caa a22 4500 44535321X CHVBK 20180317142851.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s00221-011-2588-0 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2588-0 Asymmetry in vestibular responses to cross-coupled stimulus [Elektronische Daten] [Jaime Mateus, Jorge Cañizales, Andrew Hearn, Laurence Young] Head turns performed while rotating about another axis result in a cross-coupled stimulus (CCS) to the vestibular system. The CCS causes a tumbling sensation, and the magnitude of the tumbling sensation is dependent on the type of head turn (HT) that is performed. Asymmetric CCS responses to different rotational directions are widely acknowledged, yet poorly understood. The objective of this study was to: 1) correctly describe the asymmetries in responses to different configurations of CCS stimulation and 2) test two previously proposed hypotheses for explaining the asymmetries, dominant direction, and dominant end position. The dominant direction hypothesis states that the tumbling sensations evoked by the CCS will be more intense for certain directions of the tumbling sensation than for others. The dominant end position hypothesis states that head turns ending in the nose-up position result in more intense sensations than those ending on the side positions. Subjects performed four types of 60-degree yaw head turns while lying horizontally on a centrifuge. Subjects were either supine or prone, while rotating clockwise or counterclockwise. Three experimental conditions were tested: clockwise supine (n=33); counterclockwise supine (n=10); and clockwise prone (n=10). Subjective tumbling intensity scores were recorded for each head turn. Head turns to the left are dominant for clockwise supine centrifugation (P<0.0001) and head turns to the right are dominant for counterclockwise supine centrifugation (P=0.0020), matching what is expected from previous studies. However, for prone centrifugation, head turns to the left are more intense than head turns to the right (P=0.0078), refuting the dominant direction hypothesis. The dominant end position effect is small in magnitude and cannot by itself explain the asymmetries. For every test condition, there is a dominant direction, but the dominant direction is not just a function of the HT and centrifuge rotation directions, instead it is also dependent on the subject's orientation on the centrifuge. An alternative perceived danger hypothesis that matches the data from all three experiments is proposed. Springer-Verlag, 2011 Cross-coupled stimulus nationallicence Asymmetry nationallicence Centrifugation nationallicence Artificial gravity nationallicence Vestibular nationallicence Coriolis nationallicence Mateus Jaime Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Mass. Ave., Room 37-219, 02139, Cambridge, MA, USA aut Cañizales Jorge Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Mass. Ave., Room 37-219, 02139, Cambridge, MA, USA aut Hearn Andrew School of Electrical Electronic and Mechanical Engineering, National University of Ireland, Dublin, Ireland aut Young Laurence Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Mass. Ave., Room 37-219, 02139, Cambridge, MA, USA aut Experimental Brain Research Springer-Verlag 209/4(2011-04-01), 561-569 0014-4819 209:4<561 2011 209 221 https://doi.org/10.1007/s00221-011-2588-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2588-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mateus Jaime Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Mass. Ave., Room 37-219, 02139, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Cañizales Jorge Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Mass. Ave., Room 37-219, 02139, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Hearn Andrew School of Electrical Electronic and Mechanical Engineering, National University of Ireland, Dublin, Ireland aut NATIONALLICENCE 700 1- Young Laurence Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Mass. Ave., Room 37-219, 02139, Cambridge, MA, USA aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 209/4(2011-04-01), 561-569 0014-4819 209:4<561 2011 209 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer