Guilfords (1956) distinction between divergent and convergent thinking is still important for the psychological research of creativity. Neurophysiological measures show correlations between creative, divergent thinking and EEG alpha synchronization (8-12 Hz) (e.g. Martindale and Hasenfus, 1978). Moreover, studies highlight a correlation between high internal top-down processing demands and alpha synchronization (e.g. Benedek et al., 2011). This study tries to examine the influence of bottom-up processing demands in divergent thinking tasks on EEG alpha synchronization. In more detail, this research analyses, if the use of stimulus driven information processing in divergent thinking tasks results in less alpha-synchronization, compared to the results, if the same tasks are processed in top-down demands. In a sample of N = 40 subjects two types of well-known divergent tasks (Schoppe, 1975), (one is particulary bottom-up and the other concept-driven top-down suited), were administered during EEG recording in two different conditions, which initiate stimulus-driven or concept-driven processing demands. The results underline the expected connections between different mental processing demands and alpha synchronization. The concept-driven task shows no influence of condition, whereas the stimulus-driven suited task show significant alpha synchronization in the condition, which in turn initiate a top-down process. On the one hand, current findings support expectations (e.g. Benedek et al. 2011) that bottom-up processing demands have a minor influence in divergent tasks on alpha synchronization in EEG. On the other, top-down processing is an indicator for more alpha synchronization.