Bar graphs depicting the average proportion (across participants) of COIs (n = 108) for which a given effect was observed. (A) ERPs: percentage of COIs showing a significant response (compared to baseline) for Audio-Visual (AV-red), Visual-alone (V-blue) and Auditory-alone (A-green) conditions, and showing a significant multisensory effect assessed using the maximum model criterion (AV vs. V ; with dark red representing enhanced effect and dark blue a suppression effect), and the additive model criterion (AV vs. A+V ; with dark red representing supra-additive effect and dark blue-green a sub-additive effect). (B) PCIs: percentage of COIs showing a significant difference from baseline for Audio-Visual (AV-red), Visual-alone (V-blue) and Auditory-alone (A-green) conditions. Results for Theta-Alpha (6–10Hz), Beta (13–30Hz) and Gamma (30–50Hz) bands are depicted separately. The patched area represents co-occurring significant power modulations compared to baseline. (C) PCIs: percentage of COIs showing a significant auditory modulation of the visual response assessed using the the maximum model (AV vs. V ; with dark red representing enhanced effect, and dark blue a suppression effect).(D) PCIs: percentage of selected COIs (n = 90 ; that presented cross-sensory auditory response and/or auditory modulation of the visual response as assessed by the max model) showing non-linear MSI effects as measured by the additive model (AV vs. A+V ; with dark red representing a supra-additive effect, and dark blue-green a sub-additive effect). For both (C) and (D), the results of Theta-Alpha (6–10Hz), Beta (13–30Hz) and Gamma (30–50Hz) bands are depicted separately.