An experiment is described which investigated a kinaesthetic spatial aftereffect related to the wrist joint. A group of 24 subjects were required to point to ‘straightahead’ using first one wrist and then the other. This ‘two-handed successive settings’ procedure yielded a significant kinaesthetic spatial aftereffect of 4·69° per wrist (p < 0·001), a value very similar to that found by Empson and Frisby (1972) for ‘two-handed simultaneous settings’ (4·66° per wrist). The theoretical implications of this similarity are discussed in relation to the different demands made upon the subject during one- and two-handed pointing tasks.
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References
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