⁹Studies in psychology have shown links between brain scans known to be associated with happiness and higher SWB (Urry et al. 2004). People who are more satisfied with their lives appear to live longer (Diener, Chan 2011). Early studies showed lower SWB predicted suicide (Helliwell 2007, Daly, Wilson 2009, Daly et al. 2013, Layard 2005), but a recent study by Case, Deaton (2015) found more mixed results.