BDNF and Cognitive impairment: However, if we split the schizophrenia patients group into two subgroups according to their cognitive statuses (normal MoCA score vs. MoCA deficit score), we found a statistically significant positive correlation between the BDNF plasma levels and MoCA scores in the subgroup of patients with a cognitive deficit, according to the Spearman Rho test (p = 0.04).