SCALP DISTRIBUTION OF MOVEMNT-ASSOCIATED CEREBRAL POTENTIALS PRECEDING VOLUNTARILY, SELF-PACED MOVEMENT
1986 年 35 巻 1 号 p. 11-21
詳細
1986 年 35 巻 1 号 p. 11-21
The view which movement-associated cerebral potentials preceding voluntarily, self-paced movement are recorded through the human scalp is well known at present. Then, it is the focus of the present study that what functional significance of each component is. However, the present study reports of N 1 potential constituting movement-associated cerebral potentials were almost based on data of right handedness. Therefore, the authors thought that only data obtained from right-handedness are inadequate because of elucidating in more detail functional significance.
The purpose of present study was intended to investigate functional significance of N 1 potential through the comparison between the distribution over the scalp of N 1 potential of right-handedness and left-handedness.
The following results were obtained;
1) The amplitude of N 1 potential preceding voluntary right hand movement in case of right-handedness showed predominantly high tendency at Cz, C3 and also, showed high tendency at Cz, C3 in case of left-handedness. But, N1 potential of left-handedness did not show more significant tendency at Cz, C3 than right-handedness in voluntary right movement.
2) The amplitude of N1 potential preceding voluntary left hand movement showed high tendency at Cz, C4 in case of right-handedness. But, in case of left-handedness, there were the cases that the amplitude of N1 potential showed high tendency at Cz, C4 and did not show.
3) The amplitude of N1 potential preceding voluntary bilateral simultaneous movement showed high tendency at Cz, C3 in case of righ-handedness and showed clear asymmetry. In case of left-handedness, there were two types of subjects who showed asymmetry and not.
From the results described above, the authors may conclude that the findings which N1 potential shows preponderance over the hemisphere contralateral to the moving limb are based persistently on data of right-handedness and would not be able to apply to data of left-handedness. However, the results of the present experiment were applied to subjects assessed by assesment criterion of dominant and none-dominant hand described in“EXPERIMENT METHOD”and there was the limit of the present experiment in the assessment method of dominant and none-dominant hand.
