Improvement of Smooth Pursuit Eye Movements after Cigarette Smoking in Chronic Schizophrenic Patients.
- Author:
Jong Hun KIM
- Publication Type:Original Article
- Keywords:
Cigarette smoking;
Nicotine;
SPEM (Smooth Pursuit Eye Movement);
Ln S/N;
Schizophrenia;
Alcoholism
- MeSH:
Alcoholics;
Alcoholism;
Eye Movements*;
Humans;
Inpatients;
Nicotine;
Pursuit, Smooth*;
Receptors, Nicotinic;
Schizophrenia;
Smoke;
Smoking*;
Tobacco Products*
- From:Journal of the Korean Society of Biological Psychiatry
1999;6(1):119-124
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
This study was done to examine whether cigarette smoking improved smooth pursuit eye movement(SPEM) abnormalities in chronic schizophrenic inpatients. Fifteen schizophrenic and twelve alcoholic subjects abstained from their usual cigarette smoking for a minimum of nine hours and their baseline performances during the constant velocity smooth pursuit tasks were assessed. Then, the subjects smoked as much as they desired in a 10 minutes period and were retested immediately after smoking and 15 minutes after smoking. Electrooculographic recordings during the eye movements were converted and saved as digitized files. Power spectral density curves and natural logarithm value of signal/noise(Ln S/N) ratios were computed from them. In the schizophrenic patients, Ln S/N ratios increased significantly immediately after smoking compared to baseline. But Ln S/N ratios showed no statistically significant changes after 15 minutes compared to baseline. In alcoholic subjects Ln S/N ratios showed no statistically significant changes immediately after smoking and after 15 minutes compare to baseline. In conclusion, SPEM was improved in schizophrenic patients immediately after smoking and we hypothesized that nicotinic receptor dysfunction maybe a candidate mechanism for smooth pursuit eye movement abnormalities in schizophrenia.
