Phenomenological methods The type of introspec- tive analysis that focuses on intact mental phenomena rather than on isolated mental elements.
Principle of contrasts According to Wundt, the fact that experiences of one type often intensify opposite types of experiences, such as when eating something sour will make the subsequent eating of something sweet taste sweeter than it would otherwise.
Principle of the heterogony of ends According to Wundt, the fact that goal-directed activity often causes experiences that modify the original motivational pattern.
Principle toward the development of oppo- sites According to Wundt, the tendency for prolonged experience of one type to create a mental desire for the opposite type of experience.
Pure phenomenology The type of phenomenology proposed by Husserl, the purpose of which was to create a taxonomy of the mind. Husserl believed that before a science of psychology would be possible, we would first need to understand the essences of those mental pro- cesses in terms of which we understand and respond to the world.