Antropomotoryka nr 55.indb - Akademia Wychowania Fizycznego w ...

Iosif M. Feigenberg, Wacław Petryński
Table 1. The sequence of A, B, C and D signals in the experiments with groups of consisting of four stimuli (experiment 3)
Sequence of stimuli B C A D C B D A A C B D
The position of a stimulus in general
sequence
The position of a stimulus in a
group of four
1 2 3 4 5 6 7 8 9 10 11 12
I II III IV I II III IV I II III IV
Experiment 4. The aim of this experiment was
determination why the reaction to stimulus anticipated
with higher probability is being performed quicker. At
first a sound signal was emitted and 1.5 s later – a light
stimulus, calling for swift movement of left or right hand.
The sound signal eliminated the temporal uncertainty,
but it remained the uncertainty whether the left or the
right hand will be used. In the first part of the experiment
the stimuli for both hands were shown randomly.
They prompted broad activation (pre-preparation) of
skeleto-muscular system of both hands. In Fig. 3 there
are shown the electromyographic (EMG) and galvanic
skin reactions (GSR) graphs recorded in the experiment.
It is to be seen the wide pre-preparation of the
muscles of both left and right hand.
Then the stimulus for only one, always the same
(left) hand was shown, and the pre-preparation became
more local nature (Fig. 4).
As seen in Figure 4, the sound signal brings about
activation of only left hand muscles. So, it was shown that
the more accurate probabilistic prognosis, the more local
and, consequently, more economic pre-preparation.
Experiment 5. The experiment has been aimed at
determination how important is the locality of pre-preparation.
The examinee had one or two mobile switches
(MS) in hands, whereas two stationary switches (SS)
were attached to the table.
In the first part of experiment the examinee had
one MS in one hand. After a stimulus presentation, he/
she should touch an appropriate SS, which were attached
close to each other at the same side of the hand
with the MS.
In the second part of the experiment the examinee
had two MS in both hands, whereas one SS was
placed to the left and the other to the right of the left
Figure 3. EMG and GSR reactions to warning signal (Attention!)
and releasing stimulus at the beginning of experiment
Figure 4. The sound signal “Attention!” warns that in short will be
emitted the light stimulus calling for response with the left hand
1 RT 1 = 311 ms
2
3
RT 2 = 332 ms
RT 3 = 362 ms
– Stationary switch – Mobile switch
Figure 5. The arrangement of three parts of experiment 5 [6]
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