Transient Deviation of Closed Eyes on Head Torsion
Velosity of Saccadic Deviation
1993 Volume 52 Issue 3 Pages 369-373
Details
1993 Volume 52 Issue 3 Pages 369-373
Electrooculographically, torsion of the head with closed eyes elicits a transient saccadic deviation (TSD) of about 26° directed to the head torsion.
The velocity of TSD was measured in active and passive head torsions and compared with the velocities of sacades between two targets with 10° and 20° visual angles in 11 normal adults (aged 25 to 49 years).
The mean velocities of TSDs in active and passive maneuvers were 130°/sec and 160°/sec, respectively not a significant difference. The maximum velocities of TSDs were similar to those of saccades shown with 10° visual angle (around 200°/sec). According to the confidence limit and frequency distribution of the velocities of TSDs, the minimum value was thought to be 100°/sec, below which it might suggest a lowered alertness of the parapontine reticular formation (P PRF).
In conclusion, the velocity of TSD may be a valuable indicator of the funct ion of PPRF.
