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1 n.bernardi2@campus.unimib.it, 2 alexschories@gmx.de, 3 jabusch@hfmdd.de, 4 barbara.colombo@unicatt.it, 5 altenmueller@hmt-hannover.de ABSTRACTMental Practice (MP) refers to a complex network of strategies for improving musical performance without physically performing at the instrument. The present study represents an attempt to describe cross-individual differences in the use of different MP strategies, allowing direct predictions on which strategies are more likely to be effective. Sixteen pianists were studied while memorizing piano pieces. Each subject memorized two pieces of comparable length and difficulty, one by MP and the other by Physical Practice (PP), on two different days according to standardized protocols. During MP subjects were free to apply any practice strategies they preferred except for physically playing a real piano (ecological approach). Practice and performances were video-documented; performances were judged by independent expert raters. Participants reported their practice strategies in researcher-developed questionnaires. MP alone produced successful musical learning. MP, even combined with PP, produced poorer performance compared with PP alone. MP outcomes were significantly influenced by the strategies applied. These results directly impact on musicians' daily schedule and managing of health-risk factors, since valuable performance results can be achieved by combining optimally designed mental practice with short physical practice focused on strengthening the internal representation of the piece.

The role of prefrontal cortex (PFC) in influencing creative thinking has been investigated by many researchers who, while succeeding in proving an effective involvement of PFC, reported suggestive but sometimes conflicting results. In order to better understand the relationships between creative thinking and brain activation in a more specific area of the PFC, we explored the role of dorsolateral PFC (DLPFC). We devised an experimental protocol using transcranial direct-current stimulation (tDCS). The study was based on a 3 (kind of stimulation: anodal vs. cathodal vs. sham) × 2 (priming: divergent vs. convergent) design. Forty-five healthy adults were randomly assigned to one stimulation condition. Participants’ creativity skills were assessed using the Product Improvement subtest from the Torrance Tests of Creative Thinking (TTCT). After 20 min of tDCS stimulation, participants were presented with visual images of common objects. Half of the participants were instructed to visualize themselves using the object in an unusual way (divergent priming), whereas the other half were asked to visualize themselves while using the object in a common way (convergent priming). Priming was aimed at inducing participants to adopt different attitudes toward the creative task. Afterwards, participants were asked to describe all of the possible uses of the objects that were presented. Participants’ physiological activation was recorded using a biofeedback equipment. Results showed a significant effect of anodal stimulation that enhanced creative performance, but only after divergent priming. Participants showed lower skin temperature values after cathodal stimulation, a finding which is coherent with studies reporting that, when a task is not creative or creative thinking is not prompted, people show lower levels of arousal. Differences in individual levels of creativity as assessed by the Product Improvement test were not influential. The involvement of DLPFC in creativity has been supported, presumably in association to shift of attention modulated by priming.