Figure 3-2
fMRI results in the intraparietal sulcus when controlling for global interhemispheric activation differences: neurometric functions, visual weights and audiovisual variances. In intraparietal sulcus (IPS0–4), neurometric functions were fitted to the fraction of decoded “right” location responses plotted as a function of the mean audiovisual (AV) location (see figure 2 legend for additional information). To control for global interhemispheric activation differences, activation patterns were z normalized separately for the left and right hemisphere within each condition prior to multivariate decoding. A–D, Neurometric functions are plotted separately for the four conditions in our 2 (visual reliability: high, VR+ vs. low, VR-) x 2 (modality-specific report: auditory vs. visual) factorial design. E, In unisensory conditions, psychometric functions were fitted to the fraction of right location responses plotted as a function of the signal location from unisensory auditory (A) and visual conditions of high (V, VR+) and low (V, VR-) visual reliability. F, Visual weights (mean and 68% bootstrapped confidence interval): MLE predicted and empirical visual weights for 2 (visual reliability: high, VR+ vs. low, VR-) x 2 (modality-specific report: auditory vs. visual) AV conditions. To facilitate the comparison with the MLE predictions that do not depend on modality-specific report, the visual weights are also plotted after pooling the data across both report conditions and re-fitting the neurometric functions. G, Standard deviations (σ, mean and 68% bootstrapped confidence interval): Unisensory and audiovisual MLE predicted and empirical standard deviations for the same combination of conditions as in F. For illustrational purposes standard deviations were normalized by the auditory standard deviation. Download Figure 3-2, TIF file.