Fatigue and its effects upon control / by Isaac Emery Ash.

  • Ash, Isaac Emery.
Date:
1914
Catalogue details

Licence: Public Domain Mark

Credit: Fatigue and its effects upon control / by Isaac Emery Ash. Source: Wellcome Collection.

    54/80 page 38
    ge 38 FATIGUE AND ITS EFFECT UPON CONTROL TABLE V Rev. Rev. Before After Per Cent. Observer Date Figure (Sec.) (Sec.) Increase I.E, A. Dee. 4, 1911 9 Cube 1.90 2.22 + 17 I. E. A. Dec. 4, 1911 12 Pyramid 1.46 1.88 + 28 J.A.S8, Dee. 11, 1911 9 Cube Ah. 1.36 + 72 J.A, 8. Dee. 11, 1911 12 Pyramid .90 1.30 + 44 A.M. L. Dee. 27, 1911 9 Cube 1.31 2.65 + 102 A.M. L. Dee. 27, 1911 12 Pyramid .98 2.41 + 146 W. A.C. Dee. 28, 1911 9 Cube 2.25 4.00 + 77 W. A.C. Dee, 28, 1911 12 Pyramid 1.30 2.00 + 54 J. W. Dec. 29, 1911 9 Cube 1.08 2.00 + 85 J. W. Dec. 29, 1911 12 Pyramid 1.81 2.25. + 24 I. E. A. Jan, 3,1912 9 Cube 1.63 2.12 + 36 I. E. A. Jan. 3,1912 12 Pyramid 1.18 1.57 + 41 J.A.S. Jan. 10, 1912 9 Cube 88 1.32 + 50 D.S8. Jan. 13, 1912 9 Cube - 1.36 1.80 + 32 1B ies Jan. 13, 1912 12 Pyramid 1.70 1.86 + 9 VAC ee: Jan. 19, 1912 9 Cube 1.90 2.32: + 22 VisA A Jan. 19,1912 . 12 Pyramid 1.10 1.47 + 34 0. C. T. Jan, 20, 1912 9 Cube 1.88 2.37 + 26 Oa Jan. 20, 1912 12 Pyramid 1.36 2.00: + 47 Ji, A. 8. Jan, 29, 1912 9 Cube 74 1.14 + 54 J.A.S. Jan. 29, 1912 12 Pyramid .69 1.10 + 59 The work in the experiments given in Table VI. was the same as that in Table V.; but was continued for one and one half hours in- stead of one hour only. TABLE VI Rey. Rev. Before After Per Cent, Observer Date Figure (Sec.) (Sec.) Increase TERA. Jan. 8, 1912 9 Cube 17 2.59 + 52 W. A.C. Apr. 6, 1912 9 Cube 2.16 3.41 + 58 O. C. T. Mar. 30, 1912 9 Cube .80 1.21 + 51 O. C. T.2 Apr. 5,1912 9 Cube bal 1.45 + 104 The foregoing tables show that the average time required to re- verse the perspective of an ambiguous figure is decidedly longer after a period of intensive mental exertion than before, the increase in reversal time varying from 22 per cent. to 102 per cent. or an average of 52 per cent. for the cube in the one-hour experiments; and from 9 per cent. to 146 per cent. (average 48.6 per cent.) for the pyramid. In the experiments in which the work was continued for an hour and a half the increase in reversal time for the ‘‘after tests’’ over what it was for the ‘‘before tests’’ varied from 51 per cent. to 58 per cent. (average 53.6 per cent.). 2In the experiment of O. C. T., April 5, 1912, the work period was two hours instead of one and one half hours as in the other experiments in this table.
    digitised image 1
    digitised image 2
    digitised image 3