The abilities of man : their nature and measurement / by C. Spearman.

  • Charles Spearman
Date:
1927
Catalogue details

Licence: In copyright

Credit: The abilities of man : their nature and measurement / by C. Spearman. Source: Wellcome Collection.

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    sibility that either all, or else a large part, of the spatial cognition possesses over and above its g some overlap or group factor. Now, the more extreme of these last two views, namely, that all spatial cognition possesses a common group factor, has been submitted to trial by the spatial tests of McCrae. One of these was the Maze (Porteus). Another was Cube Construction, where the subject is supplied with blocks painted on some sides but not on others ; out of these he is required to construct larger blocks that also are painted on certain sides but not on others. A further test was the ' Goddard Formboard, which involves fitting a number of blocks as fast as possible each into an aperture made of corresponding dimensions. Yet another was the Dearborn Formboard, which differs from the foregoing in that two or more blocks must be fitted together into the same aperture, so that here skilful arrangement is needed in order to dis¬ cover some place for every block. There were three other tests, the Triangle, the Diagonal, and the Healy A ; these were very similar to the Formboards and extremely similar to one another ; each consisted in a most elementary sort of jigsaw puzzle ; four or five triangles or rectangles had to be fitted together into one or two apertures. The result of all this work, on applying the same criterion as before, is that no overlap or group factor becomes appre¬ ciable until we arrive at comparing together the three jig¬ saws which appear to be almost identical with each other. As for the remaining tests, not even the two Formboards manifest any such mutual overlap.1 1 Reference values are supplied by the known tests of Picture Com¬ pletion, Cube Imitation, and Substitution, none of which seems to involve essentially any relations of space. The spatial pools have been arranged so as not to include the correlations of the three jigsaws with one another; but as a matter of fact, even the inclusion of these values makes little difference in the result. Spacea. ga. Space& - - - - *311 -306 gb ----- .306 -262
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