikes, and has low reliability because it is not objective evaluation method. In this paper, we reported about a technique to distinguish the likes and dislikes objectively by measuring prefrontal blood flows, because emotions were based on pre-frontal activity. We show images of selected solid colors which were red, blue, orange, indigo, yellow, purple, green, black, and white, and we measured the blood flows of the subject, using near infra-red spectroscopy (NIRS). In addition, we asked subjects about likes and dislikes with the color by the order after the experiment. By the way, artifacts based on the body motion or change of the blood pressure are included the signal of the NIRS. Therefore, we obtained the approximation of the artifact using polynomial approximation algorithm. Then we subtract the approximation from the original signal. As the result of the subtraction, we confirmed the artifact was reduced. As the result of the experiment, the level of the oxyhemoglobin when the subject answered “I don’t like” was relatively high, compared with the level of the oxyhemoglobin when the subject answered “I like”. We consider that undesirable stimulus is more impressed than desirable stimulus. Furthermore, we consider that we will distinguish that likes and dislikes by measuring the cerebral blood flows in the future. |
