1. Institute of Psychology; University of Goettingen; Kellnerweg 6 37077 Goettingen Germany
2. Emmy Noether Research Group; Faculty of Biology and Psychology; University of Goettingen; Kellnerweg 6 37077 Goettingen Germany
3. The Procter & Gamble Company; Greater London Innovation Centre; Rusham Park, Whitehall Lane Egham KT15 2HT UK