What can fMRI tell us about functional variability in the oculomotor system and saccade 1 performance ? 2 Jason

45 Eye movement behaviour is variable and the brain’s oculomotor circuitry may not always 46 function consistently. In a recent fMRI study, Ozyurt and Greenlee (2011) correlated the 47 activation strength of cortical and striatal brain regions with interand intra-individual variability 48 in saccade performance. We discuss the design and implications of this study with regard to the 49 differences between interand intra-individual variability, and the link between the BOLD signal 50 and oculomotor activity. 51