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Mikael Karlberg published a set of papers, combined in 1995 into a PhD thesis called The neck and human balance: a clinical and experimental approach to cervical vertigo.(university hospital of Lund) One hypotheses advanced is that sensory mismatch (between proprioceptors and balance organs) has the potential to produce dizziness (in the same way that it produced if the two balance organs have unequal function). Central to this hypotheses, from my understanding is the role of the muscle spindle, which are densely represented in cervical musculature. the two sets of sensory info come together anotomically inthe high cervical cord and I think from memory are usually equal and opposite - and so in normal circumstances cancel each other out essentially. From my own clinical experience (and work on a current doctoral thesis on balance after Traumatic Brain Injury), there is a subpopulation who experience dizziness, where other causes have been ruled out and who experience resolution of symptoms by treating postural asymmetries and factors that are resulting in 'hypertonic', for want of a better word, cervical musculature. subjectively, these people, when asked for accurate description of their dizziness experience rarely report classic rotational dizziness, but other forms of lightheadedness, environmental disorientation, rocking sensations, sensations of pulling and the like. I find it all very facinating! In message <[log in to unmask]>, John Willenbruch <[log in to unmask]> writes > >[ A MIME text / html part was included here. ] > -- Maggie Campbell Consultant Neurophysiotherapist [log in to unmask] +44 (0)114 268 6963 Sheffield UK