Abstract
Attention has been implicated in postural control and other tasks requiring sensory integration. The purpose of this study was to investigate the role of attention in sensory-motor processing of vestibular and combined visual–vestibular information during seated rotations using a dual-task interference approach. We hypothesized that auditory information processing would be influenced by concurrent visual-ocular, vestibulo-ocular, or combined visual-vestibulo-ocular processing. We further hypothesized that the effect would be greater in older subjects. Twenty older subjects (10 women, 10 men, 69.3±3.2 years) and 20 young subjects (10 women, 10 men, 23.5±2.9 years) were asked to perform information-processing tasks while they underwent several types of vestibular, visual–vestibular, and ocular motor paradigms. The information-processing tasks were: (1) an auditory simple reaction-time task (SRT), (2) an auditory go–no-go (disjunctive) reaction-time task (DRT), and (3) an auditory forced-choice task (CRT). The visual–vestibular-ocular motor conditions included: (1) no movement/darkness (NO), (2) no movement/fixation (FIX), (3) no movement/pursuit (P), (4) earth-vertical axis rotation (EVAR) in darkness, (5) EVAR with fixation (E-FIX), (6) off-vertical axis rotation (OVAR) in darkness, and (7) OVAR with fixation (O-FIX). Results showed that older subjects had longer reaction times for all combinations of stimulus condition and reaction-time task compared with young subjects. Compared with the NO baseline, reaction times during EVAR were longer for young and older subjects and during OVAR were longer for the young subjects. For FIX and P, the reaction times during P exceeded those during FIX and during NO for both groups. For E-FIX and O-FIX, reaction times did not differ from those during EVAR and OVAR. The interference with information processing by concurrent vestibular stimulation in the dark may be based upon cortical inhibition of auditory processes by vestibular stimulation. Eye movements induced by EVAR showed an increased phase lead during reaction-time tasks, suggesting altered vestibulo-ocular reflex (VOR) dynamics, possibly based on cerebellar-mediated changes in velocity storage. Since fixation of a head-fixed visual target did not add to the effect of rotation in the dark, a further implication of our results is that VOR-fixation while performing a concurrent information-processing task may be accomplished primarily by VOR suppression rather than by VOR cancellation.
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Abbreviations
- NO:
-
Stationary in darkness
- FIX:
-
Stationary while viewing a stationary target
- P:
-
Stationary while pursuing a moving target
- EVAR:
-
Earth-vertical axis rotation
- OVAR:
-
Off-vertical axis rotation
- EFIX:
-
Earth-vertical axis rotation while viewing a head-fixed visual target
- OFIX:
-
Off-vertical axis rotation while viewing a head-fixed visual target
- SRT:
-
Simple reaction-time task
- DRT:
-
Disjunctive reaction-time task
- CRT:
-
Choice reaction-time task
- VOR:
-
Vestibulo-ocular reflex
- Task:
-
Type of reaction-time task
- VVC:
-
Visual–vestibular condition
- Group:
-
Age group
- Block:
-
First or second repetition
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Acknowledgements
We wish to thank M. Talkowski, D. Ross, S. Gruss, A. Lieb, and T. Schumann for technical assistance, Professor John Durrant for help with the auditory stimuli, and Professor Allan Sampson for help with statistics. This work was supported by NIH grants AG10009, AG014116, and EY08098.
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Furman, J.M., Müller, M.L.T.M., Redfern, M.S. et al. Visual–vestibular stimulation interferes with information processing in young and older humans. Exp Brain Res 152, 383–392 (2003). https://doi.org/10.1007/s00221-003-1560-z
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DOI: https://doi.org/10.1007/s00221-003-1560-z