We usually use the word ‘like’ when we see good pictures, e.g. in social networks. When we choose a picture that evokes the feeling of ‘like’ out of many pictures, we evaluate each picture based on our subjective and intuitive preference. We hypothesized that physiological responses arise when participants watch pictures that evokes the feeling of ‘like’. In this study, we examined whether we can measure physiological responses when participants feel ‘to like’ a picture they choose among many pictures. We measured electroencephalogram, electrooculogram, electrocardiogram, and respiration of the participants while these are choosing the best picture from a set of pictures which had different setting of depth of field. We found that EEG responses appears when the participant watched the best pictures which evokes the feeling of ‘like’.