We have shown selective adaptation within two types of volitional saccade pair, and confirmed their adaptation selectivity. Deubel claimed adaptation selectivity only between volitional and reflexive saccades. So we re-examined whether Deubel's scan saccades might have involved two types of volitional saccades. However, our result suggested that scan saccades contain almost one type of volitional saccade, not two of them. Furthermore, our result suggested that scan saccade may be a new type of saccade different from these two types. We may need further experiments.