The grand ERPs at contralateral electrodes.

(a) at SOA 700 ms: left, enhanced N1 component in invalid-cued trials than in valid-cued trials in the healthy control group (HC); right, significantly enhanced N1 component in invalid-cued trials than in valid-cued trials in the schizophrenia group (SCZ); (b) at SOA 1200 ms: left, no significant cuing effect for N1 component in the HC group; right, significantly enhanced N1 component in invalid-cued trials than in valid-cued trials in the SCZ group.