Monocular rivalry minus blank baseline.

<p>(A) Activation for monocular rivalry (MR) with grating stimuli above the blank baseline condition at the three contrasts (9%, 18%, 36%). The lateral, ventral and medial views of the inflated brain are shown (right hemisphere only). Colour scale on this and subsequent Figures indicates statistically significant results ranging from t = 2.35 to 8.00 (orange-yellow) (FDR, p<0.05). Monocular rivalry showed a U-shaped function of activation as a function of contrast; there was higher activation in a number of different areas at 9% and 36%. Abbreviations: dorsolateral prefrontal cortex (DLPF); inferior parietal cortex (IP); occipital pole (OP); premotor cortex (PM); superior parietal cortex (SP); supplementary motor area (SMA); ventral temporal (VT); ventrolateral prefrontal cortex (VLPF). (B) Region of interest analysis for monocular rivalry, in terms of percent signal change above the blank baseline condition (average of six subjects). The results are shown for gratings at the three contrasts (9%, 18%, 36%). The analysis for areas V1, V2 and V3 was carried out only in the foveal part of each area (0–2.9 deg eccentricity). Generally, the results did not differ between the left and right hemisphere, and have been averaged. Statistically significant results (p<0.05) in this and subsequent Figures are labeled with an asterisk. As in panel (A), monocular rivalry showed a U-shaped function of activation as a function of contrast in many areas, particularly V2 and V3.