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By Jules Davidoff

Transformations in visible Perception

summary: variations in visible conception

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1946), for some reason digitalis causes the individual object and not the whole world to appear coloured. Siegel and Arden say that there are two drugs which specifically affect colour-vision without seriously affecting other visual functioning. The first is Furaltadone (Altafur), an antibiotic, which caused a permanent colourloss in part of the retina to a patient given large doses. The second is Troxidone, an anticonvulsant drug used for petit mal epilepsy, which has a temporary effect. In both cases, however, the patients' major visual complaint was not the colour deficit, but an accompanying severe dazzle.

The adaptation could be due to mental compensation, or to a change in the felt position of the hand. However, active movement and feedback do seem to be important factors. Held et al. (1966) have shown that this feedback has to occur almost immediately to be effective. 3 seconds by using a video-tape recorder made active movement ineffective in producing adaptation. In another experiment, Held and Bossom (1961) found that wearing displacing prisms caused a misconception of the straight-ahead position.

The observer sat on a rotatable chair. After several attempts under these conditions, one group of observers put on the prisms and walked for an hour along an outdoor path. The observers in the other group each sat in a wheelchair and, while wearing the prisms, were pushed along the same path for the same length of time. After this, the judgements of the straightahead were changed for the active observer but not for the passive. It has been argued that there is nothing intrinsically important about active movement in producing adaptations: it can be thought of as just a much more efficient way of getting any change.

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