The investigators recently showed that visuomotor integration was significantly altered in schizophrenic patients during: (i) a grip force task (Teremetz et al., 2014), and (ii) a saccadic paradigm (oculomotor task)(Amado et al., 2008). Given this findings, the investigators propose a combined study of oculomotor and grip force control to better characterize the sensorimotor integration deficit. This approach may allow for identification of behavioural biomarkers of vulnerability to develop schizophrenia.