  Della Rocca, while holding a view different from that of Bennett regarding Spinoza’s theory of attributes, also finds himself having to account in some way for the unity of mind and body, and so he suggests that modes are said to be numerically identical when they share all of their neutral properties, where “neutral properties” are those properties which do not involve being thought under any particular attributes. This is contrasted with “intentional properties” which are attribute-dependent such as “being of a certain volume.” As an example of a neutral property, Della Rocca offers “having five immediate effects.” He then claims that if modes share all of their neutral properties, they are identical (that is, one and the same). Therefore, since my mind and my body share all of their neutral properties, they are identical (Della Rocca, 1996, 133–38).