Page:Popular Science Monthly Volume 41.djvu/656

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THE POPULAR SCIENCE MONTHLY.

mind, and it is essential to determine in what measure each appears in the general result.

If you hold out your arm nearly on a level with the shoulders and in line with them, you perceive at once that movements of PSM V41 D656 Counting metronome 90 seconds trace of right and left hands.jpgFig. 4. Counting Metronome. Right hand holds pencil, left hand holds record; time of each, 90 seconds. Facing . Upper line, standing; lower line, sitting. the hand to the front are much more readily made than to the rear, and movements toward the body more readily than those away from the body; the tendency of the hand is to move along a circle of which the shoulder is the center. What we require is a position in which movements in any direction are as readily made as in any other; and this may be approximated, though only approximated, by holding the hand at an angle of about 45° with the line joining the shoulders, and with the elbow bent at an angle of about 120°; this position[1] is

PSM V41 D656 Automatograph traces of thoughts by metronome timing.jpg
Fig. 5.—Thinking of a Building. Facing ; standing. Right hand holds pencil, left hand holds record; time of each, 60 seconds. I, ; II, ; shows respiration.   Fig. 6. Counting Metronome. Right hand holds pencil, left hand holds record. From A to B, ; from B to C, ; from C to D, ; from D to E, ; standing; each part, 45 seconds.

recommended for the normal tests. The usual result is a movement toward the object of attention; but when that is to the rear, this tendency is sometimes outweighed by the natural tendency


  1. In one series we were able to measure the extent of movements in various directions, and found half again as much movement toward the front as toward the rear, and a third again as much toward as away from the body.