Figure 6.

Dissociation between reliability and response amplitude. A, Dynamic range of responses. SD of the fMRI responses (dynamic range) for forward, time-reversed, and scrambled films. Time courses were sampled from a subset of the same regions of interest (MT+, STS, LS, TPJ, FEF and precuneus) used in Figure 2, B and C. Inset, Time course of responses for the forward and reversed-backward silent films from FEF in one representative subject. Bars and error bars indicate the mean and SD across observers (n = 8 for the forward and backward films; n = 5 for the scrambled films). Note that the dynamic range of the fMRI responses within each brain region was similar for all five films. B, fMRI responses to the block-alternation control experiment, in which short movie clips were presented forward (red) and backward (blue) relative to blank screen. Time courses were sampled from a subset of the same regions of interest (MT+, STS, FEF, LS, TPJ and precuneus) used in Figure 2. Dotted lines mark the beginning and end of the epoch. In all regions the response modulations evoked by the backward movie clips were the same as or larger than those evoked by forward clips.