Now here again it is clear that there are many striking differences between the cases of observing my arm rising in this experiement or watching someone else getting out of bed and the case of finding myself getting up. There is, e.g., in this case a perfect absence of what one might call surprise, also I don't look at my own movements as I might look at someone turning about in bed, e.g., saying to myself, “Is he going to get up?”. There is a difference between the voluntary act of getting out of bed and the involuntary rising of my arm. But there is not one common difference between so-called voluntary acts and involuntary ones, viz., the presence or absence of one element, the “act of volition.”