Although radio transmission of analog signals has been known for over 100 yr., very few investigators have exploited this approach to the systematic study of overt human movement. The small number of known previous applications are critically reviewed and suggestions made regarding future possibilities. Now that micro-electronic transmitters are commonplace, the only major obstacle to future use of this technique seems to rest with the design of unobtrusive motion transducers which are parsimonious in the acquisition of relevant data.
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