What do I need to know about multisensory interactions?
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1 What do I need to know about multisensory interactions? Adolfo M. Bronstein Neuro-otology Unit Centre for Neuroscience Imperial College London
2 Cortex: Conscious Perception Vertigo Brainstem: III/IV/VI nerves- VOR Nystagmus & Oscillopsia Vest. Nuclei Brainstem - Autonomic centres Nausea, Sweating, Heart Pounding Spinal: Vestibular Spinal Tract Unsteadiness
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4 The Components of the Balance System Three inputs: Vestibular Visual Proprioceptive (+ cognition) Four outputs: Conscious perception Eye movements Body movements Autonomic (visceral)
5 An example of Vestibulo- Proprioceptive interaction: The COR
6 gain An example of proprioceptive cognitive interaction: Context dependent modulation of the COR Labyrinthine Defective Subjects (LDS) Whole body VOR Head re. Trunk Trunk re. Head (COR)
7 Visual interactions in balance control Visuo-vestibular interaction Visuo-proprioceptive interaction (postural) Visual input in vestibular compensation Visual dependency
8 Bus Bus
9 Visuo-Vestibular interaction: 1 st : VOR + OKN 2 nd : VOR Suppression
10 Visual input for the suppression of ocular instability (nystagmus)
11 Visual input for the supression of postural instability
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13 Fixating on an object in the foreground (parallax) can reverse the direction of visuo-postural sway - no trivial reflex!
14 Eye-in-head and head-on-trunk position is taken into account a function of ocular and cervical proprioceptors? Exp Brain Res. 1996;111:283-8.
15 Cognitive control: Action & Expectation
16 The concept of short and long latency loops Head-drop technique for vestibulo-spinal reflexes Release Sling Accelerometer Surface electrodes 10 cm
17 Head drop technique Passive drop: relax and let the head fall Active drop: relax but stop the drop as soon as you can
18 Normal head drop 160 ms R SCM, EMG Early act. P 66 ms 25ms 1 mv active passive Acceleration traces active passive 0.5 g Time (ms) Munchau et al, Brain, 2001
19 The Motor System and its Multiple Levels Birnbaumer 1991
20 Vestibular compensation
21 Factors delaying vestibular compensation Fluctuating vestibular disorder Additional disorder: CNS Peripheral nerve Cervical spine Visual Lack of mobility Drugs Psychosocial Visual dependence
22 The Concept of VISUAL DEPENDENCE in the normal population Witkin 1959
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25 Peripheral Vestibular Symptoms Vertigo and nausea Dizziness Motion intolerance: Head motion Visual motion
26 Peripheral Vestibular Symptoms Vertigo and nausea Dizziness Motion intolerance: Head motion Visual motion VISUAL VERTIGO
27 Dizziness worsened by visual stimulation One of the Underrated neuro-otological symptoms (Hoffman and Brookler 1978). Motorist's vestibular disorientation syndrome (Page and Gresty 1985). Space and motion discomfort (Jacob et al 1993). Visual vertigo syndrome (Bronstein 1995). Visual vestibular mismatch (Longridge et al 2002).
28 Visually disorienting surroundings: - Supermarkets, repetitive fences - Ironing striped shirts, drawing curtains - Disco lights, movies - Traffic, driving, crowds - Flowing rivers, clouds beware of panic attacks, agoraphobia and psychosomatic dizziness
29 Visual Vertigo Patients Postural Tests: static and dynamic visual stimuli Fastrack Fastrack
30 Q uotient Stabilising and Destabilising effects of Vision N orm al controls V isual Vertigo LD S EC / E O D isk / EO
31 Optokinetic treatment Eyetrek Optokinetic disc J Neurol. 2004;251: Optokinetic drum
32 Do I need posturography to see which patients have visual dependence? ---> NO! Talking to your patients is actually better Computerised Dynamic Posturography
33 What do I need to know about multisensory interactions? - Balance is a function of the brain, not the ear - The brain uses all possible sensory resources available for balance - Even the simplest head or body movements involve multiple sensory inputs - Any input may be missing or unreliable, both in health and disease but the brain will continue to balance you by means of: ---> sensory reweighting ---> central compensation - These processes are, to some extent, idiosyncratic (vary from person to person) - As clinicians we must be aware of these issues when treating our patients this is the basis of good, customised rehabilitation
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