Figure 1.

Stimulus space and behavioral responses. A, Stimuli: five sample frames of a prototypical stimulus. B, Stimulus space and categorization tasks. Stimuli were generated by applying spatial morphing (steps of percentage stimulus B) between prototypical trajectories (e.g., A–B) and temporal warping (steps of time warping constant). Stimuli were assigned to one of four groups: A fast–slow (AFS), A slow–fast (ASF), B fast–slow (BFS), and B slow–fast (BSF). For the simple categorization task (left), the stimuli were categorized according to their spatial similarity: category 1 (red dots) consisted of AFS, ASF; category 2 (blue dots) consisted of BFS, BSF. For the complex task (right), the stimuli were categorized based on their spatial and temporal similarity: category 1 (red dots) consisted of ASF, BFS; category 2 (blue dots) consisted of AFS, BSF. C, Behavioral data. Average response accuracy (percentage correct responses) across all blocks included in the multivoxel pattern analysis and participants.