意向性、心智模态与心智逻辑

将意向性的心灵活动与它们所指向或涉及的对象分割开来所得的一些'态度'，即为心智模态，它们由'相信'、'喜欢'、'坚持'等'心智模态词'所刻画。根据对象的种类，心智模态可划分为三种：　指向事态的认知模态、指向客体（包括人）的情感模态和指向行动的意志模态。它们可分别看成'从言模态'、'从物模态'和'从动模态'。心智模态词操作于相应的对象构成心智模态命题。心智模态逻辑或心智逻辑研究同种心智模态词构成的心智模态命题之间的逻辑关系，以及不同心智模态词构成的心智模态命题之间的逻辑关系。心智模态逻辑不同于皮亚杰所给出的心理逻辑，心智逻辑探讨的是心灵的结构。

Intentionality,Mental Modality and Mental Logic

By separating the activities of mind from the targets at which they are directed, some attitudes have been obtained. The attitudes are called 'mental modalities' which are described by mental modal words such as 'believe', 'like', and 'persist'. According to the types of targets, 'mental modalities' can be divided into three kinds: epistemic modality directed at the state of affairs, emotional modality directed at objects (including people), and volitional modality directed at actions. The three modalities can be regarded as 'de dicto', 'de re' and 'de acta' respectively. A mental modal proposition is formed when a mental modal word operates on its corresponding target. Mental logic researches the relationship between mental modal propositions formed by the same or different kinds of mental modal words. Unlike Piaget psychologic, mental logic is concerned with the structure of mind.