The interpretation of handedness.

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Abstract
Experiments on 146 school children with Parson's manuscope (a device for determining native handedness by finding out which visual line is used in sighting); 62.3% of the cases were right-eyed, 28.8 left-eyed, 8.9 impartial-eyed. These percentages agree only roughly with Parson's: these results show that only 2.4% of the left-eyed are left-handed, while Parson's show 12.4%, and he found only 1.4% impartial-eyed subjects. An acuity test was given to 19 subjects, but no definite relation was found between acuity and eyedness. The manuscope test is criticized for inadequacy of directions, lack of provision for adequate control, questionable nature of the results for individual cases, etc. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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