**6. Acknowledgements**

This work was supported by Fundação para a Ciência e Tecnologia (REEQ/879/PSI/2005; PTDC/PSI-PCO/110734/2009; IBB/CBME, LA, FEDER/POCI 2010), Max Planck Institute for Psycholinguistics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Vetenskapsrådet (8276), Hedlunds Stiftelse and Stockholm County Council (ALF, FoUU). Inês Bramão was supported by a PhD fellowship (FCT/SFRH/BD/27381/2006).
