Bauhaus-Universität Weimar

8 
Ishiro Miyake, 
The results show that the rhythmic movements regulated by auditory 
sensations are more regular than those regulated by visual sensations. It 
may be also noticed that most of the beats of the finger come be¬ 
fore the sounds and also before the flashes, but more often in the case of 
sounds. With the subject D the beats with sounds come before the 
signals 143 times out of 152, with the flashes 108 times out of 144. 
With the subject S all 150 beats with sounds came before the signals, 
with the flashes only 63 out of 152. This fact agrees with Johnson’s1 
experiments, in which it was observed that all his subjects anticipated 
the signals in beating time with the strokes of an electric sounder. 
B. Free rhythmic action. 
In regulated rhythmic action the sensations are produced by some ex¬ 
ternal means, and the length of the interval is beyond the control of 
the subject. In free rhythmic action these sensations are produced as 
the accompaniment or consequence of the movement, and the length of 
the interval depends on the speed of the movement as chosen by the sub¬ 
ject himself. 
The present experiments on free rhythmic action were carried on in 
the two different series of trials : ( 1 ) free rhythmic action with and 
without auditory sensations, and (2) free rhythmic action with and with¬ 
out visual sensations. 
i. Free rhythmic action with and without auditory sensations. 
The experiment consisted in tapping on a noiseless key. The small 
“ strap ’ ’ key used in this experiment was made of an elastic brass strip, B, 
46™" long and 9““ wide, mounted on a wooden block, E ; a brass stop, C, 
kept the free end of the spring from rising 
more than 4mm from the block. A slight 
pressure on the button, A, at the free end 
of the strap forced it nearer the block 
and broke its contact with the brass stop. 
Platinum points, D, were used to ensure 
good contact between the strap and the stop. 
The key was put in a rubber bag and packed in felt so that the sound 
was rendered absolutely inaudible ; the key was thus an absolutely noise¬ 
less one. The wires, F, G, projected from the bag. A spot on the sur¬ 
face of the rubber bag under which the button of the key was situated was 
marked with a sign. It indicated the point where the tapping was to be 
Fig. 2. 
1 Johnson, Researches in practice and habit, Stud. Yale Psych. Lab., 1898 VI 51.
        

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