Bauhaus-Universität Weimar

TIME OF SENSATION. 97 
B 
W 
L 
11.6 
4652 
13* 
16.7 
667.0 
12* 
17.2 
689.6 
II* 
79.2 
3168.1 
10** 
The white paper was always forty times as bright as 
the black. As the total illumination increased, the neces¬ 
sary rapidity of the rotation increased also, but far more 
slowly. If we are justified in considering the time 
occupied by the black in passing a fixed point as repre¬ 
senting the lag, it is apparently less for the stronger 
(light. 
Thus far we have studied the latent time and the time 
of lag ;1 the full course of a sensation is, however, not 
Jyet determined. Let a sensation be produced by a 
stimulus of constant intensity ; does the sensation, after 
reaching its maximum, remain at a constant intensity ? 
In the first place, it will have been noticed in Fig. 9 
that the maximum is followed by a decrease which 
{apparently leaves the sensation at a constant intensity, 
as long as it is present. We have, however, reason to 
: believe that the intensity does not remain constant. It 
as long ago noticed that when a small black point on 
ivhite paper was observed from a certain distance, 
he point would be visible only at intervals. Similar 
>bservations were made on very weak noises (a watch 
ivrapped in layers of cloth), temperatures, smells, tastes, 
nd light pressures. 
The earliest measurements for sight were made for a 
ust visible grey ring on a white ground. The complete 
périment can be performed as follows : To pro- 
uce a grey ground of variable intensity a white and a 
1 Experiments with tones show a latent time of 17 vibrations 
.g., for a tone of 100 vibrations it is 172), and a lag of 6* to 40c 
lepending on pitch and intensity. 
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