Importantly, there were highly significant spatial attention × hemisphere interactions (P1: F (1,28) = 11.89, p = .002, η 2 p = 0.30; N1: F (1,28) = 30.13, p <.0001, η 2 p = 0.52), which resulted from both the P1 and N1 amplitudes being significantly larger in response to spatially attended than unattended visual
Post hoc comparisons conducted on the Nd amplitudes (i.e., target minus nontarget difference) within 250–300 ms and 300–350 ms revealed that the representation‐driven Nd amplitude for auditory‐only stimuli tended to be smaller (with marginal significance) than that for audiovisual stimuli with visual‐spatial attention during 300–350 ms (250–300 ms: F (1,28) = 0.90, p FDR = .351, η 2 p = .03; 300–350 ms: F (1,28) = 3.83, p FDR = .080, η 2 p = .12), and was significantly smaller than that for audiovisual stimuli without visual‐spatial attention during 300–350 ms (250–300 ms: F (1,28) = 4.98, p FDR = .067, η 2 p = .15; 300–350 ms: F (1,28) = 12.63, p FDR = .005, η 2 p = .31).