Visuo-vestibular interaction: predicting the position of a visual target during passive body rotation

• Published in: Neuroscience Vol. 195; pp. 45 - 53
• Main Authors: Mackrous, I, Simoneau, M
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 10.11.2011; Elsevier
• Subjects: Adult; Biological and medical sciences; Brain - physiology; Cues; Eye and associated structures. Visual pathways and centers. Vision; Fundamental and applied biological sciences. Psychology; human; Humans; Learning - physiology; Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration; Neurology; Psychomotor Performance - physiology; Rotation; Space Perception - physiology; spatial orientation; Vertebrates: nervous system and sense organs; vestibular system; visual system; Young Adult; visual system; knowledge of result; analysis of variance; ANOVA; KR; LED; light-emitting diode; spatial orientation; MWW; human; vestibular system; Mann–Whitney–Wilcoxon; Human; Visual system; Spatial orientation; Vestibular system; Rotation; Inner ear; Organ of hearing
• ISSN: 0306-4522; 1873-7544
• DOI: 10.1016/j.neuroscience.2011.07.032

Abstract Following body rotation, optimal updating of the position of a memorized target is attained when retinal error is perceived and corrective saccade is performed. Thus, it appears that these processes may enable the calibration of the vestibular system by facilitating the sharing of information between both reference frames. Here, it is assessed whether having sensory information regarding body rotation in the target reference frame could enhance an individual's learning rate to predict the position of an earth-fixed target. During rotation, participants had to respond when they felt their body midline had crossed the position of the target and received knowledge of result. During practice blocks, for two groups, visual cues were displayed in the same reference frame of the target, whereas a third group relied on vestibular information (vestibular-only group) to predict the location of the target. Participants, unaware of the role of the visual cues (visual cues group), learned to predict the location of the target and spatial error decreased from 16.2 to 2.0°, reflecting a learning rate of 34.08 trials (determined from fitting a falling exponential model). In contrast, the group aware of the role of the visual cues (explicit visual cues group) showed a faster learning rate (i.e. 2.66 trials) but similar final spatial error 2.9°. For the vestibular-only group, similar accuracy was achieved (final spatial error of 2.3°), but their learning rate was much slower (i.e. 43.29 trials). Transferring to the Post-test (no visual cues and no knowledge of result) increased the spatial error of the explicit visual cues group (9.5°), but it did not change the performance of the vestibular group (1.2°). Overall, these results imply that cognition assists the brain in processing the sensory information within the target reference frame.