Cognitive and brain aging is strongly influenced by everyday settings such as work demands. Long-term exposure to low job complexity, for instance, has detrimental effects on cognitive functioning and regional gray matter (GM) volume. Brain and cognition, however, are also characterized by plasticity. We postulate that the experience of novelty (at work) is one important trigger of plasticity. We investigated the cumulative effect of recurrent exposure to work-task changes (WTC) at low levels of job complexity on GM volume and cognitive functioning of middle-aged production workers across a time window of 17 years. In a case-control study, we found that amount of WTC was associated with better processing speed and working memory as well as with more GM volume in brain regions that have been associated with learning and that show pronounced age-related decline. Recurrent novelty at work may serve as an ‘in vivo’ intervention that helps counteracting debilitating long-term effects of low job complexity.

Important decisions are usually made in groups: Boards of directors decide about business strategies, national parliaments about million dollar budgets, and international committees on how to handle financial crises. There are good reasons to use groups for these decisions: Groups have a larger pool of knowledge and abilities than individuals, and joint decisions may create greater acceptance. Much research has been done on this topic (for a review, see Kerr & Tindale, 2004), which has led to important insights concerning the role of preferences in group decision making (Davis, 1973), the processing and exchange of information (Greitemeyer & Schulz-Hardt, 2003;

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