TY - GEN
T1 - Pairing virtual reality with dynamic posturography serves to differentiate patients with visual vertigo
AU - Keshner, Emily A.
AU - Streepey, Jefferson
AU - Dhaher, Yasin
AU - Hain, Timothy C.
PY - 2006
Y1 - 2006
N2 - To determine if increased visual dependence can be quantified through its impact on automatic postural responses, we have measured the combined effect of transient optic flow in the pitch plane with platform rotations and translations on the latencies and magnitudes of postural response kinematics. Six healthy (29-31 yrs) and 4 visually sensitive (27-57 yrs) subjects stood on a platform that was rotated (6 deg of dorsiflexion at 30 deg/sec) or translated (5 cm at 5 deg/sec) for 200 ms. Subjects either had eyes closed or viewed an immersive, stereo, wide field of view virtual environment (scene) that moved in upward pitch at 5 velocities for a 200 ms period. Three 30 sec trials were presented for each visual condition. Kinematics were collected with a Motion Analysis system and angular displacement of head, trunk, and head with respect to trunk were calculated. EMG responses of 6 trunk and lower limb muscles were collected and latencies and magnitudes of responses determined for each trial. No effect of visual velocity was observed in the EMG response latencies and magnitudes. Large effects of visual field velocity were observed on the magnitudes of head angular displacement in each of the visually sensitive subjects with unique characteristics that can be related to their particular clinical history.
AB - To determine if increased visual dependence can be quantified through its impact on automatic postural responses, we have measured the combined effect of transient optic flow in the pitch plane with platform rotations and translations on the latencies and magnitudes of postural response kinematics. Six healthy (29-31 yrs) and 4 visually sensitive (27-57 yrs) subjects stood on a platform that was rotated (6 deg of dorsiflexion at 30 deg/sec) or translated (5 cm at 5 deg/sec) for 200 ms. Subjects either had eyes closed or viewed an immersive, stereo, wide field of view virtual environment (scene) that moved in upward pitch at 5 velocities for a 200 ms period. Three 30 sec trials were presented for each visual condition. Kinematics were collected with a Motion Analysis system and angular displacement of head, trunk, and head with respect to trunk were calculated. EMG responses of 6 trunk and lower limb muscles were collected and latencies and magnitudes of responses determined for each trial. No effect of visual velocity was observed in the EMG response latencies and magnitudes. Large effects of visual field velocity were observed on the magnitudes of head angular displacement in each of the visually sensitive subjects with unique characteristics that can be related to their particular clinical history.
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U2 - 10.1109/iwvr.2006.1707549
DO - 10.1109/iwvr.2006.1707549
M3 - Conference contribution
AN - SCOPUS:41649114985
SN - 1424402808
SN - 9781424402809
T3 - Fifth International Workshop on Virtual Rehabilitation, IWVR 2006
SP - 178
EP - 181
BT - Fifth International Workshop on Virtual Rehabilitation, IWVR 2006
PB - IEEE Computer Society
T2 - 5th International Workshop on Virtual Rehabilitation, IWVR 2006
Y2 - 29 August 2006 through 30 August 2006
ER -