Figure 1. Experimental procedures and behavioral performance.

(A) Experimental conditions. The upper row illustrates conditions with standard series for which the stimuli were presented in the median plane of the subject’s head, and the lower row illustrates conditions with standard series for which stimuli were presented laterally to the median plane of the subject’s head. The standard series (Std) was followed by a deviant (Dev) which was either craniocentric (cranDev, red) or allocentric (alloDev, blue). The angles next to the schematic heads (−12° and +12°) indicate the orientation of the head in relation to trunk median sagittal plane. The angles (−12°, +12°, +36°) adjacent to the loudspeakers and fixation targets (stars) indicate the stimulus positions. Only left to right head movements are shown. In half of the blocks, subjects had to perform right to left head orientations and the stimulation was accordingly mirror-symmetric. (B) Histogram of head positions: mean number of head positions before the deviants, averaged across subjects in one-degree-bins. Black bars indicate trials with head rotations that we deemed sufficiently accurate (within ±6°) to be included into the EEG analysis. Red bars indicate discarded trials. (C) Histogram of eye-in-head positions: mean number of eye-in-head positions at the time of deviant stimulation, averaged across subjects in one-degree-bins.